hi i have a gillera stalker , im now running a polini sport 70 kit as i blew up a parmakit , i run a 19mm tnt carb and a zx pipe all was running great then i fitted a polini high speed variator it came with 6.9 gram rollers which i left out and fitted some 5grm rollers which i ran in the standard variator , the bike tends to rev higher but splutters off the bottom and takes alot longer to get to top speed , ive read the guide on rollers but still would like some advice on which way to go , heavyer or lighter
