Blaster will haul first three gears. 4th it'll run but bogs them 5th just bogs. I had changed the main jets a few times with no luck and had another guy helping me but he couldn't figure it out. Finally took it to a shop and they said my compression was all over the place and that's causing the issue but I don't see how that affects high gear.. my blaster has no airbox someone cut the airbox out of the rear plastic completely. It has a full toomey b1 exhaust. V force 3 reeds. That shop it was at did replace my carb with another one which seemed to improve it some. I just can't seem to figure out what is wrong with it... any help would be greatly appreciated.