426f top end, to rebuild or not to rebuild

3 replies to this topic
  • robinson426f

Posted November 04, 2004 - 05:52 AM


i have an 01 yz426f and ride it at least everyother weekend pretty hard, it still rips on the stock piston and rings. the question is whether or not i should replace them before they go up in smoke or keep hauling till the power starts falling off. thanks :cry:

  • rsstom

Posted November 08, 2004 - 01:23 PM


Do a compression test. That'll give you a pretty good idea on the top end's health.

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  • rws

Posted November 08, 2004 - 03:33 PM


I agree with rsstom... a little "checkup" could help with the diagnosis. No need to fix what ain't broke... but don't want to wait too long otherwise... it's too broke. :cry:

A few minutes with the compression guage... that's a good idea.

  • yamaboy23

Posted November 09, 2004 - 11:08 AM


pressurize the cylinder with a leak-down tester to see the condition
also if someone has a boriscope to peak inside wouldnt hurt either
i have about 100 hrs on my 2000 model and im not about to break open a perfectly good motor
the 2- stroke mentality doesnt apply here
good periodic maintenance and your bike will last longer than the average

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