Jun 12, 2005here's the problem, the stihl setting gage seems to set the air gap too tight, like 0.004" measured between the ignition module arms and the flywheel magnets using a feeler gage set. Apr 12, 2018it's sop to inspect & gap new spark plugs to your desired gap before installing them. They could have been dropped, thereby changing the gap, etc.
Dec 3, 2020closer gap and/or faster speed = higher induced voltage. Apr 22, 2017things that determine resistance is the plug wire conductor (metal conducts better than carbon impregnated fiberglass strands), the spark gap, and the resistance in the plug (the r in the. Feb 17, 2025the deck lid is slightly curved as well but probably only has about a 1/32nd gap in the middle, but combined with the 1/8" gap on the quarter it causes a noticeable problem.
Sep 2, 2008the key is, if the compression ratio goes up, drop the gap down. Gm made a real mistake with hei performance during their oldsmobile years, they specified a spark plug gap of .060, and. Sep 27, 2015if the gap is greater than .187” install a .060” flat washer between the torque converter and flexplate.
Jan 15, 2006the plug gap is a little small for that mild of a motor. Apr 16, 2023rule of thumb for a naturally aspirated engine 0.004" gap per inch of bore so in your case you should shoot for 0.016-0.017" (4.155 x 0.004) ideally. If your gap is 0.032" you probably don't.