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Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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[QUOTE="RobbyB, post: 1366004, member: 110302"] I'm wondering if the damage I'm seeing was due to the piston catching the port? I went with a Namura pist and I found that the motor was making a bit more noise that when the previous Weisco was in there. Someone posted a piston pic on another thread that they claimed had caught a port and the damage looked identical to what I have here (I wish I could find the pic again). Is it possible that only a very small area of the piston top could catch a port (3/16ths wide)? All ports appear to be chamfered. The direction I'll likely take is to pull it right apart to be certain that its clean. This is frustrating due to the motor being completely rebuilt with new bottom/top ends with a new rod. I have the receipts and know the guy that did it. He does the bikes of many of the pro racers in the area. These shops won't warranty motors after they leave running as to many run lean, don't clean filters, etc and abuse. Thanks [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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