Is A Lithium Motorcycle Battery For You

Lithium Motorcycle Battery Pros & Cons

If you have not heard the buzz about lithium batteries for motorcycles then you have probably been hiding under a rock somewhere. There are many different brands available, and although prices have dropped some you may have noticed that they command a premium price. The question for most people is lithium motorcycle battery worth it? Most of the time yes, but sometimes the answer is no.

Of course there are a number of advantages and some disadvantages of lithium batteries in general. The single biggest advantage they have for the motorcycle restorer or customizer is that they contain no acid. There’s nothing worse than to have your battery burp a little acid out through the overflow tube and dribble it all over you freshly restored paint & chrome. Even if you carefully route the vent tube the acid still seems to corrode the battery box, frame etc.

Figure 1 Battery acid damage to a Gold Wing

<lithium motorcycle battery>

For the collector & show bike enthusiast who does not ride their motorcycles very often, a lithium battery has a very slow self-discharge rate. Especially on older motorcycles that have zero current draw when the key is switched off a fully charged lithium ion battery will usually maintain enough current to start the motorcycle for up to a year. Please note that it is recommended by all manufacturers that you disconnect and remove the battery for storage. If your motorcycle has any current drawing accessories such as a clock or an alarm system the battery must be checked & charged on a regular basis if you plan to leave it connected to your motorcycle.

In racing or other high performance applications lithium ion batteries have the advantage of weighing much less any other currently available battery configuration with equivalent specifications. I cannot recommend them for total loss ignition systems on race machines unless you are willing to be extremely diligent about checking and recharging them, and you accept the fact that this is basically a non-warrantied experimental use in the eyes of the manufacturers. If your racer has a charging system that meets the minimum charging requirements of your battery then you should not continue to handicap yourself by running a heavy lead acid battery.

Customizers love these batteries because they can be installed in any position even upside down. There are a few different from factors, most appear similar to a standard battery, but there are a few oddly shaped batteries available. Li-ion batteries are much smaller & lighter making them much easier to hide in café racer bum stops or under seat trays.

Figure 2 Conventional and Shorai Lithium Gold Wing batteries for comparison

<lithium motorcycle battery>

Warranties are usually better on these batteries running on average 3 years from most suppliers if they are installed in a factory recommended vehicle with a good functional charging system.

This leads to the biggest caveat of them all. Your motorcycle or other powersports vehicle must have a charging system capable of maintaining a steady charging rate of 13.6-14.4 volts during operation. If you have an older motorcycle that has a marginal charging system that is not capable of maintaining this charging rate and you want to run this type of battery some charging system upgrades will be needed. If yours is a fully functional mint condition classic motorcycle with all original parts, I personally would not change it just to run a li-ion battery. For one that is a frequent driver, or just needs a new charging system, look at some of the aftermarket upgrades available, it might be worth your while upgrade your charging system even if you don’t choose a Li-ion battery.

With proper precautions (see the manufacturer’s instructions) these batteries can handle some water spray or a very brief dunking, if you frequently run long deep water crossings on your dirt bike or take your atv and drive it around in the water with nothing but the snorkel sticking up above the water then these batteries are not for you.

Another factor to consider for some is that if something goes wrong & your battery goes dead away from home it can’t be jump started. Once discharged below a certain point these batteries have to be charged back up with the manufacture’s recommended charger, or you risk damaging the battery. So if you’re the life of the party & plan to use the stereo system in your Gold Wing to provide music for the whole campground until late at night & then get your buddy to give you jump start the following morning so you can get home then you shouldn’t even consider a lithium battery.

Since this was published in the Vintage Japanese Motorcycle magazine I must note that if you need a six volt battery, at this time the only manufacturer offering a six volt lithium motorcycle battery is Shorai.

