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Showing results for tags 'crankrebuild'.
I own a 2006 YZ250F and currently it has 88 hours on the motor (total), so I`m going to tear it down. About 80% of those hours were logged in the woods. I change the oil and clean the air filter every 6 hours. I typically don`t rev my bike out as I`m only 130 lbs. My question is should I replace the crankshaft? I`m not really sure if it is necessary, but I would like a second (or tenth) opinion. Thanks
HELP PLEASE!!! I just replaced the crank and main bearings on a 2010 KX250F with a Hot Rods crank and bearings kit. All went well during the rebuild thus far. When I attempt to torque (87inlb) the case bolts the crank starts to tighten up and gets worse at the case gap closes tighter. The bearings are seated all of the way. I've pulled the bearings and re-installed them to make sure that they were seated correctly. Upon inspection i noticed that the Hot Rods crank is wider than the OEM crank by roughly 1 mm. Total length is the same but the actual crank body is a little wider. I can see a very small gap between both sides of the crank and left / right case halves. However, the gap is a little bigger on the right side. The crank does not appear to be rubbing on the case though. See picture below. I can't find what the spec for this gap measurement is in the manual. My guess is that the crank being 1 mm wider than the stock is putting the bearings in a bind when I try to torque the 8mm case bolts. Any help would be appreciated. Not sure where to go from here and could use some advice.