what gearing for polini 70cc cast iron?

Should i use primary or secondary gear up kit, for my mbk rovket minarelli vertical ,and also can you use both?

 

reading you sig specs, if set up right a small gear-up ratio will give you more speed and lazy cruising. But with less spec, what tends to happen, is bike isn't too bad in picking up speed, but hit some heavy wind and unless the torque control is set up spot on, the bike becomes a slug. As said, pre-pressed primary gears can be in place and riding in. less than an hour.

As for the whine off the straight cut gears, after 30-40, sounds like a super-charger spooling up.

 

Ive just watched a video of someone swapping out gears, seems pretty simple to do and you can also check the CVT system for wear and change rollers etc whilst its all apart

 

thanks but sorry guys but my 70cc kit aint the sport just your standard ac polini cast iron,my bad should i still go with your advice terro

 

thanks for that terro mate, feel like a right nube now lol,any reccomendations on which brand or should i just go for the cheapest i can find.