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Old 03-19-2018, 04:40 PM
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Default Yz125 bottom end kit

     

I'm going to be doing a bottom and top end rebuild on my 2003 yz125. I'm going with the wiseco piston, but need to hear some opinions on the bottom end. I've read the wiseco cranks are utter **** and I should go with hot rod. Has wiseco done anything about this recently, or should I stray from using their cranks?
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Old 03-19-2018, 07:03 PM
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Any replacement crank should be checked for runout prior to the install to insure it's life. Far too many come from the factories with the runout being off a good bit. If installed as it comes out of the box it can fail in short order.

Paw Paw
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Old 03-19-2018, 07:16 PM
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Quote:
Originally Posted by PawPaw View Post
Any replacement crank should be checked for runout prior to the install to insure it's life. Far too many come from the factories with the runout being off a good bit. If installed as it comes out of the box it can fail in short order.

Paw Paw
Any links you can refer me to in order to check this? Also, are you saying that the wiseco cranks are fine as long as the runout is on point?
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Old 03-20-2018, 10:00 AM
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Service manual shows how to check run out and what the spec should be. I have heard the horror stories as well, but my experiences with wiseco and hot rods both have been good. I have a trail ridden yz250 with a wiseco crank that probably has more than 100 hours on it. I put one in a friends crf250 that went just over 100 on the hour meter before it failed. He actually got more out of it than the stock crank. These are my experiences. Ymmv
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