Crankcase breather or engine problem?

P

Pantaz

Member
Dec 13, 2001
144
0
I was riding a friend's '96 XR600R the other day and noticed the "problem". I was sitting on the bike (with it running), and reached down to pick up a glove from the ground. I felt air puffing against my air -- it was coming from what appears to be a crankcase vent hose.
Is this normal?
 
I

IrishEKU

A General PITA.
LIFETIME SPONSOR
Apr 21, 2002
3,806
0
What side?

Another question to ask was it near the exaust?

DETAILS!


It helps.

Phillip
 

Rich Rohrich

Moderator / BioHazard
LIFETIME SPONSOR
Jul 27, 1999
22,839
16,904
Chicago
Yes it's normal, all four strokes do it to some degree, which is why the crankcase is vented in the first place. It's just more obvious when a 97mm piston is whipping up and down in the cases :) As an engine wears it's compression rings it tends to pressurize the crankcase even more than usual and the effect is increased.
 
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