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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Coolant loss, bike ran bad during torturous mud race
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[QUOTE="Studboy, post: 896747, member: 26867"] I would definately pull the cylinder off and check the bore and the piston. My buddy had the coolant bolt rattle out on his 250 at the sand dunes and we didn't notice it. We ran it all day like that, we were even drag racing it. It would do fine for about thirty seconds of WFO throttle, and then it would bog out (piston expanding into the cylinder!). We kept messing with jets and fuel but could never cure it.... finally after about 4 hours of abuse the piston burned down. Unfortunately the plating also bubbled up and was worn through on the exhaust side. I couldn't believe that it ran that long without any coolant! [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Coolant loss, bike ran bad during torturous mud race
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