Cold weather operation is a little different & takes some getting used to. When the temperature drops below freezing a li-ion has very different operational characteristics. They actually require a bit of a warming up period to deliver full voltage. For my own personal driver, a 1980 Honda CB650, when the temperatures are at or below freezing I will switch the key on and make sure the headlight is on high beam for about 30 seconds before hitting the starter button. If the engine turns too slowly to start I let go of the button and wait a few more seconds at which point the battery is fully warmed up and will spin the starter normally.  It’s just a little thing & I realize most people are not masochist enough to ride a motorcycle in the freezing cold if they have a car, but it is a difference in the behavior of lithium & lead acid batteries that you should be aware of.

To me the advantages of the lithium motorcycle battery outweigh the disadvantages and I hope that this gives you enough information to help you make an informed decision about whether or not you want to purchase one.

This article originally appeared in the Vintage Japanese Motorcycle Magazine in 2015. To learn how to join the club and receive this fine publication 6 times a year visit http://www.vjmc.org

Disclaimer; Motopsyco is an authorized Shorai battery dealer and will be more than happy to help you with selection of your new battery, so if you can’t figure out which one you need from this battery finder link, feel free to contact me by email at motopsyco@motopsyco.com.

 

Perfect 1975 Kawasaki Z1B 900

Before it became the Perfect 1975 Kawasaki Z1B 900

Take a good long look at the bike in this picture. This particular machine is now the most perfect 1975 Kawasaki Z1B 900 on the planet right now. But before you scroll down just take a minute to stare at this first picture and just imagine the work it took to make it that way.

Perfect 1975 Kawasaki Z1B before

This motorcycle belongs to a gentleman from North Carolina named Mike. It was a long term labor of love for him to perform the ground up restoration you are about to see below. It has taken best Kawasaki honors at several shows, and at the Destination Eustis show this year his effort was rewarded with the best of show trophy.

Now Mike has kept a notebook full of pictures detailing this restoration and displays it with the motorcycle at shows. It’s really very educational & inspiring to look at his pictures, and just get a small glimpse of the effort it took him to turn this particular sow’s ear into the most exquisite silk purse it is today.

I present to you the Perfect 1975 Kawasaki Z1B 900

Let’s start with a left front view. All of the pictures in this post are large so it may be a little slower to load but trust me it is worth it.

Perfect 1975 Kawasaki Z1B 900 left front

These were taken the Sunday morning after the show when a lot of the bikes had already left the exhibition hall. Rather than stage it somewhere else I decided to get a bunch of pictures right where it was at.

Perfect 1975 Kawasaki Z1B 900 head on

Perfect 1975 Kawasaki Z1B 900 right rear

I’d be willing to lick the bottom of this engine but for the fear that my tongue would get it dirty…

Perfect 1975 Kawasaki Z1B 900 bottom of engine

Kawasaki completely redefined the parameters of motorcycle performance when they created the DOHC 903 engine, and this one has looks to match.

Perfect 1975 Kawasaki Z1B 900 picture of engine

Here are a few more details for you to check out, enjoy!

Perfect 1975 Kawasaki Z1B 900 sidecover

Perfect 1975 Kawasaki Z1B 900 top view

Perfect 1975 Kawasaki Z1B 900 gauges

“if I could turn back time…”

Perfect 1975 Kawasaki Z1B 900 front hub

Perfect 1975 Kawasaki Z1B 900 front of engine

Perfect 1975 Kawasaki Z1B 900 front details

Perfect 1975 Kawasaki Z1B 900 left profile

This next picture is my favorite of this batch, it captures the overall beauty of this motorcycle better than any other picture in this group.

Perfect 1975 Kawasaki Z1B 900 portriat

I must confess to teasing Mike about not riding this one, but to tell the truth after all of the hard work he’s put into this one, who can really blame him for wanting to keep it perfect for as long as possible? He is a true fan of the original Kawasaki 900 and keeps another one in his stable for riding, so don’t even dare think of him as just another poser with a show boat because he’s not. If this beauty were mine & I had put so much work into it I’d be just like him.

Perfect 1975 Kawasaki Z1B 900 Best of Show

 

Destination Eustis 2016 Motorcycle Show

Friday at the Destination Eustis 2016 Motorcycle Show

There wasn’t really a lot going on yet when I rolled into the Destination Eustis 2016 Motorcycle Show early on Friday March 4th. So I went ahead and set up my base camp for the weekend. To stretch my budget this year, instead of staying in a hotel I decided to sleep on an air mattress in the back of the enclosed trailer. This actually made a decent camping arrangement as a simple tent heater kept it nice and cozy on the cool early spring nights.

