Roller/slider weight increase By rks (Read 518 times)

[rks]

Due to a nail puncture late last fall, I replaced my rear tire, and put the scoot up for the winter. Even tho I purchased a tire marked the same as the original (120x70x12), it is a little smaller. My first clue came this spring... on my first ride I noticed the engine rpm's were running about 300 more than they used to, at a steady 40 mph. (spend a lot of time at this speed, cruising the country roads). Can't see cranking the engine at 6300 to maintain 40 on a level stretch of road...When I got back, I measured the circumference of the old and new tires....new one is 1.5" less.

To make up for this, and too slow the engine speed down, I have ordered a set of variator weights (14 gram sliders). Currently running 12 gram sliders.

My question is: how much difference does a one gram increase in weight make in rpm's? Looking to trim them by 500 or so...thinking about a combo of 12's & 14's to equal 13.....I know trial and error would answer my question....thought someone here, might be able to save me from having to take things apart twice.....Hill Billy Bob

[Bashan]

Alley explains CVTs

[Alleyoop]

Sliders- For every gram up or down the rpms will change by 200-350
Rollers- For every gram up or down the rpms will change by 500-600

I would not mix the weights 3 and 3 of different weights the problem is there is not enough weight to really get good top end and to get it higher rpms are needed due to 3 heavy and 3 lights. So to get the 3 lights to reach the same spot on the ramp to equal the heavy weights more rpms are required. Also rattling of the light weights will be heard due to the heavy weights pushing out the variator and the light weights will be trailing behind in open space.
Alleyoop

[twowheeler]

SOmetimes theres no choice. I havent seen any half sized Dr Pully sliders.

[Alleyoop]

Your just to lazy to google for them I got hits on my first search:
www.ebay.com/itm/like/260783595362?lpid=82

Alleyoop

[twowheeler]

Ebay? Maybe fake. How come places like scrappy and parts for scooters dont have them? Or any other "real" store.

[Alleyoop]

Then go to DR. Pulley site they have them there. Reason some do not sell them is the cost to them they do not make the profit they want. Don't forget they have to order in some kind of volume and they may sit on their shelf's for years. It is called economics BRO, money talks everything else walks. Do you know that the carbs cost a dealer about 10 bucks each if bought in 50-100 pieces.
Then they sell them to us poor slobs from anywhere from 40-100 bucks SAME CARBS.
Alleyoop

[rks]

May 7, 2014 18:53:26 GMT -6 Alleyoop said:

Sliders- For every gram up or down the rpms will change by 200-350
Rollers- For every gram up or down the rpms will change by 500-600

I would not mix the weights 3 and 3 of different weights the problem is there is not enough weight to really get good top end and to get it higher rpms are needed due to 3 heavy and 3 lights. So to get the 3 lights to reach the same spot on the ramp to equal the heavy weights more rpms are required. Also rattling of the light weights will be heard due to the heavy weights pushing out the variator and the light weights will be trailing behind in open space.
Alleyoop

Thanks Alley, I did look for this info before I posted...didn't find that well written tutorial of yours. I won't mix the weights, looks like the 14's will do what I'm trying to accomplish. Don't really care about top end, rarely do more than 45 mph, just want to calm down the cruise rpm's....thanks again...Bob

[rks]

I pulled the 12 gram, and installed the 14 gram sliders this morning...rpm's at 40 mph have dropped from 6300 to 5700....Mission accomplished....Bob

[Alleyoop]

Nice going good job.
Alleyoop