gy6 50cc cvt cover limiting speed

[extremepowdercoaters]

Well to make a long story short i just finished a 100cc big bore on my girls scoot as i have done to lots of scooters. here is my issue and i puzzled. her scoot used to go 40-42 with stock 50cc. I did the 100cc kit and she hits 35-38 mph before hitting the limiter and she was running a ncy cdi. i now tried 3 cdi / carb / coil / fuel filter and now i was left only with a possible cvt system issue. i installed 8g rollers like always and i used the same gates belt she had in there. i have found if i remove the cvt and run the motor out it screams and never hits the limiter. soon as i re install the cvt cover it will rev out half the rpms and hits the limiter. i used a different cvt cover off another bike and im getting the same issue. what the heck lol. anyone have this issue before? Thanks Josh