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2-3 BREAK-IN OPERATION
A new engine or an engine that has been completely overhauled by being fitted with a new
piston, rings, valves and connecting rod should be thoroughly RUN-IN before being put back
into service.
Good bearing surfaces and running clearances between the various parts can only be
established by operating the engine under reduced speed and loads for a short period of time.
While the engine is being tested, check for oil leaks.
Make final carburetor adjustment and regulate the engine operating speed.
2-4 ENGINE SPEED ADJUSTMENT
High-speed side ; Engine speed is varied by the equipment, so adjust the speed to the specified one
indicated on the equipment.
Low-speed side ; Adjust the engine speed to 1,400 rpm by the carburetor idle screw, and then adjust to
1,600 rpm by adjusting screw of governor base plate.
Time
Engine Speed
Load
Step
Step 3
Step 2
Step 1
No Load
No Load
No Load
10 min.
2,500 rpm
10 min.
3,000 rpm
10 min.
3,600 rpm
