VintageScooterDude wrote:
I would not buy any CVT bike but a Vespa. I have a Vespa GT200, and a Genuine Stella 2 stroke manual transmission. Way back in 2007, I bought a new Yamaha Vino 125. It performed about as expected on a level road, but trying to climb even a moderate hill it just bogged. I put a clip on (to the spark plug wire) tach on it, and got around 9,000 rpm at full throttle on a level road at an indicated 60 mph. Trying to climb the hill, the rpms dropped and dropped until they were WAY below the powerband. Maybe different rollers would have fixed that, but it shouldn't have been that way to start with. ...
Methinks you have a different username on another forum.
So I have two Stella Automatics, one that now has about 250 miles on it and the other nearly 11K. And my wife has a Vino 125. I think the Vino really does have the wrong stock rollers from the factory, but I actually think this is Yamaha's trying to make it more reliable and get better mpg, maybe even reduce emissions.
Our Vino had 14g rollers stock and I replaced them with 12g sliders, it does not have the poor performance nearly as bad as what you mention. My Stellautos have 9g rollers with the same size engine, but I think they have 1-2 more hp according to the butt dyno. The variator on the Vino is smaller diameter than the Stella's, and my gut physics says that means they would need heavier rollers to behave the same. But the Stellautos are much quicker off the line, and in particular the Stella can easily go with my wife and I 2-up but riding the Vino 2-up is nearly impossible.
I have had both scooters up to 55mph or so, which is about where the top out with me riding them (12g sliders on the Vino). Given enough flat ground I think either of them would probably make 60mph. I might swap the sliders in the Vino to 11g next time I have to do service on it. Likewise, I'll probably change to 9g sliders on the Stella. But suffice to say, I think a Vino 125 with 9-10g sliders would be at least as quick and keep speed like the Stella but probably would give up some top speed.
I will say this: all three of our scooters have been tuned by yours truly. I had to resurrect the not-running Vino with a new, non-stock (but nearly identical) carburetor. It took a bit of fiddling and guesswork to figure how to tune the carb and I think I finally have it very close to right, but getting the idle mixture dialed in so it didn't have a super dead spot off the line and would also idle at the right speed regardless of engine temp was not easy.
I had to also bring back both of the Stellas from storage. The new one was obviously never adjusted from stock and it was extremely lean at idle. Once I tweaked it correctly, it radically improved off-the-line performance. The older one actually feels quite a bit quicker and will even get a little wheelie if you try. I think it's just more broken in, but I might actually have it tuned a little richer than the new one.
So that all said, I think you have to consider how they tune these scooters from the factory for emissions and efficiency, and maybe re-tune them yourself if they don't perform as you expect. Specs tell me my Stellas have a little over 9 hp stock, the Vino is more like 8 hp stock, but the Vino is lighter and should run just about the same if you tune the variator and carb the same. Likewise any other new or used scooter you get probably could use some tuning if it's not performing like you want.