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Update! I got the 10mm adapter for my compression tester. Spinning the engine with a drill to offset the decompression lever I got 90psi.I don't know if this is low for a 4mix.

The 4mix has decompression on the cam gear.If I spin it with a 1/4 impact will it be fast enough to check compression? The trimmer bogs down when it hits heavy grass. I changed carbs, adjusted valves, changed cam gear,I think it may be carbon buildup on the valves or it is just worn...