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Depends on what your after, mileage or quicker off the line.
Most scooters run fine with factory roller weights.
I swapped mine out with 3- 17 grams DR.Pulley rollers, and 3-20 gram Dr.Pulley sliders, for my 250 cc BR.
It came with 156 grams of rollers, sucked off the line, a long slow climb to 55 mph, then it would get up to 65-70 mph, and then with terrain bounce between 65-75 mph.
BUT I gave up the better gas mileage for the much better jump off the line, and keeping the top end.
My last change will be swapping final drive gears, if I can ever get Polini to answer my emails. That may be the 4-6 mph I need at the top end, when I take the BR for nice long 1500 mile run for a few days.
We'll see, I'm not much of a scooter mechanic, I'm sure others have much better advice for you.
I've been lucky to follow on how other BR owners are tweaking theirs, for every bit of power we can get from them....without machine work.
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