Best Variator Rollers For Top Speed

[draven0914]

Hello All I was just wondering what size rollers you all suggest for best top speed.....also how often do the rollers need to be replaced.....

thank you

[Happypancake!]

What scoot ?

[draven0914]

What do you mean by what scoot?..... Do you mean what engine?.... What bore size?

[90GTVert]

Any details about the scoot, specifically what engine, and modifications are useful.

I always advise having a selection of rollers or sliders and doing your own tuning so you can be sure you get what works best for you.


Rollers need to be replaced whenever they start to get flat spots. How long that takes varies, so you need to check periodically. It's a good idea to get in the CVT from time to time anyway and clean it and inspect the parts.

I like sliders instead of rollers. They may offer some performance advantage, but I have found them to be more durable than rollers.

[humanshield]

There is no way to answer your question from what you posted. Is it a 50cc scooter?, 125cc scooter?, 150cc scooter?

Choosing rollers is a tuning procedure. You try different ones until certain conditions are met such as desired acceleration rate and top speed.

Be careful when you buy them, 50cc rollers and sliders are not the same size as 150cc rollers and sliders (if you already knew that, ignore that...some do, some don't)

BUT....for base reference assuming it's a 50cc scooter.....7 or 8 grams is pretty common.

They need to be replaced when they get flat spots on them.   That can vary WILDLY from one scooter to the next depending on a lot of things like how hard you ride it etc.

BUT.....for base reference assuming it's a 50cc scooter....every 1,500 - 3,000 miles (at least check them).   Also if it begins to act funny, like the RPMs stay way too high (wait, or is it way too low?) or if it dies when you come to a stop....check them immediately.

Finally, look at my signature.  It says what I have and what mods I've done.   Do that and it will save you a ton of people asking dumb questions like what scooter you have when you ask for help.

[draven0914]

sorry for my late reply guys my internet was down for some time......I have a 49cc QMB139 Engine 80cc Big Bore Kit installed...

[PirateLabs]

I agree with those that use sliders instead of rollers. I used to use the cheap sliders but about 2 years ago, decided to invest in several different weight Dr. Pulley sliders allowing me to mix and match to get exactly what my scoot needed. They last a lot longer than rollers and other sliders in my experience. Theoretically, they give you a slightly lower "first gear" and a slightly higher "high gear". There are many animations online if you google them to see how this works. (Also posted on this forum in various places) My experience is that they work as claimed but your experience may be different...who knows. On my stock bore 49cc I am running 6.5 gram sliders and I top out at about 8,250 rpm at top end. I take off at about 4,500 rpm so this weight works well for me. It is trial and error and I suggest you get a "test site" where you can make changes, and then run from point A to point B and then make other changes and compare the times and speeds on the same piece of road or course. Brent (90GTVert) has done just this and has many videos posted on Youtube that includes his meticulous record keeping and observations. You will find this very helpful but you still need to tune your CVT on your scoot to your engine set-up, body weight, road terrain driven on, etc. and this also includes the clutch, clutch springs and torsion spring as part of the overall tuning variables along with the variator weights.

Bill

[ratdog]

With a model engine like you have, top speed with come well after full lock up ( I guess most call it “over rev”). Basicly top speed will come after the weights are effecting the gear ratio.. with a little engine ( like stock) you may never get to full lockup, and here the weights will have a lot effect. We have gone to a bit heavier slider (9g) on earsplitingloudenboomer to insure we get a solid lock up. I. Guessing we are producing HP in the top 10% of the guys that build engines on here, so there is zero problem pulling well past full lock up.

That’s sort of a “ your results may very”. IMHO, changing weight will effect how fast you get to top speed, but as long as they are light enough to let the engine get to full lock up ( over rev) they shouldn’t really effect the final top speed.