Motopsyco's camp @ Destination Eustis 2016 Motorcycle Show

Afterwards I went digging around the swap meet just to see what was there. I didn’t take as many pictures this year because I had an actual shopping list of parts that are needed for two very different bikes, one a 45 cubic inch Flathead Harley and the other a Honda CT70 Mini Trail. Didn’t find much for the mini but there were a couple of vendors that had some good deals on parts for the Flattie.

<harley flathead battery boxes>

<flathead & wla handlebars>

One of the absolute coolest things there was this little Model T replica for sale. The seller drove it around all over the place, and I hope some happy person took it home.

Mini Model T at Destination Eustis 2016 Motorcycle Show

Other than a little shopping I just hung around the main exhibition hall and offered my meager assistance to the really hard working folks in the VJMC who were getting everything ready for the show on Saturday. Once darkness had fallen and supper was over it was time to retire to my little campsite and knock back a brew before turning in.

Saturday at the Destination Eustis 2016 Motorcycle Show

<campfire coffee>

Fresh perked coffee early in the morning, sitting in a chair outside while cooking breakfast over a camp stove. The only way it could have gotten any better would be if my lovely partner had been there with me, but alas she had to work.

<cb450 police & qa50>

After making myself reasonably presentable it was time to head over to the main hall again and watch as the neat old bikes filed in to register for the show. Rather than trying to post them individually I put a few of them in a slideshow for you.

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There were of course a few extra special bikes that really stood out and demonstrated that even though this may be one of the smaller “Bike Week” events it attracts some really high caliber machinery.

First up is an ultra rare Flying Merkel, who doesn’t enjoy seeing an old timer like this in good running order?

Flying merkel>

There have been a lot of custom cafe racer or muscle-bike style custom Goldwings showing up on the internet and it was great to see this wild ‘Wing show up to take home 1st place in the custom class.

Custom Goldwing Destination Eustis 2016 Motorcycle Show

No vintage motorcycle show is complete without at least one classic American racer, and the stunning Indian flat tracker fits the bill perfectly.

<antique indian racer>

The Best Of Show award went to my friend Mike, who brought this absolutely immaculate 1975 Kawasaki Z1B. He restored this bike himself from a rusty derelict. Look for more pictures of this one in the next week or two.

<1975 Kawasaki Z1B>

One of the best things about going to a VJMC organized show is the fact that the judging is done by audience voting. This makes results almost completely unpredictable, and does away the bullshit & hurt feelings that result from selection by a panel of judges. I’d also like to acknowledge the hard work of the Vintage Motorcycle Alliance, they run the swap meet and set up the vendor areas and without them and the Vintage Japanese Motorcycle Club, this event would not be what it is.

Click here to learn more about the Vintage Motorcycle Alliance

Click here to learn more about the Vintage Japanese Motorcycle Club

Until next time, Peace Y’all

 

 

Cheap Fake Cad Plating & ABS Plastic Repair

 

There are two things that are commonly found when working on old motorcycles, one is cadmium plated parts that are faded, rusted or discolored somehow, and the other is broken or cracked mounting tabs on plastic parts such as air boxes or side covers. Today we’ll learn how to do a reasonably good job of creating cheap fake cad plating with spray paint. Then we will tackle a minor repair of some ABS plastic parts. Most of the black plastic parts on motorcycles are ABS and on some such as early sport bikes such as EX250 or 500 Ninjas the bodywork is also.

Cheap Fake Cad Plating

Passport steering lock to get cheap fake cad plating

Let’s start with this steering lock that goes on my 1982 Honda C70. In the picture it doesn’t look too terrible, but this was after washing it in the parts washer with a Scotchbrite pad to get rid of some light rust.

