In Reply to: Re: 8N popping/sputtering at idle posted by Ed Gooding (VA) on May 20, 2026 at 06:03:17:
Thanks Ed. Your post was informative concerning Bruce Haynes' carburetor adjustment algorithm. I performed the procedures as described in the post. I can actually close (all the way in) the idle mixture adjustment needle without any noticeable change in the popping/sputtering/roughness/RPM. If I move the main adjustment needle to 1/2 turn open, as the last step, the RPM drops and if left at that setting the motor will die. I left the main adjustment needle setting 1-1 1/2 turns open. I have considered that there may be an air leak within the intake system altering the air:fuel ratio yielding a lean air:fuel mixture. I am considering replacing the 2 intake manifold gaskets as my next step. If you have further advice/guidance that would be extremely helpful and greatly appreciated.