Prevent drive belt from slipping?

[Field6565]

Hi all. I suspect that my drive belt is slipping. I notice it the most when I have a lot of weight on my cart going up hills. The RPMs are way up but the cart is moving slow. Also when I throw it to the floor from a stand still you can feel it slip then grabs hard. How can I correct this? My belt width now is 1 1/8. Would a wider belt help it? How about a belt that's 1 1/4 wide. My cart is a G1 with a clone motor and G2 rear end swap with stock clutches.

[sho305]

The secondary spring regulates belt tension, I'd drop a umax spring in it they are not that expensive and for offroad and hauling they really help. If you have the stock spring it may be toast they don't last forever. For worn clutches maybe even new a 1.25 belt can work well it helps out of the hole some. A cut sheave also helps, those three mods I have on mine and would say they helped quite a bit and also work well on the clone. I am going to buy a new stock spring and see if it shifts out differently as my old one is beat, I think a new one will work ok even my old one didn't slip in my use and I tow stuff at times. Also check your tension cable that can make it act bad on takeoff the engine moves towards the trans, its under the gen pulley. Could also have a problem with the primary clutch if those things don't work. I run the kevlar HD belt from CPP it works well and is cogged. I want to try to be quieter at night with the stock spring at low speeds, but the umax is great on trails and for towing/etc.

[Field6565]

Originally Posted by sho305

The secondary spring regulates belt tension, I'd drop a umax spring in it they are not that expensive and for offroad and hauling they really help. If you have the stock spring it may be toast they don't last forever. For worn clutches maybe even new a 1.25 belt can work well it helps out of the hole some. A cut sheave also helps, those three mods I have on mine and would say they helped quite a bit and also work well on the clone. I am going to buy a new stock spring and see if it shifts out differently as my old one is beat, I think a new one will work ok even my old one didn't slip in my use and I tow stuff at times. Also check your tension cable that can make it act bad on takeoff the engine moves towards the trans, its under the gen pulley. Could also have a problem with the primary clutch if those things don't work. I run the kevlar HD belt from CPP it works well and is cogged. I want to try to be quieter at night with the stock spring at low speeds, but the umax is great on trails and for towing/etc.

Very good points here sho.... im gonna go ahead and tighten up my engine cradle. I used urethane bushings on it and now you have me wondering if my motor is pulling toward the secondary under load.

[slonomo]

Gary, mine doesn't have the "torque cable" and the cradle is still mounted with the stock rubber mounts and it moves about 1/2" to 3/4". I'm sure this takes away some power initially but once the engine is going it shouldn't make too much difference. I have an idea on how to stop that with a piece of flat stock bolted to the front engine mounts and securing it to the swingarm somewhere. That would eliminate the front to back movement of the cradle/engine.

Since the clone engine has so much more torque than stock I think you just need to get everything lined up real straight and tight. What Sho said about the secondary is true. I removed my Plowman's red spring and went back to the gold G1 spring....not really liking it. I'm sure mine is worn out as well. The red spring had way more low end torque. How tight is your belt? You might want to try a wider belt, you'll get more low end pull from it. I don't know that a wider belt will grip any better, except maybe because it will be new. Once your belt gets heated and glazed over it's done. I've seen some guys with atv's use sandpaper on the sides of the belt to get more run time, but I don't think it works for long. As soon as your belt slips, it's done. Get a new belt.