Modern Vespa

Just installed 12.5 dr pullys pn my 250 removed the 10.5 dr ps after 5000m. Should i get a higher top speed or a quicker line start now??

No, not really.

10 gr is the sweet spot for the 250 in 21 x 17mm.

I run 9gr in my bike with the Malossi head and upgear.

Those 12.5 gr weights will keep your RPMs lower, out of the good power band, IMHO.

Good luck with it.

R

Yes, no, maybe and perhaps. The problem with roller tuning is that people are looking for a one size fits all, if I do this, this happens, approach. Heavier rollers will often give a higher top speed, but if your motor is tuned, you want to find the rollers that give you the most speed in the power band of your particular motor. If your motor doesn't have the power to pull heavier rollers higher, you will get a higher top speed with lighter rollers. As far as launching, you adjust that via the clutch more than via the rollers. You want to set up your clutch to launch you quickly, usually by going to a slightly heavier set of springs, and find the rollers tht work with your weight and the way your bike is set up to give you the highest top speed. If you weigh 500 lbs, you are going to need a different setup to get top speed out of your bike than a jockey, for instance. If you aren't happy with the new sliders, try half and half, and see if that gives you the best of both worlds. In the ideal world, you would have about four or five different weights of rollers, change them, ride it, see what you think, repeat until you are happy. It takes a while, but in the end, you have the perfect setup for you and your scooter.

I have a remus exhaust with supercorsa powerbooster and malossi HF air filter. Just trying to get an idea of what to expect. Im sure in 5000 more I'll be trying a new variator.