i did a motor swap with my friend *long story* for my stock 919 motor for his bored/built motor *919 with 970 kit and built head*. well the motor runs great and all...but once the motor warms up you can hear a slight knock if you pop the throttle. it happens after the revs go down. it's not real loud *maybe cuz i don't have a pipe on the bike right now* but you can hear it slap a couple times. is it the main crank bearing or rod bearing?? i haven't ridden the bike or rev'd it up real high cuz i wanna fix it before i tear something up. the crank and rods are stock btw. any help would be great. and what would be the best place to get the best bearings??? thanx, patrick
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