The variator boss on my standard variator is 20mm x38mm and I was thinking of changing it for a 20mm x 36mm. Has anyone tried this? I can see that my belt dosen´t travel all the way up the variator face and thought that by reducing the distance between the pulley wheel and the variator face, I´d get the belt to travel all the way up and therefore get a better top speed or, with lighter rollers get better acceleration without loosing anything from the top speed . Cheers
If you do that the pulley fan face will be too far away from the kickstarter and it wouldn't engage, also the belt wouldn't be properly ligned, not sure to what point that affects anything tho. If it doesn't travel all the way up, maybe the contrast spring is too strong?
With the bike on full revs, does it not reach the top of the variator pulley? Might take a few seconds to get there but it should be more or less flush with the top on the front and right down the bottom on the back. That's the position where top speed is achieved. As brgil96 says, could be that the spring is slightly too strong, or the carb main jet is a little too small, stopping the engine producing peak rpm.
I can simply shim behind the roller ramp plate so the distance to the kick stand cog will still engage.
The contra spring is the same as when I bought it, I have´t changed anything concerning the clutch. The reason I know that my scooter can perform better, is because before I changed my variator it was simply running better. As I said earlier, I can physically see that the belt doesn´t travel to the top of the variator. Next time I have my cvt case off (maybe tomorrow) I´ll take some pictures to highlight what I´m talking about.
Then there is a difference in the variator performance from the previous one. What variator did you buy? What size and weight are the rollers? And same questions for the 'old' variator. Whats the difference.
Hi Steve, I´ve no idea what make or brand the old variator is but it used 15x12mm rollers and on weighing them I discovered them to be an average of 4.72g ( I know this isn´t a standard weight but after possibly years of ware I could imagine they started life as 4.75 or my best guess is 5,0g). The new variator I bought uses 16x13mm rollers and the one´s which came as standard were 8,0g. I did discuss this with the shop, and pointed out that 6,5g are standard for a neos 50. I could see on the back of the package that the item was for a Yamaha Jog but they assured me that this would be the same for my neos. The new variator is teflon treated and made by(or for) a company called SP scooters. The face of the variator (the part that holds the rollers) is a blackish/dark gray colour and has obviously been treated with something. I think it was Merlin that pointed out, that the teflon coating would be inside the variator and not on the face of it, even though the shop told me, when questioned about this, that this was a teflon coating of some sort. I originally aired my concern to them, stating that the coating looked like it might damage my belt but they assured me they had sold plenty of them with no come backs in this area. I can see definate signs of heavy ware on my Polini kevlar belt which is only 2 months old. The ware is ONLY on the side which makes contact with the coated variaator face. I´m pretty certain that my initial feelings are being confirmed, that is to say I shouldn´t have taken the chance buying something I couldn´t find anything about on the internet. I seriously considering buying another one from a reputable dealer over the internet. I´ll present my case to the head office of the shop where I bought it from and see if I can´t get my money back. I´m very disillusioned by this shop, I´ve used far too much time and effort on buying the completely wrong products by no fault of my own .
yes, i've seen those variators with the coated face, apparently its supposed to help with grip on the belt and reduce slipping during acceleration. But i did wonder about whether it would rip the contact face of the belt itself. I had a feeling the roller sizes and weights would be different with the new variator as i've looked at a few for myself and noticed they are all supplied with 16 x 13 8gr rollers. They are way too heavy for 50cc scooters, 125's yes but not 50's. If i was you i would temporarily drop back to the old variator for now, try and get your money back from the shop, and find a compatible one with the same size rollers, or buy a branded variator and specify the lighter rollers as an option.
Sorry I´m a bit slow on getting back to you Steve, thanks for the info and advice. I have had a chat with them and I think I´ll be able to get my money back. They want to see some pictures of the damaged belt. I´ve actually changed the belt with another one and it seems to be running quite well, time will tell if the coated face has worn itself down on the kevlar belt and become less aggressive. I´ll check it again in a week to see if it´s knackered that one as well.
Not a problem on the slowness jools, been mad busy myself this week, not got on here as much as i would have liked. Has the belt change made any difference to the top speed at all?
Hi Steve, now that I´ve changed the belt, I´m finding that things are running normal again. My top speed on the flat is between 50 and 55 km/h which is fine for me. I´m going to check my belt again in a few days to see if it´s worn like the kevlar one. My new issue, regarding this variator, is I´ve got flat spots on my rollers . I´ve probably ridden about 600k´s with them and I´m totally puzzled. I can´t really see any reason for it except that they have sold me the crappiest rollers available. If you´ve got any ideas why this should happen, then I´d be very grateful if you could let me know. Cheers, Jools by the way,I´m working on getting a totally different variator from them for no extra charge or at least my money back for the dodgy variator, the extra rollers I´ve had to buy and the new belt I´ve had to buy.
Small flats aren't much of an issue, it's when they get HUGE they become a problem. Cheaper rollers will get flats really quickly, best buy higher grade rollers with a new variator in the long run. Although saying that, finding out what materials they used on them is an absolute pain. So little info on it all. But nice to hear that it's back to where it should be performance wise, and also the beating of the shop is great to hear. Some places just sell you crap because they think you know nothing about what you are doing, and expect you to accept it, thereby forcing you to an incorrect conclusion on the problem and causing you to go back to the shop to buy more stuff you didn't need in the first place if the problem had been correctly diagnosed. See.......you set me off on a rant. Rant over.............back to work
