Quick & Dirty Tuning Diagnosis
Here's a general guide to troubleshoot the most likely problem when your GY6 stumbles while riding.
When you notice a Stumble, Back off the throttle about 1/4 turn.
1. If the RPM's surge, you are running Lean
2. If it hesitates for a moment, then recovers, you are running RichÂ
Based on Throttle Position, different adjustments need to be made:
1. Stumble as you first crack the throttle open = Adjust Air/Fuel Mixture
2. Stumble in the mid range = Adjust the Needle height
3. Stumbles at WOT = Re-Jet.