Gas leak from air box

Yamaha XJ 750 discussion forum:


Gas leak from air box

Gas leak from air box 
Lyle 07-09 said 2005-07-10 03:34 
 
HELP!!! On my 1981 XJ-750 I am having a problem with gas mixed with oil leaking out of the air box when the engine is running. Is there some sort of modulator valve or engine vent that is vented into the air box. What would be the best approach to fixing this problem. 
 
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