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Did a search but didn't find anything about my problem. I have a Troy-Bilt TB525CS trimmer/tiller/pole saw. It ran fine a few months ago. Now when I pull to start it, it feels locked up. l removed the plug and it pulls smoothly. The more I screw the plug back in, the harder it is to pull, until it finally won't move. I'm wondering if a valve is stuck shut. Appreciate any comments or suggestions, thanks!

May just be the valves are need adjusting on that AC3 engine.

A compression test will help point to it if reading are too high.

The valve clearance for this engine is 0.003”-.006”(.08-.15 mm) for both valves.

StarTech said:

May just be the valves are need adjusting on that AC3 engine.

A compression test will help point to it if reading are too high.
View attachment 66864
The valve clearance for this engine is 0.003”-.006”(.08-.15 mm) for both valves.

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Great information, thank you!