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It'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. NEVER assume they are gapped correctly out of the box. How does the manufacturer know what YOU are going to gap them at?
Here'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. It seems as though the center coil pick up on the ignition module has a wider air gap. Now my question, what is the proper way to measure an ignition module air gap?
Stihl Ignition Module Air Gap... - Arborist, Chainsaw & Tree Work Forum
Things 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 designation of an AC-delco plug denotes an internal air gap to prevent power from bleeding off too soon).
The 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. I tried using a 5' long wood clamp I have to pull the quarters together at the middle of the trunk opening and they wouldn't budge.