After a weekend of riding i was looking my bike over and noticed that i had some oil in the airbox. what is causing this, the bike ran fine all weekend and there were some pretty tough trails.

 

probably just dripped off your airfilter

 

No matter how careful I am, a little filter oil always ends up dripping in my airbox.

 

Isn't there supposed to be some kind of gasket to keep oil from getting in the oil filter?

 

Are you changing the topic? I thought you were asking about air filters and oil in the airbox.

warmdye and I were suggesting the oil that you found in your airbox was oil used on your air filter, not motor oil from your engine.

Air filters must be treated with air filter oil in order to work effectively. Sometimes a little drips off into an ATVs airbox.

 

Thats what i meant sorry i know there is oil that is on the air filter but this looks like engine oil.

 

If your engine is experiencing a condition known as "blow-by" it could force engine oil from the crankcase through the oil vent into the airbox. However, "blow by" is generally accompanied by a loss of compression and power, which you probably would have noticed.

Did you roll the machine over or stand it on its end?

 

I did roll it over on its side. I didnt notice any loss in power.

 

It is just something these sideways mounted ute engines do. This happens on my Ranchers, Recon, and 250EX, sometimes big time! Rumor was that later model Ranchers had a baffle installed to prevent oil from splashing into the vent???