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Ok that makes sense, thanks for the explanation. Will try that. I was wondering myself if it was a timing issue but couldn't see how that was possible. But if the key sheared off after reassembly that would indeed be another possible culprit. Appreciate the recommendations, thanks Bob.

Thanks for your reply Bob. Yes, it's an 021 with the screw on oil & fuel caps. I used an automotive gauge; didn't realize that'd give a different reading but that's good to know. I did not blast the inside of the carb with high psi. Regardless, to rule out it being a carb issue I removed the...

Picked up an old Stihl MS021 on the cheap and had it running at one point but not smoothly. Wanted to get it fully restored so I took it apart, cleaned the carburetor (didn't look bad, diaphragms looked fine, needle valve too), and cleaned just about every other part with compressed air. Drained...