Whats a good combo of clutch springs and variator sliders  By  djmiranda1 (Read 10,256 times)

Hi There,
It all depends on how you ride, long stretch of open road or stop light to stop light or stop signs in the city, or hilly area where the scoot looses a lot of mph going up.

Also what are you looking for, a little more top end speed or more get up and go from start etc..
Alleyoop

You can set it up to get descent top end and descent pick up like you say a middle ground setup.

Clutch Springs:
Stronger Clutch springs require higher rpms more Centrifigual Force before the Clutch pads get thrown out to grab the bell which turns the wheel. If your familiar with a car with a clutch think of it as putting the clutch in and revving the motor up then popping the clutch.
So when starting off if right now the Scoot starts to move say when the RPMs reach 2500 and you put in 1000 rated Clutch springs you add the 1000 to the current 2500 rpms and now your scoot will not start to move until the RPMS reach around 3500 rpms. They have 1000, 1500 and 2000 rated Clutch springs.

Now if your used to riding around town streets just cruising around 20--30 mph your rpms will be higher than they currently are. It is all about RPMS .

Now to get a little more top end speed you can get a Performance Variator which are a little bigger in Diameter than the OEMs. The deal here is a BIGGER WHEEL(bigger Diameter Variator) will turn a smaller wheel more rotations(when the Belt goes down on the CLUTCH pulley creating a small wheel) there by turning your Rear wheel more revolutions.

But in order to take advantage of the bigger VARIATOR you have to get the belt to climb up that added diameter.
That you can do by adding heavier weights to close the Variator pulley more to push the belt up. Also you need to Match the RPMS with it as well otherwise with not enough RPMS the belt will not climb that high and you may loose top end.
So it is a Trial and Error process and it depends on your motor as well how strong it is. To heavy of weights will drop your rpms and to light of weights will raise your rpms but may not push the belt up high enough.

If its a 50cc most folks run 5-6 gram weights, if its a 150cc anywhere from 11-13 gram weights.
Alleyoop

Alley,
Thanks for the break down

Ramblin,
What are you running? My wife would flip out if I added a tach to her scoot... I think Im just going to buy some 5 gram slider weights and new variator. I'll go from there...

Whats the difference between slider and roller? Is one better then the other?

From what I've been reading its kinda trial and error. I thought I was going to be able to just buy 5/ 6 gram sliders or rollers and just be done with it. I guess not. Thanks for all the info.

I'm really considering, just to try, buying the round/cylindrical Dr. Pulley weights. I'd really like to see how major of a difference it is for how long they last before developing major flat spots.

i'm using three 6 gram and three 8 gram rollers. what works for one isn't necessarily going to work for you though. Alley talked me into getting a tach and i am very happy that i did.
it was very easy to install. only about the size of my thumb with a digital display. well worth the 30 bucks (IICR).

First you should remove and weigh your rollers to be a starting point . My lil 4T 50 had 8g rollers and I went with 5g rollers which helped on take off and uphill with the same top end . The 1k , 1.5k and 2k clutch springs can help on initial take off since they require higher RPMs to engage . Some replace the torque also called contra spring behind the clutch assembly to help it go up hill better . A performance variator is of larger in diameter and may have steeper ramps for the weighs to move upon . Here is a tuning kit with many diff weights to try enviromoto.ecrater.com/p/14177743/prima-roller-weight-kit-16-x-13 These are for testing purposes and may not last as long as others . Sliders do perform much better and last longer . I have Dr Pulley sliders in both of my scoots . Many like Koso sliders and variators .

A size or two larger main jet in the carb will help it run better as they come too lean and need to be richened up some .

Too light may loose top end just as too heavy may kill take off and uphill . It is easy to tune ether way , but I like to tune for midrange . Even .5g will make a diff in the weights . I would replace the belt with a Gates Powerlink or Bando since some come with a crappy belt that does not last as long as those do .

When looking for parts search by " 139QMB " which is the engine type used in the 4T 50s in the China scoots instead of by brand and model of a China scooter . The best way to get more power is a BBK or 80cc crate engine . Here is some performance goodies www.scrappydogscooters.com/139QMB_50cc_Performance.html