New to all this. We just finished my son's 80cc motor installation about 2 weeks ago. His friend has same bike and motor (i think). My son's is bogging when throttle is pressed hard and his friends is much faster and responsive to throttle. I noticed my son's use much more gas than his friends. Was thinking his is running rich but my son's exhauat gets much hotter than his buddies. He is running it a little richer for break in. But just seems such a big difference in the 2 bikes when it comes to speed and acceleration. Can anyone give me some advice to tweak or adjust on it?? Thanks guys!!!