I own a 1980 Suzuki JR50. Had it serviced professionally at Dealer and recieved all new Carb parts and overhaul, new top end overhaul and a new clutch. When finished, it started and ran great. Took son to FriendĀ“s house and left him there to play. FriendĀ“s Dad monkied with the mixture and idle without permission and really messed things up. It will now start but runs poorly and will not idle without playing with throttle grip. Such a shame, it was running so good. Can anyone help me to reset the mixture and idle adjustments?