katana problems ,, NEED HELP

i have a suzuki katana air, with , malossi iron cast 70cc bore kit , malossi 19mm carb, malossi carbon fiber reeds, dobbler sports tuning air filter, polini kevlar drive belt , polini variator, polini adjustable race clutch ,arrow titanium sports exhaust

the rollers in the variator are the light 1s that u get with it ,and the clutch is set to bite at 5000 rpm


but i cant seem get it passed 26 mph , when my mate had it he had it goin 45mph and that was when it was standard ,when i bought it wasnt working but i wanted 2 fix it up for something to do ,

i need help does anybody know what could be wrong with it , ie clutch not biting at right rpm , or wrong exhaust , weight of rollers


HELP ME

 

whats it revving like? as your going along is it revving low? or revving its tits off?

if you stick it on the stand does it rev the same? or differently?

 

thanks mate , i know the clutch is set at 5000 rpm because its comes set like that , well thats what it says in the instructions , and i just put it in with out changing it

and it reves its tits off on the stand and when im going along it revs high up 2 25mph and stays the same

 

rollers sound too light.

 

yeah like swift said, the rollers sound light.

if the revvs drop off after the clutch clears then the rollers are too heavy if it screams its nuts off all the way then they are too light. try upping the roller weight by a gram and see what happens.