Duplicolor adhesion promoter

Once it was dry I taped off the key slot and sprayed on a couple of coats of adhesion promoter.

chrome spray paint for cheap fake cad plating

After giving the adhesion promoter about 8-10 minutes to dry I gave the part a couple of coats of metallic “chrome” paint. This paint doesn’t really look like chrome but it really is a very bright silver.

Passport lock with chrome paint

After allowing the chrome paint to dry thoroughly, take a can of the metallic “gold” spray paint and from 18-20 inches away lightly fog the gold paint over the chrome. Just do one or two light coats. the idea is to lightly tint the part with gold but not to completely cover up the chrome.

gold metallic spray paint for cheap fake cad plating

It’s really best to do this in a well lit place so that you can see when there’s enough gold on the part and stop spraying it.

how to cheap fake cad plating

Here you can see my cheap fake cad plating next to one of the well sheltered original cadmium plated brackets from this same motorcycle. Naturally if you plan on having a 100 point national show winning motorcycle, real cad plating is the only way to go, but for your average rider or local bike night hero this is a nice inexpensive way to get a clean authentic look to parts that should look cad plated.

ABS Plastic Repair

A major source of aggravation are cracks in plastic parts and or mounting tabs broken off of them. But since since a lot of these plastic parts are made of the same ABS material as sewer & drain pipe there really is quite a simple solution. Glue them back together with common ABS cement that you can find at any local hardware store. The air box on this little C70 that I’m working on had been reinstalled at some point in the past without the metal spacers that are normally used to secure such parts to the metal frame without damaging it. The result was that one mounting tab was split & the other one was broken completely off.

fix motorcycle abs plastic parts

To repair the cracked side was simple enough, it jut needed cleaning up and having plenty of glue applied. For the other side that was completely broken out I put a standoff with a washer in the hole & gave it a good coat of cement, permanently attaching it to the air box. You can also buy ABS plastic sheet & use that to fabricate repair patches, replacement tabs & even custom parts that can be glued together using ABS pipe cement. Once you are done & the glue is dry it can be filed, sanded or even painted over just like any normal plastic.

Hopefully these two tips about cheap fake cad plating & abs plastic repair will help someone out, until next time.

Peace Y’all

 

 

Honda C70 Passport Restoration Part 1

Honda C70 Passport Restoration The Beginning

It all started out innocently enough with me picking up this little diamond in the rough. It obviously hadn’t run in a while and was very weather beaten. Initially I had no plans to do a complete Honda C70 Passport Restoration but you know how these things tend to snowball.

Dilapidated Honda C70

With a little help from my beautiful assistant it was soon running like a top.

Pretty lady spinning wrenches Honda C70 Passport Restoration

Initially I had no plans to do a complete Honda C70 Passport Restoration but you know how these things tend to snowball. Let me go ahead and be perfectly clear from the start, this is not intended to be a 100 point purely stock restoration. The goal here is to produce a very nice looking scooter to use for transportation at larger events like the Barber Vintage Motorsports Festival or the Destination Eustis Motorcycle show & swap meet.

After cleaning the carbs, adjusting the valves, changing the oil etc. I took the little thing out for few a test runs and am very pleased with how it runs & drives despite the fact that it had dry rotted and mismatched tires on it. So I started ordering the pieces it was missing such as the chain cases. Where the original equipment stuff is available for a reasonable price I’ll use that, when not there are plenty of reproduction parts available on the internet from Thailand and other countries. The quality of the reproduction parts is all over the map, so be prepared to ship some things back or tweak them to get everything working and looking good.

C70 reproduction Chain case

Then one evening a few days ago I lit a fire in the heater and started pulling it apart.

In My Happy Place

One of my favorite things to do as I am pulling a bike apart is to take lots of pictures. Thanks to digital photography it is now easily affordable to document every nut & bolt that you remove if you want to. On older bikes like this that use a lot of bullet connectors it is a great idea record every single wiring connection. Sometimes there are different colored wires that attach to each other that you may not remember otherwise. There are also incorrect wiring diagrams in some service manuals for some machines so every bit of extra information helps. Plus when you put it all back together & it works right the first time, your friends will think you’re a genius!

