Question about 2002 Yamaha TT-R 125 L

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I replaced the crank shaft and when I put the engine crankcase halves together there is friction around the crank shaft - it will barely turn. I have replaced the crank shaft with a factory crank and have a manual so that I am not missing any parts. If I loosen the crank bolts just a little the crank turns freely. I have isolated the friction to the crank shaft (ie. the balancing shaft is not the problem and the bearings turn easily........I don't think that I sprung the crankcase taking it apart ?

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Your crank shaft is probably not completely through the inner bearing races, causing crank to bind up when you pull the crank halves together tight. You have to pull the flywheel side of the crank through the bearing completely before you assemble the clutch side of the case.

Posted on Dec 17, 2012

  • Dan Hamm Dec 17, 2012

    Your crank shaft is probably not completely through the inner bearing races, causing crank to bind up when you pull the crank halves together tight. You have to pull the flywheel side of the crank through the bearing completely before you assemble the clutch side of the case.

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I assume you are using the original left and right crankcase halves. If not there is the problem. Case halves must be a matched set or this type of problem often shows up. Note the positioning pins in the diagram below. Are they both there? There is an chance the crank may be out of alignment (dropped at the factory, Yamaha parts dept., shipping center, somewhere...). Get it checked at a dealership. Please rate my answer. Thanks!
I replaced the crank shaft and when I put the - 3d22da5.gif

Posted on Nov 20, 2009

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