150cc gy6 bogging

[mrfartsalot]

I have a go kart with a 150cc gy6 engine it will run great and rev when i have the rear tires off the ground but as soon as i try to drive it it boggs down and doesn't move i cleaned the carb and fixed a small vacum leak and it still does it., Any ideas on what it could be?

[GrizzlyRider]

Is it getting enough gas? what kind of drive system is on it, transmission, belt drive, other?

[mrfartsalot]

@GrizzlyRider the carb is set up within spec, the fuel shut off/pump is working great. it has a cvt clutch with a foreward reverse transmission and chain drive from that to the axle. it was having trouble shifting from neutral or reverse to drive so i opened the trans manually put it in drive and took the shift fork out, but i can easily spin the transmission by hand.

[GrizzlyRider]

so if you aren't getting torque from the engine to move the tranny and it bogs down its air, fuel, spark (engine) related. If you are an the transmission isn't engaging you may have a tranny/clutch problem. If in neutral it revs up without issue, and then you manually put in in drive and it bogs down...someting is up with the tranny holding it back. When in drive does the chain/rear axle move at all?

[mrfartsalot]

@GrizzlyRider it tries to move when it is on the ground but won't when i jack it up so the rear tires are off the ground the tires spin and it runs great

[Ajmboy]

Did you check the belt? Maybe the shift cable needs adjusting.

[fbiondip]

I think you have a variator issue if it runs fine when jacked up and boggs down when sitting on the ground your variator is stuck in high gear mode , a thorough revision on the variator weights and proper belt positioning should solve your problem also check rear clutch spring is in good condition they often brake causing the problem you describe Please keep me posted Good luck!!