cvt variator rollers By scooterhater (Read 888 times)

[scooterhater]

the ones I have are dealer installed. top speed around 35mph. I weigh 135lbs. going to upgrade. what would be a good weight, not looking for max speed but would like a little improvement

[Bashan]

What is your bike, what engine, and what weight sliders do you have in there?

[scooterhater]

Jul 23, 2014 10:39:51 GMT -6 Bashan said:

What is your bike, what engine, and what weight sliders do you have in there?

sorry I knew better than to leave that out. gmw rx50, 50cc gy6 motor. don't know what weight sliders is in there. 

[Alleyoop]

Well the only way to know if heavier or lighter weights would help is to know what gram weights are in there now. Also take the CVT cover off and see if you already have a performance Variator which is a bigger in diameter. If not you can get a bigger Variator to have the belt climb higher for a few more mph top end speed.
Alleyoop

[Deleted]

Alleyoop,

I had previously read a response of yours where you discussed the best way to choose which weight (slider/roller) was needed based upon hill climbing and scooter load. It was a great idea!

But the idea of increasing the variator size seems like something that could cause a problem without a corresponding reduction in size of the clutch. Without doing that, would it not place greater strain on the belt and therefore wear it out prematurely and or damage the drive components?

[scooterhater]

took variator apart, has 5g rollers. only has 200 miles after dealer install and already showing flat spots on rollers. going to upgrade variator with either hoca or dr pulley. is one considerably better than the other. open to suggestions. will also put on a better belt and keep the gates for a emergency spare

[tvnacman]

I have had good feedback on Koso. I have seen a post or two with people not thrilled with Dr. Pulley . Thry demand a high price too .

John

[Alleyoop]

Jul 24, 2014 8:47:28 GMT -6 bull said:

Alleyoop,

I had previously read a response of yours where you discussed the best way to choose which weight (slider/roller) was needed based upon hill climbing and scooter load. It was a great idea!

But the idea of increasing the variator size seems like something that could cause a problem without a corresponding reduction in size of the clutch. Without doing that, would it not place greater strain on the belt and therefore wear it out prematurely and or damage the drive components?

No, it all works out great, usually the belt in the clutch pulley never reachs the lowest point it can go so with the bigger variator and IF you can get the belt to climb higher you get two benefits bigger wheel in front driver a smaller wheel in back little more top end speed.

[Bashan]

The conventional wisdom is to go 1 gram lighter on the slider than the roller. I thought you already had sliders? John sold me some sliders, I would call or PM him and tell him what you want your bike to do and he's very good about recommending a weight. I got some Kosos from him and they are very good sliders. Rich

[tvnacman]

I have a few variators going out this morning . I expect Monday for delivery guys .

John

[scooterhater]

have a koso variator and rollers comming from john, also gave me some good advice about clutch maintenance. great to deal with

[Deleted]

Scooterhater, were the "flat spots on the rollers" from wear or compression? and are you an agressive or conservative rider?

Alleyoop, have researched a little about Variator sizes and construction. There appears to be conflicting information on sizes. What is the diameter of a stock unit for the 50cc engines and what is your recommended increased size that the original clutch and belt can handle without damage.

have read about Variators that are coated with 'Teflon', since Teflon is known to flake off even on high quality coating like pans, is the Teflon a good or bad idea? Thinking mostly about what I would percieve as a low quality coating based on pricing. OR are there better choices?

[tvnacman]

Package is on the way .

John

[Bashan]

I go with the bare metal variators. The rollers and sliders provide their own lubrication. They are designed for that. You start adding lube either by metal coating or spraying something on the ramp plate, you will change the way it was designed to operate. There is so much gimmick stuff on the market, I tried a lot of it. Most of it is a waste of money IMO. I'll say it again, GY6 engines are fun and relatively cheap to work on. They are also low tech lawn mower size engines. Do you know how many cubic inches 150ccs is? Nine! That's right, nine CID....wooo! Here's one of B&S's smaller lawn mower engines:

It's 190ccs. Don't get me wrong, GY6 engines are cool, but they are not exotic and you won't make them exotic. If you want more power there is no replacement for displacement. You can tweak them and get better hill climbing and maybe a few more MPH. But don't be sucked into the exotic components scams. Some things that work IMO: Variable timing CDI, different torque spring, sliders, different cam, different tranny gears, modest rejet with Uni. Those heads on a GY6 with only pass so much volume. You start loading them up with mega jets and mega air flow and they will not handle it. Just ask Plant, he set his jets back to stock. Teflon variators fall in the gimmick category IMO. Now, did I just make everybody mad? Hey, I could be wrong.....maybe...nah.