I'm new to the kart racing, I've looked at my three local kart tracks rules and all three have different gear rules. I've taken my clutch off and I can't get the gear to come off. Is it supposed to come off or do I have to buy a new clutch for every gear I want? This may be a dumb question but like I said I have no clue about kart racing. Just trying to have some fun with my son.