Originally Posted by
billetbirdcage
I gotta assume we are talking a dry sump type belt and not a regular V belt.
1. Too tight and they can break because they get tighter when all the aluminum expands and makes it even tighter. You should be able to turn the belt roughly 90 degree's on the edge between the 2 pulley's when tight, if not your likely too tight.
2. If the bolts hold the coupler/pulley on has too long of bolt heads (usually from having lockwashers or something on the bolts), that if the belt moves forward slightly the bolt heads can start nicking the front edge of the belt and cause breakage.