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will it make a difference since I have the 840 big bore kit?
I wouldn't know as mine was on a stock engine with stock compression. If yours is over compressioned like so many do...like with 11:1+ then the ring leakage is tremendous and a catch can won't help you. In that case you may have to just bring the crankcase line out and up to the bars and put a small air filter over it to catch some of the oil splatter.
 

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did what you said and this is happening
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I wouldn't know as mine was on a stock engine with stock compression. If yours is over compressioned like so many do...like with 11:1+ then the ring leakage is tremendous and a catch can won't help you. In that case you may have to just bring the crankcase line out and up to the bars and put a small air filter over it to catch some of the oil splatter.
 
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