Hmm, unfortunatley i am not as familiar with the 5 speeds as i am with the 3 speeds, I have one but I haven't opened it up, also check that your belt is on correct and all the keepers are in the right spot.

Failing all else open up the box and pull the input shaft out and check for wear or scoring.

Last edited by nath; 05/09/15 07:19 AM.