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Pulled heads. Flattened the face. New gaskets. Re-adjusted valves. Runs fine with LOTS of power. Head must have been getting worse little by little. LOTS of power when mowing. Goes through the tall parts of my lawn without dropping an RPM at full ground speed. Thanks for the advice guys!

Decided to quit overthinking and go old school, quicky diagnostics. Unplugged spark plug from rt side while running. Popping stopped; no change in RPM; actually runs a bit smoother with no spark. Hmm. Unplugged left side, engine stops. Tons of sparkage from HEI test plug on offending side...

According to my shop manual the Command twin engines do not have compression release. "All other models:...are equipped with an ACR." I believe it works through valve timing at low RMP, not an external release. Not sure what the "port" is I'm seeing (a 1/4" nub in the casting), but it's near the...

Slomo: yes was running fine until I bathed her, and before I adj valves. It ran fine for 2 minutes then started popping and losing power. hlw49: There is definitely a shot of hot air coming from the area of the exhaust manifold at the engine every time it pops. I suppose it could be a blown...

SV-725 Courage. Adjusted valves after repairing leaking valve covers. .004/006. Torqued lock screws to 70 in-lb. Washed oil off of engine with garden hose. Covered carb with plastic bag. No forced spray above bottom of flywheel (did not blast coils). Ran fine for about 2 minutes. Started loud...