Yes I really do use Shorai batteries for damn near everything, They’re especially great for motorcycle collectors who often let their bikes sit without running and there’s no acid to boil over and ruin your shiny new paint job. Last year I wrote an article for the Vintage Japanese Motorcycle Magazine detailing the pros & cons of using lithium batteries in motorcycles, that article will probably show up here on the blog in the near future.

Motopsyco sandblasting a Honda Passport C70 Restoration

Since there was quite a but of surface rust & some light pitting the frame & forks were taken down to bare metal by sandblasting. Since I did not remove the fork from the frame I very carefully sealed off the bearing cup areas to keep the sand out.

zinc dichromate primer

After it was completely stripped, it received a few coats of zinc phosphate primer for maximum rust protection.

Ford blue engine paint

Since this is to be a parts runner and not a show bike instead of buying an expensive urethane paint in the original Honda Angel Blue I opted for 3 cans of Duplicolor ceramic engine paint in Ford blue. These paints are very durable & hold up quite well to gas and oil spillage.

Honda C70 Passport Restoration Starting the Assembly

Motopsyco Honda Passport C70 restoration

After getting all of the little bits painted it was time to move on to reassembly.

Wiring Honda Passport C70 restoration

All of those pictures I’ve taken are really coming in handy to reroute the wiring harness.

fake cad plate

Figured out how to create a reasonable looking fake cadmium plate using spray paint, will do a step by step post at a later date.

engine kill switch

The switch gear was scrubbed clean and the taped off so the kill switch and starter button could be painted red again. All of the black buttons & switches still looked good so those were left alone.

rebuilding my C70

I had stopped at this point to do some much needed body repairs to my truck and should be getting back to it next week, so be sure to subscribe below to receive regular updates.

1957 Zundapp Junkyard Dog

Here’s some real motor archeology for you, a 1957 Zundapp. I am fairly certain that it is a Super Sabre, feel free to let me know if I’m wrong.

Zundapp Motorcycles were built in Germany beginning in  1919. The KS750 sidecar motorcycle produced for military use was probably their most well known product, but they also made sporting two stroke singles like this one and a wide variety of scooters as well. They had a reputation for being solid well built machines.

<1957 Zundapp>

1957 Zundapp

Shame I couldn’t have gotten hold of it 20 or 30 years ago.

<1957 Zundapp>

<1957 Zundapp speedo>

<1957 Zundapp front hub>

Got Rust?

The cylinder head doesn’t have any broken fins, wonder what it looks like on the inside?

<1957 Zundapp engine>

It’s a shame to see such a fine piece of German engineering in this condition.

<1957 Zundapp tank badge>

<1957 Zundapp>

The original ID tag is still in place behind the headlamp.

<1957 Zundapp>

At this point it is highly unlikely that I will attempt to restore this motorcycle. The plan is to carefully dissect the cadaver to see if there are still any parts that would be of any use to anyone who has one of these rare old motorcycles.

<1957 Zundapp>

1957 Zundapp Super Sabre

If this were a typical Craigslist ad here is where it would say, “tires still have plenty of tread left.”
<1957 Super Sabre>

If you would like to find out more about these motorcycles, or if you are just curious to see what this pile of junk used to look like visit the Zundapp Fool website by clicking here.

Peace Y’all

2015 VJMC National Rally Day 1

Today was the first day of the 2015 VJMC National Rally

image

Here are a few more pictures from the first day’s action .

image

I actually feel bad about loading the Suburban Assault Scrambler onto  to a trailer for this short little trip, but I wanted to take both bikes.

image

image

This blue and white Suzuki water buffalo is terrific looking.

image

Another blue and white Suzuki.

image

image

A Honda Grom and a CB 1100 parked outside of the Convention Center.

image

A raffle bike from the  Cincinnati group.

image

It just wouldn’t be a vintage motorcycle rally without a Honda ST90.

image

A beautiful Yamaha but check out the odometer below.

image

Before I sign off for the day, I  just have to include a picture of my Suzuki TS185 sitting inside the convention center with all the pretty show bikes.

image

Peace y’all.

