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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
RM 250 fouls up spark plugs-need advice
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[QUOTE="Rm250sRalRight, post: 751476, member: 52712"] Hi all, My 96 RM 250 has developed a problem where the spark plugs will foul up after riding for just a few minutes (anywhere from 15 to 45 min). The plug gets covered with oil and fouls up. Initially I suspected I was running too rich a mixture. So I rejeted the carb with a leaner set up (changed the jets to a smaller size) and also changed my fuel mixture to 46:1 (I usually run 40:1) This didn't seem to help, the bike still fouls up the plugs. It also drips some of that dark gunk out of the tail pipe, although it seems that most bikes do that anyway. What can I do here to correct the problem? I mean, I don't know what else I can do. The bike is as lean as it can be and this still happens. PS: the bike was running fine during the summer, than one day this started. Basically when I install a new plug and run the engine a bit, there will be fresh oil/fuel in the threads and it doesn't seem to burn up. I can't tell if this is transmission oil or mainly premix. Someone suggested that my camshaft seal may be leaking transmission oil into the engine and that replacing the seal should solve the problem. Do you agree with this? Naturally I would want to try a simpler solution before taking the thing apart to replace that seal. Should I have no alternative but to replace the camshaft seal, how big a job would this be? Could anyone that has done this tell me what's required to do this? Perhaps there is a set of instructions of how to do this online somewhere? I have the Suzuki manual but it doesn't show how to replace the camshaft seal. I'm hoping that there is a better solution, but in the event there isn't, any help would be appreciated. Thanks in advance. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
RM 250 fouls up spark plugs-need advice
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