If that is the case then the OP has a problem as I haven't seen a double stack pulley that is 1-1/8 ID. And I just had a problem with CC ZTR where customer went out and got an engine with a 1-1/8 crankshaft to replace his current engine. The problem CC didn't make drive pulley that was 1-1/8 id for that mower series per CC tech support.This is shaping up to be a used engine refit with a larger crank diameter.