Check and Adjust Valve Clearance ProcedureUpdated a year ago
Check and Adjust Valve Clearance Procedure
The engine intake and exhaust valve clearance should be checked and if necessary adjusted every 300 hours of use or 12 month period, whichever comes first. 
⚠ CAUTION: If the valve clearance isn’t maintained, this can cause the engine to run less efficiently and potentially cause engine damage.
Step 1.) Remove spark plug cap
Remove valve cover Remove spark plug Pull on spark plug cap to disconnect spark plug from ignition wire. 
Step 2.) Remove valve cover
Remove all 4 valve cover bolts with a 8 mm socket wrench and remove the breather hose; then remove the valve cover. 
Step 3.) Remove spark plug
Remove the spark plug with the provided spark plug wrench. 
Step 4.) Set valves to top dead center
Place screwdriver into spark plug hole to help determine the position of the piston, then slowly pull the recoil rope until the piston rises to the top position and both valves are closed (compression step). 
Step 5.) Check intake valve clearance
The intake valve is on the right side of the cylinder head. Slide a 0.005” ± 0.001” (0.125 ± 0.025 mm) feeler gauge in-between the valve head and rocker arm. If the feeler gauge is too loose, then tighten the rocker nut until the feeler fits firmly in the gap; but not too tight that you can’t remove it. If the feeler doesn’t fit in the gap, then loosen the rocker nut until feeler gauge fits firmly inside the gap. 
Step 6.) Check exhaust valve clearance
The exhaust valve is on the left side of the cylinder head. Slide a 0.007” ± 0.001” (0.175 ± 0.025 mm) feeler gauge in-between the valve head and rocker arm. If the feeler gauge is too loose, then tighten the rocker nut until the feeler fits firmly in the gap; but not too tight that you can’t remove it. If the feeler doesn’t fit in the gap, then loosen the rocker nut until feeler gauge fits firmly inside the gap.
Step 7.) Reinstall parts
Reinstall the valve cover, spark plug, and ignition coil wire. The valve cover should be tightened to 7.4 ft/lbs ± 1.5 ft/lbs (10 ± 2 N·m). The spark plug should be tightened to 16.2 ft/lbs ± 1.5 ft/lbs (22 ± 2 N·m).
