Question about 2003 Yamaha YZ 450 F
You may have a head gasket on the way out
Posted on May 08, 2010
All engines have a breather to equalize pressure between the internal crankcase(moving parts, blow by, etc) and the outside air pressure. Heating and cooling of the motor can cause condensation (also stream crossings, rainstorms, mud puddles, etc.)in the motor which will show up in the pollution tube, bottom of the air cleaner, or breather tube as a creamy tan or gray milky liquid. It is normal and nothing to worry about unless you submerged the bike in a stream and filled the engine with water. In this case you need to change the oil immediately and get the moisture out so you don't rust up the motor.
Posted on May 06, 2010
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Posted on Jan 02, 2017
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