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Crank case coming out of Crank case breather

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On 8/4/2021 at 9:06 AM, Franky Beaudry said:

Crank case coming out of Crank case breather of my kx250f...normal or not...after 4 rides top up half court 

Translated to english, you probably meant 'crankcase oil oil coming out........top up half quart'


What type of riding?  as 4 MX track days is very different from 4 trail rides at more moderate rpms.


With these low tension ring/short skirt slipper piston type engines, some oil consumption is normal,

maybe 10ml per hour of MX track riding but excessive leaking out of the breather hose usually narrows down to two things:

-engine oil overfilled

-combustion blow-by in crankcase due to worn piston rings


Edited by mlatour
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