VC460 troubleshooting help

Daubers

Hey gents. I just finished my full cart build and got to test drive it. G22 with vc460 swap kit. While trying to go slow during break in, the engine is clearly not shifting out of low gear as the rpms were shooting up. Like 4k rmps at MAYBE 5 mph. I also am having an issue now getting it to shift from reverse to fwd. I must say I have virtually now experience with these type of clutches/transmissions. I do have a high torque spring in it so I am going to get a stock one for it, but considering that Vegas Carts told me to run it with the high torque spring I am thinking there is more wrong than just that ( hopefully not!) I would love to hear the thoughts of those with much more experience than I one these.

BGW

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raydhd

They say right in their installation instructions NOT to run the high torque spring. And if I remember right you have the dreaded pink spring in your secondary.

Daubers

Yes I know what the instructions say. I spoke to Aaron directly about it to see if it would hurt anything or just just give lower top speed and more jump off the line. He said to go ahead and give it a try. As I said, I know it needs to come out, I am just asking if my red spring could be causing all the problems. I really hope it is but from what I was told, it shouldn't cause these issues and if I could have other issues with the clutch I would like to get them addressed while I have it apart. Just trying to take away some guess work if possible.

sho305

First thing I would check is if the belt is too tight and you need to move the motor. That would cause shifting issues and with my 94c clutch it also caused it to not want to start shifting on take off, above about 10mph it was fine but would rev like crazy at low speed. Looser belt and its much better. A wider or shorter belt can cause same things.

Far as the spring I ran a umax with my clone and stock G9 clutches, but did have a cut secondary sheave on it. It worked great, the clone likes a little rpm at least little more than stock. But then I moved to a 94c I got because even with drilled weights the G9 clutch would not rev more, I had put 1.3 ratio rockers on the clone and other stuff. The umax spring made it rev hard at low speed even more. I put a new stock one on because my original was really weak, it worked much better than the umax. Then it broke and had to put the original on again, now I bought another new one to put on.

So the umax which is maybe 2/3 of a big aftermarket spring worked great on the stock clutches, but the 94c primary is different and did not like it. Now the v twin guys will tell you to run a stock spring, but the v twins have gobs of torque at right off idle so they like to run low rpm. The clone likes to see 3500 or more to get max power depending on what you done to it, it has some torque at 2500 and up but not like the twins do. When you hammer it you want it to rev, the twins don't need to rev at least stock based twins don't. But on the other hand its nice to have it calm down then you are not hammering it, so the clutch needs to shift some. If you wind the secondary up hard with preload or put a huge spring in there, it will not shift it will stay higher rpm all the time. The umax is in between and you don't lose top speed with it.

I would recommend plowmans he has great stuff, he has a lot of springs he will get you the one you need for your setup and they usually work great. The umax is a stock utility spring from yamaha, its properly engineered, its a step up from stock and works great on lifted carts. It was made for yamahaulers with box on the back and utility (work carts) carts.

The cut sheave I got at CPP. It gives a lower initial gear (first gear) so it is nice for towing or steep hills, starting on hills, hauling heavy stuff. It sticks the belt out the top a little on the secondary. It can make the belt tighter if yours is tight to start with it will be worse with it. On stock carts it works fine. It only affects things under 5mph or so then it works like normal. I haul trailers all the time, sand and wood in the box, it helps a lot.

Shepard

OK -- back to the original post --- The first thing I'd check -- do you have a strong throttle return spring? A weak spring or to small of a spring will not shut the throttle tightly. Secondly -- is there free play in the throttle cable when you don't have your foot on the pedal? If no free play the engine could rev when you don't want it to. 3 The cable doesn't have to many tie straps or to many curves or tight bends. Sometimes one's efforts to be neat and clean and all in order can lead to problems in the long run.

Daubers

Thanks for the detailed and insiteful reply! My belt very well may be too tight. Having never done this before I did make it very snug. I will move the engine back some and see how it goes.

So you think plowmans would be better than stock? I will give him a call then. I am fine spending the cash to have it done right, after all the time and money I have into it, just really want to have it up and running for my kids at camp asap.

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Daubers

I actually doubled the throttle return spring from what was provided by Vegas Carts but it still seems week. I had a couple times I had to manually pull back on it bc the engine wouldn't shut down. I will also check the cable play. I am VERY OCD so my cable management is on point and very organized, maybe too much...

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sho305

You should have about 1.5 inches of slack when you press down on top of belt at rest. Cart looks nice found your thread. I like the weapons selector, I need one of those too. Nice cart

Daubers

Haha thanks! The wiring I have into this thing has been crazy. over 400 ft of wiring and over 1000 leds. The "weapon selection" is for a sound board I made that I can load mp3 files onto and triggered by each button into a horn system so it plays 10 different custom sound clips that are really fun for the kids around the campground.

As for the belt. I will lower the tension, as I think you are spot on with that. Do you think I would benefit from new weights and such or just go with a clutch spring? I want to do it right while I have it back home and apart.

Daubers

Is there anything else I should look into having done when I replace the spring? Any other components? I have been doing a bunch more research while I wait for a call back from Don ( and stuck hiding in the basement during a tornado lockdown ) and the umax seems like a very popular choice and gives more low end, my only concern with it not being able to cruise around and lower speeds at camp without having the RPM's too high.