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what does it take to fix the oil blowing up in the air box and then getting sucked down the carbs and causing blue smoke?
 

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Many of the engine builders get into this on the brute forces when they run high rpm or long runs. Most of them run the oil level a bit low,..but the engine builders also do a mod when they do the engine. In stock form the crankcase is only vented from the front cylinder. While they have it apart,they drill a new crankvent into the rear one and T them together and that looks after it for the most part. If it is still a problem after that they use a catch can from the vent line of a YFZ450 quad in line there.
 
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