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Colbybogolin

300 Crankcase breather blowing air

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Yes they will pulse with the engine rotations. The piston going down in the stroke displaces air and that is one of the main reasons for the crank case breather.

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Some of them make a noticeable chirping sound out of the bottom of the drain tube (flapper hose in place). 

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Welcome to ATV Honda Colby!

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@Colbybogolin, are you having issues with your motor or just curious about the crankcase vent?

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Welcome to the forum .... there is going to be some air blowing thru the crank case vent  

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