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Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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[QUOTE="RobbyB, post: 1364943, member: 110302"] These are lots of good points made, thanks. The piston is burnt a tiny bit on the exhaust side. You pointed out an important point about something I wasn't aware of. The needle only regulating fuel upto 3/4 throttle, then the main jet works above that. I need to check the main jet, and as mentioned, go a little richer when riding in the sand. I think the ports were chamferred properly, I think the ring broke due to insufficient end gap combined with heat?? This never damaged the jug. The bike also has the ProCircuit pipe and silencer on it. I read somewhere that this can lean the system as well. I haven't had the bike apart yet to see where were at after the last blow-up, but I'm thinking that the piston will look the same. The puzzling thing is that the damage occurs after the bike is stopped. This is the way it happened both times now, the bike was stopped left for a few minutes, then no compression. I think I going to go with the Yamaha piston and get the right one for my jug, as it has been nickeled. I'll post some pics. [/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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