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Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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[QUOTE="_JOE_, post: 1364876, member: 77507"] I would start by getting it torn down. It sounds like the ports may chamferred a bit more seeing how the ring got snagged. Measure piston to cylinder clearance before reassembly. I think the ring gap should be closer to 12 thousandths on a 125? Once it's back together swap the main jet out for a few sizes bigger. It would be a good idea to have somone do a leak down test to verify the crank seals. Make sure the intake boot and reed cage gaskets are in good shape. If all that looks good go ahead and do a plug chop to see how the main jet is working. [/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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