i have a 04 sportsman. The bike creeps forward when at an idle when in forward and the same when in reverse. Also the shifter gets stuck in gear unless i shut the bike off and then put in gear.It usually gets stuck in reverse. If i tap the linkage at the gear box it will go back into nuetral and then i can shift to forward. The bike is reving 1200- 1250rpm at an idle. Any advise?