g8 clutch issue

lady bug

i have a yamaha g8. the problem im having is that the secondary or primary is not working properly. for some reason all of a sudden it wont get up past 18 mph but revs out wene i get there. i rode it with the seat off and look at the clutches and the belt is not near the bottom of the secondary at full speed.also not at top of primary. so i pulled primary apart inspected. everything seemed to be in working order so i pulled secondary apart and that seemed ok also but i orderd a new sliding bushing and ramp shoes just to give it a try but i just wonderd if anyone had any input on this.

BGW

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Mike Mac

Did you ever get this resolved? If not get ahold of Smallblock or The New Guy! They know everything!!! Many others too, but they'll get it... I think Ess is a Guru also.

spriddle

If your clutches are ok, check the tension cable under the air box and make sure it is adjusted tight and not allowing the engine to move back. Also check your front motor mounts. If the engine is moving back, it will keep the tension off the belt/drive system.

lady bug

im still having the issue after changing bushing and ramp shoes so i switched back to stock spring and it works great just wont work with torque spring

spriddle

That sounds like your drive (front) clutch is weak: worn weights or just worn out.

lady bug

i have inspected drive clutch no cracked or flat spots on the wights drive clutch works fine with stock spring

spriddle

A stock drive clutch should have enough power to pull the belt all the way down the two sheaves on the rear clutch system even with a torque spring. If not either the clutch is weak, engine is moving back and taking tension off the belt, no spacer or incorrectly installed spacer on the rear drive shaft, or something didn't go right with the torque spring install. Or, it might possibly be that your engine is not hitting enough rpms: not likely but possible depending on governor adjustment/cable/throttle...........

Mike Mac

Sprid, you know your stuff,good lesson here

lady bug

OK im going to try to explain this the best i can but it is going to be a lot of typing. i bought a torque spring kit from a local dealer around here spring/spacer i have installed this on my cart. it has worked fine for month smooth shift out and all. i wanted to see what one would give me more top end stock or torque spring. of coarse stock gave me more when i went to reassemble i noticed the bushing on the sliding sheath was a bit loose not a tight fit like i would like but i put it together with the torque spring back in. drove it and it still continued to work great . i wanted more power so i pulled the moter basic rebuild port polished the head cut it down a bit and put it back in my cart ran great tons of power and shifted out great top end with torque spring about 32 on gps 22' tires. then i got home one day and it wouldn't start ended up being a bad coil so i replaced it with and excel coil and it ran fine. until i took it for a drive and hit the rev limiter 4200 rpm or so and it was only going about 15 mph. i watched it while i was driving to see what was happening and it looked like the drive belt was about 1 inch from the top of the clutch i Evan put my hand on it after i got back very hot so hot was smoking i know the moter is not rocking back because in place of the cable i have a grade 8 bolt that i adjust and i can watch the moter minimal torque back. so i pulled the driven clutch apart installed a new bushing hoping the old one was holding me up and figured put new ramp shoes in while i am in there. i did this and it still wont shift out. so i installed the stock spring and it shifts out great i can see the primary clutch is in good cond i think that when i installed the torque spring maybe i didn't have the sliding sheeve on good or something not really sure to be honest spacer is installed with spline toward cltch im confused on this one guys

spriddle

This is best guess without really looking at your cart. And this happens quite frequently when installing these torque kits. One reason my instructions say to use a ratchet strap in order to pull the inner sheave all the way down. More than likely the outer sheave didn't install all the way on the half moon key and it was spinning. This would in turn cause your belt to slip, get hot, and possibly smoke. Also it wouldn't allow enough tension to be placed on the inner sheave to separate the two sheaves properly and cause the cart to run slow. The further down the belt rides on the rear clutch the faster the cart will travel. And the further up the front clutch the faster the cart will travel. I'm also pretty sure the spacer should be install with the splins in toward the rear chunk. I think it will make about an 1/8 inch difference installed the other way. Best guess without looking at mine. Might want to also check to make sure you don't have any grease on your belt, sheaves, or shaft. Over greasing the clutch systems on these is easy to do and once it hits the belt it is one big mess and will ruin a belt. It could also be the other way around. No grease on the bushing you installed and it is hung up a little on the drive shaft and not allowing the inner sheave to move at all. Probably not this case since the stock spring seems to have the cart operating normal. If you notice a little more torque with the spacer and stock spring than before with the c-clip and stock spring it is a good indication that the spacer is backwards. Shouldn't hurt anything but will increase torque by a little and lower top speed. If you tear it apart again, notice if the spacer ends where the c-clip used to be or if it covers it up a little. The spacer should give the same clearance the c-clip did. Some people have experimented with stock spring location but I've never found a difference with this at all. I usually just install them in b-4. I personally don't think twisting the spring or location makes a difference in torque or speed. Twisting the spring seems to me could cause it to possibly break later down the road.