ok i went riding yesterday and out of nowhere my trike started making a ping yet tap sound. i put my ear up to it and it seems to be coming from the bottom end but im not sure. i adjusted the valves and tightened the cam chain and still get the sound. it shifts fine and has allot of nuts but that noise is driving me nuts. im lost guys please help me out. ive bin trying to figure it out for almost 3 whole days and i will be looking at it tommarow too.