yamaha aerox problem??

ive got a aerox 70 LC with 17.5mm carb with 98 jet, leo vinci tt exhaust, malossi variator, 7gram rollers, pm tuning clutch, malossi belt, malossi torque spring.

it starts fine, ticks over fine, goes upto 40mph ok but if i go over 40mph it starts to bog down and lose power, i have to come off throttle and it be fine under 40mph
Can anyone help??? :banghead:

 

8gram rollers?.... am i the only one that thinks theyre a bit heavy?

 

Yeah 8 Gram rollers sound really heavy. Im running the same sort of set up but on a jog rr which is the same engine if im not mistaken and im running 5 gram