Stihl Ignition Module Air Gap... - Arborist, Chainsaw & Tree Work Forum
Following the instructions in the workshop manual, I set the gap on the lower two metal "pegs" that face the magnets. However, this left the top peg with a huge gap and I couldn't get a spark. The old coil was a Swedish made part (SEM) and all three pegs had more or less the same gap once the lower two were set. It was marked 544 04 70-03.
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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?