reverse upgrades

[ravena79]

hey, I have a 2002 NG BWs. I have a 70cc T6, everything else is stock. I was wondering, if I get the stage 1 kit now, what rollers and springs should I use? Montreal has a pretty varied terrain(lots of hills, lots of flat too), and I weigh 170 + whatever junk's in my backpack or in the seat compartment. ::handleba

[Zuma-Zuma]

Same as you would the stage 2, which is what you end up with almost minus the carb. I would try yellow first on the clutch springs. The variator should come with a set, try them first. Depending on what variator you get, and depending on what torque spring you get, will determine final roller weight.

[ravena79]

Just a ballpark figure kinda guess, how long does it take to get the crankcase open, take the variator out, change the rollers and put it back together? Mostly I keep asking what may seem like obvious questions 'cause I don't want to spend more time fiddling with the scooter than riding it... :D

[Zuma-Zuma]

20 minutes, if that. I used my electric Milwaukee drill, with a hex bit. Side cover-remove the hex head machine screws. Don't even have to take the kickstarter lever off. Once off, the variator is right there. Remove the nut with an impact gun, and it slides off. I can change rollers in less than 10 minutes.

If you want to mod anything, you're going to learn how to fiddle. We call it tuning. Its a trial-and-error process.

[ravena79]

thanks for the estimate, just wanted to know.
So, yellow clutch springs are the midrange street springs, that affects low-end accelerations... what is the effect of different strength variator springs? and how would that affect which rollers I need to use? stock weights are 7.0 grams I think...

[burnt_toast]

Just a ballpark figure kinda guess, how long does it take to get the crankcase open, take the variator out, change the rollers and put it back together? Mostly I keep asking what may seem like obvious questions 'cause I don't want to spend more time fiddling with the scooter than riding it... :D

Once you do it a few times, you get real used to it.

Fastest so far for me was 7min in my backyard in some hot Texas weather. :8wave:

Best tool to have is biggest size channel locks. safer than a torque wrench and even quicker once you get used to it. as for what size you'll need, you will just have to experiment.. it takes time and lots of testing. But having said taht, I'd shoot for 4-5g, but it all really depends on your setup.

[Zuma-Zuma]

Clutch springs will let the motor wind up before the clutch engages. It will hit hard, and keep the motor rev's up while pulling. The variator rollers, or weights will do a few things, but need to work with what ever torque spring you are using. This would be the giant spring behind the clutch. Lighter roller weights will usually help with bottom end take off. A little heavier, and it will add some top end, at the cost of some bottom end. But rider weight, and your riding conditions will dictate the weights required. If you have a lot of hills, you may want a lighter roller.

[ravena79]

and how does torque spring strength affect the ride?

[raburns]

The torque spring controls the movement of the secondary pulley and how long the secondary spring keeps the belt in the upward position. Sronger spring will keep th belt higher on the pulley longer giving you a lower gear ratio ( more acceleration). It doesn't affect the ride. Its not part of the suspension.

[Zuma-Zuma]

It also helps the vario "reset" the rollers. Kind of like down-shifting.