If it works I'm gonna use it.
The camino pulley is shit without a choice in spring tensions.
So I have this gy6 70cc 4t scoot I turned into a standup scoot.
I knew it didn't accelerate fast enough, but never knew why.
Accel often has to do with the rear contra. Too stiff and you get up to speed slow (at least on 4t) regardless of vari weights.
So I checked the spring. Holy cow! So strong!
So I kept trying weaker and weaker springs until I put in the weakest I had.
Finally was zippy. Of course had to lighten the rollers.
Having a tunable rear pulley is imperative to dial in the performance
on any bike, and 2t is even more picky due to a peaky band.