Inside the cowling, where the cable is attached to the cam, yo can adjust the slack. But you need to consider why it is now not going into gear. If your cable is going bad, there is a place in it somewhere where it is frayed. Trace it from your shifter all the way down to the motor. Open the shifter and inspect to make sure that none of the linkage there has broken. It is not hard to replace on your own. Lot's of great Youtube videos to help
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