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Old 03-26-2011, 06:15 PM   #2
GMB74
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Yamaha
 
Join Date: Jun 2009
Location: Heluvabump,VT
Posts: 623
Default crank seal in the clutch and fan side of a G1.

Since the other links are now dead, I thought I would post a tutorial on G1 crankshaft oil seal replacement. Unlike a 4-stroke engine, crankshaft oil seal integrity is critical for a 2-stroke engine to work properly. These engines are now over 20 years old, and the rubber seals have deteriorated. They may allow outside air to leak into the crankcase, resulting in a lean fuel mixture, high combustion temperatures and a siezed piston. They may leak fuel mixture out of the crankcase, resulting in the engine running poorly or not at all. Small leaks can keep the fuel pump from working, since it needs the crankcase pulse from vacuum to pressure to work properly.
This post will deal with replacing the fan side seals. The images are of an engine that has been removed from the buggy and is mounted on an engine stand. Most people will replace the seals with the engine in the buggy. I will post a companion tutorial on replacing the clutch side as well.
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