Modern Buddy

What's the difference or are they one and the same? Whichever it is, what function do they perform?

Bill in Seattle but currently wintering in Tucson
'15 170i Hooligan Titanium (AZ scoot)

not to be pedantic, but when these first thit the scene, some folks did some wonderful writeups on this. Do some searching in the tech forum you'll find a wonder.

I personally use 11g in my 150 and they are amazing.

This really has to start with how a scooter CVT works. Here is a good discussion of that.

http://modernvespa.com/forum/wiki-cvt-p ... mprove-it-

Then you can move on to discussing the effect of different roller weights and how sliders differ from conventional rollers.

This is a Union Materials video, bode it does do a decent job of explaining the difference:

<iframe width="560" height="315" src="https://www.youtube.com/embed/yxcQGmT8EJc" frameborder="0" allowfullscreen></iframe>

Several people go with lighter sliders than the original rollers. I went with 18gr sliders when replacing my original 17.5gr rollers. I left the stock spring, so it did move my shift point earlier, but it moved it from the engine's horsepower peak to it's torque peak (7000rpm to 6250rpm), so my off-the line acceleration improved and I felt no need to compensate with a stiffer torque spring.

I've put sliders in two of a friend's Helixes and he saw improved acceleration too. The standard dimension for a Helix roller is 23x18, so I tried sliders for a Big Ruckus which are 24x18. His top speed has improved from 70mph to 74mph.

Thanks for sharing that link Dooglas. Explains everything you need to know, all in one place! I have not seen that before.

Dooglas wrote:This really has to start with how a scooter CVT works. Here is a good discussion of that.

http://modernvespa.com/forum/wiki-cvt-p ... mprove-it-

Then you can move on to discussing the effect of different roller weights and how sliders differ from conventional rollers.

Thanks for that link. It explains a lot that I didn't know including going with lighter rollers when installing a performance exhaust. The author reasons that since the performance exhaust breathes better and takes the usable power band higher up the rev range, using lighter rollers allows the engine to rev up easier to reach that power range more effectively. Have any of you done this and if so, did you experience an improvement?

Bill in Seattle but currently wintering in Tucson
'15 170i Hooligan Titanium (AZ scoot)