[bacon117]

Ok, so i've rebuilt car motors before, and i've never had this problem..

I have a shop manual, and I follow it to a "t". Plastigauge says the new bearings have the proper clearance. But when I assemble the two block halves and torque them to proper specs (25 N-m), the crank is seized! Now if I torque to to half the spec 12.5 N-m, the crank turns ok... I only have the crank in, no rods or pistons... The bolts are torqued in a criss-crossing pattern, etc.

I have my suspicions as to what the problem is, but I'm not ready to admit it... Let's see if anyone agrees with my suspicion,

IDEAS?

[CBR929RE]

you have to tell us what your suspicion is before we can agree or not.

[bacon117]

i didn't want to influence the ideas! anyway, i thought it was a warped block, but now i'm not so sure. I have a second block, and with the same crank its tight, but it turns by hand. i've had other motorcyle engines that turn easier, so maybe it's b/c the bearings are new, but i've never had this on any other engine...

[sinfuldragon]

Now that is what I call an interesting problem, I'm guessing everything turned over fine before you stripped it down?