Expansion chamber off a YZ125, courtesy of a guy at work. He had already cut the front off and it married up nicely to the flared section just behind the footpeg. I had to open the mainjet and re-profile the needle, but seems to be OK so far...has a nice little power-band. Could only do small tests on the road outside home for obvious reasons, but appears to be pretty close. Will look for a stinger section for it...or make one.![]()
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