? RUNNING LEAN OR RICH  By  alleyoop (Read 1,643 times)

Here's a simple Trick of the Trade method to determine if the motor is running LEAN or RICH. It is quick and very Accurate at any Throttle position,WOT, Low Speed, Mid Range etc..


When you notice a Stumble, Back off the throttle a little 1/8-1/4:
1. If it surges ahead your Lean
2. If it stumbles and recovers your Rich

Now depending on where in the Throttle position this happens Different settings have to be done:
1. If it stumbles as your starting off - Adjust your Air/Fuel Mixture
2. If it stumbles in the mid range - Adjust your Needle
3. If it stumbles at WOT - It could be your Air/Fuel Mixture or you may have to Re-Jet.