Hey guys, so I just bought a huasheng engine kit about a month ago. I just replaced the hoot engine with a grubee g4 which is an awesome improvement. I just put an odometer on my bike and the highest speed i can get on a flat road is 26 mph. Apparently I should be getting to 37 mph which is a huge difference. I ride at 1,083 m above sea level, so I don't know how my carb should be set if that is the problem. Anybody know what I should do?