Hey, I will explain the best I can. While the helix is in N it revs just fine. Once in drive it will bog down and loose power. On the low side it's fine pulls hard great starts just after you get to about 20 mph let off gas RPM's drop power comes back.
Buggy is sportworks Helix GY6 150cc
Mods: Uni, new carb w/130 jet, cdi box, coil, plug, yellow spring, performance clutch.
Here is the video
https://youtu.be/hAtZaQXBoGI
Thanks in advance!!