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All good info I'm in the process of checking valve lash.

Sorry it is a walk behind Murray with a 6hp tecumseh engine. Not sure what year but it does have a solid state coil pack

But if valve clearance was the problem, I would not have compression. Am I correct?

Sounds like a valve problem. I ordered an OEM tecumseh coil pack just to make sure. But I have performed all the above. Anyone have the procedure for performing a valve job?

Yes, I have checked the timing key on the fly wheel . That is still in tact and in good condition.

Recently I was gifted a non running MTD trimmer. When I give it a good tug the engine seems to have good compression. Seems to have good fuel delivery as the spark plug is always wet when removed. Replaced the coil pack with one from Amazon. Spark is nice and blue when gapped at the 20 mark on...