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Discussion Starter · #1 ·
I have a 2017 yfz I just had to replace the crankshaft and I rode for maby 10 hours and then I looked down and the swing arm was covered in oil so I took the seat off and looked at the air box and it had an inch of oil in the bottom what will cause this please help
 

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I would recheck the oil level after the bike is warm. If you are certain it's not overfilled look for a kinked hose or plugged breather. If all that looks clear your rings might be bad pushing pressure into the engine.
 
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