This mod will work for most variators, even the stock one. You need lighter roller weights/sliders with this mod. The drive face shave
allow you to run lighter rollers or sliders while achieving top end like a heavier roller. It maintains high revs better too. You will need a gram scale and a file to lighten the insides of the rollers/sliders to achieve optimum results. Even .1gm makes a difference when tuning.
I've tried this with both the KN and Polini, ya just have to lighten up the weights.. I run 5.2s in the Polini and 5.3s in the KN. Both will get to 46-47.
I got a request for more info on this, so I thought I would post it up again..... Tests were done in 70+degree weather....
Make sure to do all testing with a new belt
, I prefer the Daytona kevlar sold at Battlescooter or Bowls, or the Kitaco at MX-Performance. Gates belts while very inexpensive, don't seem to perform as well.
If you have a Polini, get the clutch springs, cuz 1-5mph sucks... I didn't like the top speed of 41 I was hitting with the KN before my rev limiter would kick in. The pay off was worth it though, with the KN, the motor revs higher thus keeping your speed up.
I shaved my drive face so the belt would push up higher. You can run 45+ depending on how much tuck you have. My jaw dropped as I saw it go past 45..... I'm now past the LED on the speedo going down hills.... 52? I weigh 220.
I only have a pipe as far as performance goes. KN variator w/5.3 & 5.1 Met Rollers, stock airbox&carb, NO CDI, shaved drive face, Leo Vince unsilenced pipe & a chanito shield.
You can shave
the drive face $25, or the boss drive face $15. Both will push the belt higher up. The only draw back is 0-3mph kind of slow, then kicks in .... The take off of the KN with a stock setup rules. If you use sliders, 0-3 mph rocks! I am using Met Rollers now, and have inverted the face on the shaft to use it as a lathe, I sanded the lower portion of the face so the belt goes all the way down, now it almost hits rev limiter at take off.
Peeps think that a drive face shave
is ghetto, yet I'm rockin 45mph stock. Good enough for my fat ass.
I shaved/sanded a little too much off, so I put a 9/16" machine washer before the variator, so the splines don't get shredded when tightening the final nut. I used a piece of sand paper folded in 4ths and dragged the drive face over it left to right, then up and down. [b]Shave
a little at a time, then re-install and take a ride. Repeat this process until you get 1-4 mph more topend. If you shave
too much, you will need to put an extra machine washer in first before the variator.
Again..... try different combos of rollers, test test test ! And get or make a variator tool if ya don't have one.