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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Can't get jetting corrected
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[QUOTE="ScottS, post: 799655, member: 16996"] More oil (32:1) than less oil (50:1) will lean the bike out because the oil replaces gas. The volume of air stays the same at a given RPM so you are leaner- It is possible the gas was not mixed right ? I am not sure if the difference between 32:1 and 50:1 would cause your problem, but if you mixed it incorrectly it could be a problem. Easy enough to verify- The crank seals leaking may be the issue- most seals leak when the crank starts to go- sometimes the crank will be going bad, if you put new seals in it will run OK (usually long enough to sell it) then they begin to leak beause the crank is moving around too much. If your mixing wasn;t the problem you should either get the tools to do a leak down test or take it somewhere where they will doa good leakdown test - otherwise trying to fix a leaky engine is a waste of time If you to determine that the crank seals are the culprit verify the crank play is in specification before you replace the seals. The oil side seal would make the bike smoke like crazy- I think you would notice that, but the dry side is harder to diagnose When the crank seal leaks it allows the engine to suck air in around the crank- when it does this, not only is teh air unfiltered it is entering the engine after the carb, so it is leaning the mixture out- sometimes the seals will seal at idel but of you rev the bike up or put it under a load it starts to suck air. Make sure also it is lot leaking around the reeds. You mentioned a Boyeson reed cage, maybe it;s not installed right or is not sealed properly [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Can't get jetting corrected
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