How fast should a Yamaha G2 go?

deerslayer1985

I have a 1990 Yamaha G2. I lifted it, and put new 22 inch tires on it. It didn't go very fast it kept cutting out. I found out it had a broken clutch weight. I fixed the weight, and it no longer cuts out. It drives pretty smooth now. I adjusted the governor as far as it would go. I got the cart up to speed on level ground to see what it would do. I can only get 15 mph. I figured it should be a little faster than that. With the governor completely adjusted to the max, and 22 inch tires what should a G2 run? I'm not really worried about speed. I actually want more torque for hill climbing, but just wondering if something could be out of adjustment or something I need to fix. Any advice for something to check? Or is that about the right speed?

BGW

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slonomo

You should top out at 22-25mph with the bigger tires. Some might even push 30mph if its running really good. So the question is....how is it running? Have you tuned it up? Cleaned the carb? Also, what kind of condition is the belt? All of these will rob power.

As far as the torque? You ate up all your torque when you put the big tires on, so you'll have to work on the secondary clutch to get it back. Some people put on a stiffer spring, some go with a performance clutch kit that will keep you in the power longer.

abieex

Call Don at plowmans about his secondary clutch kit, its designed for the problem you currently have.

deerslayer1985

Yea I know I lost the torque with the big tires....lol I have plans of the torque kit. I was just kinda saving some money up first. I just wanted to see what else could be keeping me from getting the best performance out of this cart. I have done a tune-up on it. It seems to run great. I changed the gear oil, the oil, new air filter, and the filter box is sealing good, new fuel filter, new spark plug, and 5 gallons of fresh gas with fuel stabilizer in it. It seems to start up and run really good. Thats why I was wondering what the problem could be. Now the belt measure 1 1/8" wide, but it seems to be loose on the clutches. Like just sitting still not moving the belt is real lose. Is that normal?

slonomo

I'd check to see if your clutches are shifting out. You can do this by securing a camera inside the engine bay while driving down the road.....NOT! Put the cart up of jack stands and watch the clutches while you rev the engine. Let it rev all the way out, but be careful not to float the valves. If your clutches aren't shifting out you might have a problem with the clutches and belt.

Trent3

The clutches are new to me, and I am just learning. Can there ever be a condition where the clutches respond different with the cart on stands vs traveling under normal load?

I kinda like the camera idea.

Trent

sho305

Take the rear body off and watch them from the passenger seat, or mark them with a marker inside and let the belt wear it off to see how high the belt gets.

I would inspect the alum sheaves on both clutches, they wear from dirt and get dished in. Then they don't shift as well. What can help is get a 1 1/4 wide belt instead of the stock 1 3/16, the HD kevlar belt from CPP is like that and it works really well on my cart with old clutches. I think it makes up for lost width from the wear. I do have a clone engine in there now, but big difference when I swap belts with the stock one. Also a cut secondary sheave, or cut yours, helps a lot at very low speeds and takeoff as it gives a lower gear. The wider belt does this somewhat. Also clean and lube both clutches. Check the tension cable under the gen pulley it holds torque under high throttle. It will bog on takeoff if loose or broken. Worn belts are worse and worse for bogging, yamaha says 1" wide is limit for cart but lifted it will hardly go at that point.

G9 does not have a rev limit in the ignition like a G2, but I hit 30mph gps with mine on pavement with 22s. Mind you I had to put 15psi in the rear tires to get enough gearing lol. But another G9 with the governor still on would run 27gps, you should at least get 25 unless you have lower profile tires or your 22s are short. They are all different sizes. Mine are like 2" taller than a guy I know with 12" wheels and low profile 22s on his...his are much shorter tire. Mine measure 23 tall with 12psi or more.

Clutches do respond to torque that is what the ramps on the secondary do. You can remove it and preload the spring more it will keep rpms up higher at part throttle. Can also stretch the stock spring or buy a umax spring. You still have 9hp you can only do so much. Clutches will just shift out all the way with no load, and may not act the same under load.

deerslayer1985

My tires measure slightly taller than 22" prolly 22 3/4. The belt on mine is only about 1 1/8" thats being generous too. its between 1 1/16", and 1 1/8". Also the ramp shoes are completely gone on the rear clutch......I am going to get new ones, and put them on. I'm definitely gonna get the new machined sheaves, and torque spring. Will the ramp shoes being on the ramps help the way the cart shifts, and with the torque and speed? I'm anxious to get all this stuff done. I'm just trying to figure out what all needs to be replaced/fixed before I start ordering. Thanks for all the help.

sho305

The ramps are more for how it reacts to throttle change, they let the engine rev more when you step down on the gas for example. They make rpm go lower when you let off to go a steady speed. If the ramps get chewed up they will not work right. I would buy a machined sheave they are not much more and you would have new ramps and sheave. But mostly that stuff hurts takeoff more than top speed. Does the belt get to the top of the primary at high speeds? I'd get a new belt and then check it.

Just remember that has a rpm limiter in the ignitor, so it will cut out at high rpm. When it does that you are at max speed no matter. If its not cutting out the governor is keeping it below that rpm. The other thing that will keep it slower is the belt not getting to top of the primary due to an issue with the cvt/belt. Or you have some issue with the engine not making much power. Some have talked about the muffler plugging on those but I never seen it long as they were not burning oil or otherwise running poorly for a time.

danmcglathery@gmail.com

I am having a similar problem with my stock G2. I have adjusted my governor to get more speed but it gets up to about 14 mph and then slows down to about 12-13 and thats where it maxes out. It's almost like it is still being limited. Not sure if this is a rev limiter which I doubt since it doesn't seem like it is over reving or something else. Is this common with just adjusting the governor? Should I try the governor bypass any thoughts would be appreciated. I am new to carts and am excited to learn!