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Oil out of breather tube on YZ250F
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Posted by: vancerd---------------------
Yesterday I rode my new YZ250F on a race track for the first time. When I was done riding I noticed that the area around the left foot peg was wet. It looks like something (oil?) had been dripping out of the overflow tube (about 1/2 inch tube) that runs from the top of the engine, down the down tube, and ends right in front of the left foot peg.
What is the purpose of this tube. Is it an breather tube? Is it normal to see oil coming out of it? Is there anyway to put some coarse foam or something in the top of it to prevent oil from coming out?
Posted by: christopher---------------------
Have you cleaned and oiled the airfilter lately?Sounds to me like filter oil dripping off the filter and running down the tube.
Posted by: Rich Rohrich---------------------
A little oil from crankcase blowby is normal when the engine is revved hard. This is especially true when the engine is fairly new and the rings haven't seated completely.
You can use a small K&N crankcase vent filter on the end of the tube but it isn't really necessary. http://www.knfilters.com/vent.htm
Posted by: Boozer---------------------
Quote:
Originally posted by Rich Rohrich
You can use a small K&N crankcase vent filter on the end of the tube but it isn't really necessary. http://www.knfilters.com/vent.htm
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i think they might be a good idea. after inspecting my valves recently, i found a fair bit of junk (dirt, sand) on the inside of my engine cover. the breather hose is the only way in.
i also have a bashplate, so maby that helped by keeping the crud near the breather hose.
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