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General Two Stroke Talk / What are the symptoms of the big end bearing worn?
« on: August 16, 2013, 11:23:55 AM »
Roll on ride time then!
Like the Phoenix rising from the ashes Two Stroke Motocross is reborn!
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Mostly for con rod but really shot crank bearing could introduce rotational slop -- but will also allow the crank to wobble a bit.
Bottom line here with this check -
- if you feel sloppyness then you have a problem. You need to tear it down. End of story.
- if you don't feel slopppyness then you still *might* have a problem. If there is other evidence then pull the jug. Otherwise, go ride.Do you mean, crank bearings or conrod bearing?
The only way to correctly determine wear is to check the specs and measure with correct instruments as per manual.
Pree much what everyone else said. When I got my new katoom, I got paranoid about the noise it made which was vid posted here: http://twostrokemotocross.com/forum/technical/engine-knocking/
Mine too drops right off if I pull the clutch.
With regards to big end wear, the easiest way to tell, like everyone said, is to give your flywheel a jiggle. If you're not sure with taht, then pull your cylinder off and take some feeler gauges to the big end from there. Compare to clearances in either your manual or what someone can quote from their manual. My POA would be: Flywheel check, pull cylinder and check for up/down play in the conrod (side to side is normal, to a certain extent) then feeler gauges if you're still not sure.
Good luck.