When I last posted about my work on the Minimum Ninja, you saw a photo of a damaged and worn out aftermarket exhaust header. When my wife bought this as an abandoned bike from the back lot of a Kawasaki dealer for a c-note a few years ago, it had the Yoshi pipe on it, so I had to  buy a stock head pipe. If your Ninja has the stock mufflers you don’t have to do all of this work, just figure out where to cut them off, put the right adapters in the new muffler, make some brackets and go. Not being that fortunate I had to do a little more work, not a problem for me tinkering on a motorcycle is as much fun as riding one. I started with a piece of 1 1/4″ water pipe,way bigger than the exhaust pipe but a good enough match to the size of the flange around the pipe to be easy to weld.

1 1/4 inch water pipe nipple

So I stuck it in my handy dandy pipe bender and bent it to the desired angle. Please note that pipe benders like this will NOT bend thin wall tubing without crushing it, they are meant to bend schedule 40 steel pipe or very thick walled DOM tubing.

An inexpensive pipe bender

After bending and cutting it to the right length grind one down enough to slip into the new muffler. And absolutely grind away all of the galvanizing from the area to be welded. The fumes given of by burning galvanizing are very dangerous. Use all necessary precautions. I would have used black pipe but the hardware store was closed and Lowes did not carry it in this size.

one is done and one more to go

Then I mocked it all up on the bike and tack welded the adapters to the head pipes.

Mocked up for tack weld

After that I pulled everything back off and seal welded the pipes together, cleaned off the scale and shot the pipes with a coat of high heat paint

tack welding completed

pipes seal welded & painted

Then I wrapped the entire head pipe with header wrap and reinstalled everything.

Head pipe wrapped with 2″ wide fiberglass wrap

I did take the centerstand off, 😦 it just did not work with the new pipes. Besides now I have a motorcycle lift table when I need to work on it now.

Next time I’ll show you how I lined the fuel tank with tank Kreem. An oil & plug change how to is in the works too.

Peace Y’all

P.S. This thing sounds really good now and is not nearly as loud as it was.