The lighter the rollers the higher it revs (in simple terms) but its a little more complex than that, google is your friend for learning about the CVT system.
I recommended the torque spring because it makes the bike respond much more quickly, you know when you slow down and then try to accelerate quickly again and theres like a long delay before it picks up speed again, this minimizes that.
GY6’s with their OHC head are b-o-m-b-p-r-o-o-f, i had one bored and stroked to 230cc which revved to 10,000rpm, my buddy on guam who weighs 220lbs uses it almost daily and has done for about 2 years now!.
In fact i dont think i have ever seen a GY6 blow up during my time tuning scoots in Taichung, even when owned by less inteligent people 
So dont worry.
15g is damn heavy, quite surprised that 13g reacted like it did!.
Do you think the problem could be with the variator and not the weights? Or do you think that they may simply not be too light after all and I was just mistaken about it? I have been googling CVT stuff. From what I read, it seemed like the weights were too light, but I have only been looking into this for the past 1 day so I am still an ultra noob. My only base for comparison was when I had the tranny upgraded on my old forte sv and it felt much different (but that whole bike felt different in almost every way).
Also are there any downsides to that spring upgrade? Like the bike trying to move when idling or anything like that?
Thanks again, you are really helping me out a lot!
Best,
Tyler
No downsides to the torque spring unless you use the 2000rpm which will cause the bike to rev too high (1500rpm is what you want).
It could be the variator you bought, maybe the ramp angle isn’t really good for your setup.
If you had a Yamaha i could fire out a great CVT combo for you over the internet right now and you would be happy, but the local brand scooters arent really my thing so i cant really be of any more help.
I suggest to return it to stock and put 1-2g lighter rollers in along with the torque spring i mentioned… that should keep you happy.
Awesome, thanks a lot! Any idea how to ask for that torque spring in chinese?
Just went to the shop and they switched my 13 gram weights for 14 gram. Honestly not sure which one feels faster, but the 14g don’t seem to rev quite as high. Also I can hear them rev lower as the transmission shifts up at one point while at full throttle. Not sure if that’s a good sign or a bad sign. I can’t honestly tell which one gave better acceleration. Overall the 13g did give the bike a really sporty feel, but the 14g seem more appropriate for a bike I will be riding around town, since it doesn’t scream at 8000RPM while I am going down my street at 20KPH haha. Now the only thing left to do it change that clutch spring. Thanks a lot for your help, SBL!
Oh also, is it ok to use 98 gas in my scooter?
not a good idea, just use regular 95.
The reason it doesnt rev so high is because the weights are heavier.
Did you change the variator back, i found alot of those aftermarket variators didnt work so good with a stock engine.
Nah, I kept the same variator he put on. It seems like it works better than the stock one (plus I already paid for it and I don’t know if they kept my stock one), but if I knew I could have kept the old one I wouldn’t have spent money on the new one. Oh well, live and learn I guess. I have been driving around a bit tonight and I really like the way it feels, so I would definitely say I am happy with it. I do still want to do the spring though. I will have to go to a shop with someone who has better Chinese than me and ask them to do it. Anyway, thanks so much again for all of the help and input.
OK new problem now. This just started happening last night. When I accelerate from a complete stop there is a nasty vibration in the scooter when the clutch engages. This only happens when I am going from a complete stop. Even if I slow down to a very low speed and then accelerate it doesn’t happen; only when I am at a dead stop. It happens when I accelerate at any speed (low throttle or high throttle). Is this a problem with the weights? I don’t really know jack about scooters, but it seems like it is a clutch problem right? They did replace the outside part of the clutch (the bell? Its the part that you can see spinning on the scooter if you take off the transmission cover). Could this be from that “breaking in?” Does it sound like a screw or something just loosened on it? What do you think?
Nasty vibration at low speed as the clutch engages is a sign of a worn out clutch!.
I am giving you a map to WRRP in jung-he, its not too hard to get to from Taipei and they have tons of CVT parts and alot of experience with scooter tuning.
maps.google.com/maps?q=jung-he+t … 14,0,8.13
Yup I just went to a mechanic and it is indeed a worn clutch. F**k I can’t believe that. The bike has 20k KM on it. I never had any problem with my Yamaha clutch even though it was a low end bike that was 10 years old. I can see why you like Yamahas so much more than other brands! How much does a new clutch usually cost? How long are they supposed to last? Thanks so much for the map. I think I will have to make that my new shop of choice, since the other shop that had a great rep missed my clutch problem before.
Also any idea if that shop in jung he is open on sunday?
Just to confirm the shop is that Wu Tan Racing place right?
yep wu-tan and its open sundays, gets busy though!.
In my personal experience with scooters (quite alot to be honest) NOTHING compares to the Yamahas (in regards to the local market bikes).
The transmissions on the yamahas are stronger, engines are much more up-to-date, build quality is better… just everything really.
So the other brands use cheap tricks to sell their scooters to the not so clued up, LCD clocks, crazy lights, aggressive bodywork, fancy sounding names for basic technology etc.
Going off topic here… head to WRRP (i call it werp for short) and get your bike sorted.
Word up; I may have to wait until tomorrow as my gf wants to buy it for my birthday (she seemed pretty happy that something came up that I need so she doesn’t just buy me like 50 bottles of Anchor Liberty Ale haha), but that will def be the place that I go to. If she gets home early enough tonight we will go tonight. It’s open until about 10 right?
Question about the spring. I have been googling it, but I am still not sure which of the springs the torque spring is. Is it the one fat spring that seperated the two halves of the clutch pulley, or a group of three little springs? Also if there is more than one big fat spring, please let me know which big fat spring I want to replace.
Also, since I have been googling, I just want to confirm what the 1500RPM spring is. Does it make the clutch grip 1500RPM later than the stock spring (so the bike will be revving at a higher point in its power band when the clutch grips)? If that is true, does it have any inconvenience to daily driving (make it harder to gently take off as opposed to when I want to blast it from a dead stop)? Will it change the way that my roller weights are working in any way? Does it shorten the life of the clutch significantly (which I guess is only about 20k KM haha)?
Also, the place on my block quoted me at 1500 for a new clutch. Does that seem fair, or do you think I should just wait until I get to jung he?
Thanks so much dude, I can’t tell you how cool it is to have someone to ask about this stuff!
Best,
Tyler
Wait and go to WRRP, $1500 can get you an aftermarket clutch which grips better.
the torque spring is the big spring, the clutch spring’s are the 3 little ones that fit on the clutch, they also come in the same ratings.
here is what the rpm ratings mean i layman terms (for both torque and clutch springs).
1000rpm is stock or there abouts
1500rpm is firmer than stock
2000rpm is even firmer
Dont ever use 2000rpm unless you want to go drag racing!.
got it, so the 1500RPM should grip about 500RPMs later than stock (or thereabouts)?
Also here are my other [annoying] questions (sorry for being a pain in the ass).
Does that wear the clutch down significantly faster?
Is the performance gain decent enough to be worth it (you said it was about 400NT right)?
Will it change the way that the roller weights behave? After trying 13g and 14g, I think my sweet spot is 13.5g, but would that change with the addition of the spring?
How much does a set of new roller weights go for at that place (approximately)?
Thanks again, sir!
oh also I only want the big spring right? Or do I want both?
Sorry one more…I could get there tonight but not until 11. Do you think they will still be open or do you have a phone number I can call to check on that?