XL12 went through the shop this week, customer said hard to start and would not hold a tune. It only had 120 PSI compression and while it passed pressure test, vacuum failed. I was able to replace the crank seals, rebuilt the carburetor, replaced the fuel line & fuel filter, cleaned and gapped the points (or so I thought), replace the resistor plug with the proper CJ8. I was excited to hear it run but alas, not even a solid pop.
I removed the carburetor to see if perhaps there was an issue with the reed valve, gave it a tiny sip of fuel and it acted like a timing issue.
I removed the flywheel (again) and rechecked the points with a more appropriate width feeler gauge and low and behold the gap was well in excess of .020" when it should be 0.015". Reset the gap correctly and the saw ran flawlessly.
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Mark