72cc polini not running at its full potential

[lolo123]

yep thats what its doing its like riding around quarter throttle the whole time at about 30. I hope thats my problem then i can fine tune from there hopefully

[bakaracer]

your going to need more rollers.that 2k spring is a bit stiff but at least you can see where your at with that spring. I would suggest a 1k or 1.5k at the most. that way you dont eat rollers, belts and risk breaking that rear sheave from heat and stress from the spring.