put the 9oz flywheel weight on the GF bike, major difference. The thing is now it has a bad bog. If you just at ilde and snap the throttle it bogs for a second and then takes off, if you roll it it is fine. Does it need an adjustment on the carb? It already was jetted when bought.
The thing is my GF is still getting use to the bike and I'm not sure if it has been doing this or started after the fly wheel weight was added