[sho305]

What I would recommend is you make sure the clutches are working right first. What clutch is on the engine there are different ones used. The original was alum with the bolt hanging out it is fairly slim. G2/9 ones were also put on them as replacement they have gold cover that sticks out and is rounded. Those have a grease fitting on the edge by cover edge, 2 pumps max in there. The secondaries the old ones don't have fittings new ones do, they are above the ramps in back of inside sheave. Otherwise clean inside spring there and spray grease it. Should clean both clutches and grease center bushings at least. Some clutches on engine (primary) you can oil the pin and pivots inside.

For mods you can get a cut sheave for most carts it will help a lot for pulling, it pushes the belt up to top for lower gearing. You can cut yours too. A spring for it can also help keep rpm higher but be careful some cut top speed only get the ones recommended on here or from CPP or plowmans I know are good. Also check the motor mounts if the engine can move closer to the trans it will bog on takeoff you will have a hard time pulling no matter what. Some yamaha have a cable by generator to hold it. If you have the original G1 clutch you can take it apart and make a shim from pvc pipe to go behind the spring and give higher engagement rpm. You can also see if there is a HD kevlar belt CPP has them, for a G1. They are wider they work better for pulling and if your clutches are worn inside.