Question about 2002 Yamaha YZ 426 F

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I have a 2000 YZ 426 it was blowing smoke like crazy so i took apart the top end! what all do i need to be looking for?

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Check your bore for scores/marks wear also the piston,,if they both look good get some new rings,,also check your valve stem seals as they also cause heavy smoke when worn out,,check if your valves are leaking by pouring fuel in the intake port and exhaust port,one at a time and see if any fuel leaks from the valve faces.

Posted on Mar 20, 2011

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