This is probably a noob question but do you have to replace the clutch bell in order to change to a bigger spur gear. I'm tryin to add a 58t spur on my jato 3.3 but there is no room to move the motor to create more clearance between the spur and the stock cluth bell. Also does more teeth mean greater circumfrance of the spur. I would really appreciate you guys help. Thanx