Dents in expansion chamber

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12/21/2010 4:16 PM

There is a big dent in my expansion chamber and a few small ones. does this affect the preformance of the bike? And how would I fix it. I heard something about filling it with water and freezing it..


12/21/2010 4:42 PM

Depends on the size and location of the dent. Small ones don't matter too much. Larger ones have to be pretty deep to cause problems. Also, the larger the engine, the less you will notice. Freezing can work but it can also split the pipe open. Sealing each end, pressurizing the pipe, and heating the dent works quite well. Cutting the pipe apart, pounding out the dents, and welding the pipe back together is another method. Post a photo of the dents so we can help you decide if it is worth the trouble.


Bret Bonham

3/11/2011 5:34 PM

Don't freeze it. This process ussually results in split seams because when the water freezes, the expansion is not controlled.
Send it to or and get it done right.


3/30/2011 4:33 PM


3/31/2011 4:35 PM

zippy895 wrote:

at first i thought that was a great idea until i saw the boom


3/31/2011 4:41 PM

I only used 25-30 PSI and always had a small ball peen hammer ready to smooth it out