2015 Carolina Classic Motorcycle Show

<Carolina Classic Motorcycle Show>

Carolina Classic Motorcycle Show registration tent

The Triad Vintage Motorcycle club hosted their 9th annual Carolina Classic Motorcycle Show on May 2nd 2015. Mrs. Finch & I saddled up the old Suburban Assault Scrambler and rolled out of our driveway headed toward the N.C. Transportation Museum in Spencer N.C. Rather than running up on the super boring slab I plotted a course to Spencer that involved rolling up to Chesterfield, S.C. and picking up Highway 742 and rolling into N.C. and picking up U.S. 52 for the rest of the way into the Show.

Let me get started by praising the venue, the Transportation Museum is a very nicely laid out train museum with great parking for visitors and a really nice grassy area with paved pathways for the show grounds. Although you will see glimpses of it in the pictures the best way to see how nice of a facility they have is to watch this little video clip I made riding into the museum. Some of the show bikes are also featured in the video as well.

I have decided to make this mostly a pictorial post with random comments. There was something for everyone here.

<1929 Indian Scout>

Lets go ahead and start out with this 1929 Indian Scout!

<29 Indian Scout engine>

Of course while our baby boomer parents have driven the collectible motorcycle market so far, I predict that as those of us in Generation X take over you will see the motorcycles that we lusted over in our younger days such as this pristine Suzuki Katana experience a surge in value & collect-ability.

<1st Gen Suzuki Katana>

<81 82 83 Suzuki Katana>

No motorcycle show is complete without a couple of nice Harleys

<old shovelhead Harley>

The old FLH was nice but I really loved this Evel Knievel replica Sportster.

<Evel Kneivel replica sportster>

Is that cool or what?

Some really nice British iron was there also.

<triumph tr6>

<Norton Commando 750>

<77 Triumph Bonneville sidecar>

 

Some off road racers were being shown as well.

<CR Honda & YZ Yamaha>

<restored Suzuki TS185>

The cafe racer crowd was well represented.

<classic cafe racers>

<80 CB650 Cafe Racer>

A very tasty looking Yamaha RZ350 Kenny Roberts signature edition.

<RZ350 Kenny Roberts>

<2 stroke Yamaha>

For once mine was not the only rat bike in the show, check out this XS400 chopper.

<rat yamaha chopper>

Great looking patina on this old Norton

<Norton Rat>

<Norton Rat>

Another Gen X favorite we couldn’t afford when we were 19, the Honda Interceptor

<Honda VFR1000 Interceptor>

The trains rolling in and out during the day greatly added to the atmosphere of the event.

<historic transportation>

It’s time for me to stop writing now & let the pictures do the rest of the talking…

<Yamaha Seca Turbo>

Yamaha Seca Turbo

<Sears Puch 250 Twingle>

Sears Puch 250 Twingle

<1966 Honda Super 90>

1966 Honda Super 90

<the Gold Wings>

To see more visit the Triad Classic Motorcycle Club Facebook page

Peace Y’all

 

 

’58 Cushman Eagle For Sale

A friend of mine has this finely restored 1958 Cushman Eagle for sale. In 2014 he did a complete nut & bolt restoration on the thing. All of the tins have been repainted, everything else that isn’t chromed or polished has been powder-coated. The engine was overhauled and received a new piston, rings, & camshaft in the process.

<Cushman Eagle for sale>

You have to see this one in person, and hear it running to believe it. Did I tell you about the seat? It does have one very nice custom upgrade, an alligator hide seat cover.

<Cushman Eagle Alligator Seat>

The price for this vintage piece of all American Coolness? $4500.00 USD picked up in Waterloo S.C. If you need to have it shipped that will be your responsibility to arrange for shipping & crating. So if you are interested call Larry Rossi at 864 677 5252 between the hours of 8:00 am & 9:00 pm Eastern Standard Time.

