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1200~1300 RPMs, have you done the pilot jet screws? If so you just need to dial those in properly

Warm it up, turn 1 side pilot screw in until the rpms drop, then back out till RPM's peak (and no further)* Twist throttle...see how it reacts...tweak to taste.
Repeat on other side... test ride. You're looking for best throttle response and transition from just cracked to 1/4 throttle opening or so.*

Also check for any vacuum leaks, and all the carburetor boots are installed properly.

Thats a quickie, 10 cent tutorial on setting pilot screws.**
 
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