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2-stroke pipe repair

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So I have been working on my project bike and the pipe that was on it was trashed. A friend gave me a stock pipe with a few dents and I decided to try and fix the dents. A friend made me a special tool to seal the cylinder end of the pipe and i got a plug from the plumbing store for the other end. 50psi and the oxy/acetylene torch, magic. I did scare the shit out of myself when the little plug came out once. Still can't find it. Made up another one and finished.

http://i1107.photobucket.com/albums/h387/Jlow81/4b105ad5.jpg

http://i1107.photobucket.com/albums/h387/Jlow81/b5385f71.jpg

http://i1107.photobucket.com/albums/h387/Jlow81/366fa590.jpg

http://i1107.photobucket.com/albums/h387/Jlow81/7067bc53.jpg

http://i1107.photobucket.com/albums/h387/Jlow81/42e79ef9.jpg

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http://i1107.photobucket.com/albums/h387/Jlow81/dae6beb8.jpg

http://i1107.photobucket.com/albums/h387/Jlow81/4f4d6b6b.jpg

My friend took a 2.5" dia. section of steel pipe and welded 2 nuts to the side of it. I drilled and tapped the 3 bolts that secure the steel pipe to the exhaust flange. If I was to rebuild that section, I would have had him weld three nuts to the outside of the pipe. Easier than tapping the holes. The flat section has 3 holes drilled in it with the middle one tapped 1/4" NPT for an air fitting. outer 2 are just big enough for the bolts to go through. I went to the local hose and gasket store and got a piece of rubber approx. 3/8" to 1/2" thick that seals the pipe to the tool. The plug for the other end came from local plumbing supply. Make sure you either safety wire it or cover with a blanket to catch it if it comes out unexpectedly. Found out the hard way. any questions, let me know. JLow

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Nice tool. I like the set screw idea. I made basically the same thing but made up some J-bolts to hook onto the spring hooks. For 250's, an old film canister and 2 hose clamps works real good to seal the stinger off. I found it's a TON easier if you can get it air tight than having a hose constantly hooked up to it when you're running the torch. Had the stinger cap pop off a RM125 pipe I did, that crap is loud! Also, aftermarket pipes are tougher than stock ones, you really have to plan it out if the dents are big.

DPP_0001.jpg

YZPipe001.jpg

YZPipe002.jpg

Edited by Jeekinz

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Have I heard you can just put water in these and put them in the freezer? When the water expands when it freezes, it just pushes the dents out?

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Have I heard you can just put water in these and put them in the freezer? When the water expands when it freezes, it just pushes the dents out?

Pushes the dents out and then some.

SplitPipe.jpg

Edited by Jeekinz

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