Cylinder Head and Valves
PERFORM ENGINE BREAK-IN
1. Run engine at slow idle no load for 1 minute. Check for
fuel, coolant, and oil leaks.
2. Increase RPM to fast idle, then load down to 50 rpm
above rated speed for 10 minutes.
NOTE: Dynamometer is the preferred load control, but
engine can be loaded by matching drag loads to
3. Recheck valve clearances and adjust as necessary
after engine cools. (See CHECK AND ADJUST VALVE
CLEARANCE, earlier in this group.)
4. Install rocker arm cover. (See INSTALL ROCKER ARM
COVER earlier in this group.)
Retorque of cylinder head cap screws after engine
break-in is not required.
IMPORTANT: After engine break-in, follow ALL
recommended hourly service intervals
outlined in your operator's manual.