Question about 2003 Yamaha YZ 250
Sounds like an overly lean condition accompanied by a high compression situation. Perhaps the bloke that owned the bike before you had the head cut to increase compression. In this case, you could either replace the head or run high octane fuel.
Also - look at the water pump condition - seals and the drive gear. The seals might be leaking if your oil is discolored and the gear that drives the impeller has been known to shed teeth over long periods of time. It is also quite possible that the bearing is shot.
Also check to make sure the head pipe does not have any leaks near the cylinder.
Posted on Oct 11, 2010
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Posted on Jan 02, 2017
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