Hi I have a 2004 yfz450 that has a oil leak!! I have lots of oil all over the oil tank and the cooling fan and the engine. I have wiped it down several times and rode it a little but can never tell where its from it is alot of oil all over the place!! I cant see nothing from the head gasket the only thing i can see is it drip off where the exhaust comes out of the engine i have no idea what is going on please help!!! The oil level is maybe just a little high but real close. Anyone want a yfz? Im ready to get a new quad!!

 

Hi all I noticed there is a hole above where the exhaust comes out. This is where the oil comes out along with air pushing out here too!! What is this ? Is this blow by? please help!!!
Todd

 

It's where the de-compression devise goes into the head on the dirt bikes..........

CLICKY for the fix..........

It's a seal and a plug.........

 

i have the same problem on my sons and cant figure it out what is the fix dont want to pay a dealer if i can do it myself thanks

 

Found an old post mepaget. Welcome to the forums. If it's what was talked about above it's where the dempression cable goes in for the hot start on the dirt bikes. (same engine) Yamaha put a plastic plug that was known to blow out. I had it happen.

Important thing is do not ride it. you will lose oil and junk will get in the engine.
Here's what you need.

yfz450 decompression plug - Google Search