2011 Kingring 50cc JL40QT-4 RPM troubles

[Lefty]

Well that is good that you adjusted the valves but if it is still not getting over 4K only a few things will cause that.
1. Low Compression
2. Something wrong with the Variator
3. Bad CDI

And that is if when you do reach 4K the motor is not backfiring or sputtering or bogging or making sounds.

Let me ask when you crank it up full throttle does the motor make any sounds, BRAT, POP, BACKFIRES?
Or does it just wind up to 4k and runs good at 4K?
Lefty

[Lain]

Originally Posted by Lefty

Well that is good that you adjusted the valves but if it is still not getting over 4K only a few things will cause that.
1. Low Compression
2. Something wrong with the Variator
3. Bad CDI

And that is if when you do reach 4K the motor is not backfiring or sputtering or bogging or making sounds.

Let me ask when you crank it up full throttle does the motor make any sounds, BRAT, POP, BACKFIRES?
Or does it just wind up to 4k and runs good at 4K?
Lefty

when it hits up to 4k it seems to run fine, course the carb noise is alittle hollow, ive been doing adjustments on the fuel mixture, but regardless of that, no sputtering backfiring, the bogging comming from the carb possibly i might toss my stock carb in for a test on that tomarrow but even then that carb couldnt do over 4k either, even when left on the stand and reved the engine and let the wheel spin the Tachometer stays at 4k. and this is with both Stock and the performance CDI i recently purchased.