My cart a 79 ezgo with a robin engine EC25DS wont move. This cart has been rigged to run with a toggle switch when the key is on, so its in a idle mode all the time until you depress the petal. Now when the petal is depressed the primary drive clutch wont clamp around the belt to make the secondary clutch go. It was fine until I decided that the muffler (after I gave it a BBQ) really should be bolted to the engine instead of just hanging there. So to recap it runs but wont go. Any suggestions?