Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1999 yz250 Oil from Exhaust
Reply to thread
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
.
Message
[QUOTE="KX250Dad, post: 1159185, member: 74039"] The YZ250 doesn't have oil in the crankcase other than burn from the premix which lubes the rings/bearings. Only other oil in the crankpart of the case could come from the trans/clutch which can leak thru the seals so check your levels. You want the head pipe to seal against the cylinder, which it appears you've already discovered. Oil from the silencer end and between the silencer / pipe coupling is not uncommon, especially when riding the 2 stroke low in r's. Take the pipe off and look inside, I suspect you'll see a considerable amount of carbon and it may be wetted should you be running 30:1 with a cool plug. Times have change since '99 and guys like me who ride a 250 below 6000r's no longer carbon our power valve mechanisims closed, we simply have alot of spooge, to the point it comes out the power valve vent and silencer. If the oil you refer to is greyish it can only come from coolant which can only enter the firing zone thru the head or cylinder base to crank... check the coolant level as well. Spooge is somewhat your friend at least you know your not running to lean. I wouldn't suggest any jetting mods until you get adequate run time and manuever from there. Average riders can use book spec on jetting. Point here is you need to develop a baseline to make jetting decisions. Good Luck [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1999 yz250 Oil from Exhaust
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom