If your drive chain slips while you are riding, you should:

A drive chain that slips or breaks while you are riding could lock the rear wheel and cause your motorcycle to skid. If the chain slips while you are riding, pull off the road and check the chain and sprockets. Tightening the chain may help. If the problem is a worn or stretched chain, or worn or bent sprockets, replace the chain, the sprockets, or both before riding again.