Forums
New posts
Search forums
Members
Current visitors
New profile posts
Search profile posts
What's new
New posts
New profile posts
Latest activity
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Everything Dirt Bike
General Dirt Bike
More problems on mates XR400....Wet black oil coming out exhaust?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="ossagp" data-source="post: 177849" data-attributes="member: 1650"><p>The compression test won't tell you anything about the valve seals and guides. Those get my vote as the most likely. Usually a bad oil ring on a three ring system has to virtually be gone to make things wet. A compression test tells you more about that. Bad valve seals can show "wet" sooner in my opinion. For the rings to do it you have to get it hotter, rev it higher and back off of it to get the vacuum up. It will smoke badly if someone is watching. Plan on tearing this one down soon. If the seals are bad (valve seals) that means the guides are too.</p><p></p><p>Lots of times removing the header pipe and examining the valve stems for an oil trail works. </p><p></p><p>Lastly, could your engine be grossly over filled?</p></blockquote><p></p>
[QUOTE="ossagp, post: 177849, member: 1650"] The compression test won't tell you anything about the valve seals and guides. Those get my vote as the most likely. Usually a bad oil ring on a three ring system has to virtually be gone to make things wet. A compression test tells you more about that. Bad valve seals can show "wet" sooner in my opinion. For the rings to do it you have to get it hotter, rev it higher and back off of it to get the vacuum up. It will smoke badly if someone is watching. Plan on tearing this one down soon. If the seals are bad (valve seals) that means the guides are too. Lots of times removing the header pipe and examining the valve stems for an oil trail works. Lastly, could your engine be grossly over filled? [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Everything Dirt Bike
General Dirt Bike
More problems on mates XR400....Wet black oil coming out exhaust?
Top