Just built a live axle go kart with 145/80/6 tires/wheels a 60t axle sprocket and a 30 series torque converter with a 10t sprocket and #41 chain running a 6.5hp predator engine. Also have a 6" disc brake setup. The wheels seem to spin fine when the kart is up on jack stands but I can't seem to get enough torque to properly propel the kart on the ground. The sprocket and wheels are keyed into the axle and I am using locking collars. Any ideas? Thanks