My bike runs fine and has good power for about 10 minutes but then when I start climbing hills or riding for a long amount of time it starts to lose a lot of power and I have to start pedaling with the motor. When I stop and let it idle it'll start to rev up high but the revs rise and fall a little. Then when I try and hit the kill switch it starts dieseling and refuses to shut off. I've tried adjusting the c-clip in the carb all the way up and down but it still does it.