More About Vintage Motorcycle Drum Brakes

In my recent post Twin Leading Shoe Drum Brakes, I went over the basics of servicing a set of front brakes from an 81 Honda CM400E, & while I feel that it was a decent article from a how to standpoint, it was pointed out to me that someone who was completely new to the world of vintage motorcycle or do it yourself mechanics might not fully understand that I was trying to convey so I thought that it would be a good idea to go over the basics of the different type of vintage motorcycle drum brakes. For the purpose of this we will examine internal expanding shoe brakes, there are some ancient motorcycles & some minibikes that use a completely different drum brake style with an external brake band around the outside of the drum and I’m not going into that here unless you give me evidence of overwhelming popular need for explanations of external band brakes. Below you will find a few illustrations along with some brief explanations of mechanically actuated single leading shoe & twin leading shoe vintage motorcycle brakes. Just for grins I’ll show you an exploded illustration of a four leading shoe drum brake at the end of this post.

First let’s examine the single leading shoe drum brake. This is the type that you are most likely to encounter on motorcycles and atvs that utilize drum brakes at one end or the other. In fact there are still some lower end bikes that still use this system today. It is simple & it works.

<single leading shoe brake motopsyco.com>

When the brake arm is moved the brake cam pivots pressing the shoes into the drum generating friction to stop the wheel from turning. You may have noticed that I have the shoes marked leading and trailing and here is why. with the drum rotating in a clockwise direction the bottom shoe is pushed away from the brake cam by the rotating drum thus forcing it against the brake pivot post and the drum with greater force. The front or leading edge of the brake shoe is the first part of the shoe that the rotating drum passes over as it turns whereas the trailing edge is the last edge of the friction pad in the path of drum rotation. The top shoe in this illustration is labeled the trailing shoe because the trailing edge of the shoe is forced up into the drum first. Because it is not being pushed into a fixed pivot point by the rotation of the drum, the force generated tends to push it back towards the brake cam instead of  pushing it more tightly into the drum. This means that the trailing shoe generates less stopping force than the leading shoe. There are a few advantages to this design with simplicity & reliability being at the top of the list. Another huge advantage to this design is that when you reverse the direction of wheel rotation, the trailing shoe becomes the leading shoe & the leading shoe becomes the trailing shoe. Why is this an advantage you may ask? Simple you get equal braking force whether you are going forward or reverse. While this is not that big a deal on a motorcycle it’s very important on vehicles such as atvs, tractors etc. that have reverse gears and travel backwards under power.

Up next let me throw up an illustration that I created of a simple twin leading shoe brake.

<TLS brakes illustrated motopsyco.com>

You will notice that there are still two brake shoes inside the drum but now there are two brake cams, two pivot posts, & two brake actuating arms joined together with a linkage. When the brake arms are moved it raising the leading edge of both shoes into the brake drum. Remember the advantages that the leading brake shoe has in stopping force that I told you about earlier? Now both brakes shoes are leading shoes giving you the maximum amount of friction possible from a drum brake design. This is the advantage to this design, increased stopping power. The disadvantages are that it is slightly more complicated and that it requires careful adjustment of the brake arm linkage to ensure that both shoes contact the drum at the same time. If the shoes do not open at an equal rate then only one of them will touch the drum under use giving you even less stopping power than a single leading shoe brake system. Also if you reverse the rotation of the wheel the twin leading shoes become twin trailing shoes, giving a reduced stopping power in reverse. On a motorcycle this doesn’t really matter though.

In the blog post about twin leading shoe drum brake I stated that they were the ultimate development in vintage motorcycle drum brakes, well that is almost true. There is a system that is capable of generating even more stopping force than that, the four leading shoe drum brake that was used in some exotic racing machinery. I shall not go into a huge amount of detail here except to say it is basically a pair of twin leading shoe systems mounted back to back on a common hub. I cribbed the image below from TheVincent.com.

<4 leading shoe motorcycle brakes>

If you are fortunate enough to own such a fine machine as an antique, Vincent, Brough, or MV Augusta racebike that uses 4 leading shoe brakes and you (or your staff mechanic) are not able to get it sorted properly, then load it into the enclosed trailer that you keep attached to your Land Rover, or Cayenne and have your butler deliver it to me along with a sackful of large unmarked bills and I will be glad to set it up for you, including a small amount of testing at a local track to make sure they are operating correctly.