speedfight 2 50cc lc rollers

what weight are the origional rollers for my speedfight? im looking to improve its acceleration would liter rollers help? if so what weight? any suggestions? its totaly standard other than derestriction it dose 45mph but take a while to get there

 

Standard rollers are usually around 8gram I think
What I did was get some 6.5g rollers and use half of them and half of the standard ones, accelerates alot better than all standard or all 6.5