ENGINE
C. ENGINE BODY
a. Checking and Adjusting
1) Compression Pressure
1. Run the engine until warmed up.
2. Stop the engine and remove the air cleaner, the
m u ffler and all nozzle holders.
3. Set a compression tester to the adapter installed in
the nozzle holder hole and fixed with the locating
s c r e w.
4. Pull the stop lever to cut the fuel and run the
engine with the starter at 250 to 350 rpm for 5 to
10 seconds.
5. Measure the maximum pressure while running, serveral times.
6. If the pressure does not reach the allowable limit, apply a small amount of oil to the cylinder wall through the
nozzle holder hole and measure the pressure again.
7. If the pressure raises after apply in oil, check the cylinder wall and piston ring.
8. If the pressure still low, check the top clearance, valve clearance and cylinder head.
NOTE :
•
Check the compression pressure with the specified valve clearance for proper air intaking.
32.4 to 37.28Pa
Factory
33 to 38kgf/cm2
spec.
Compression
469 to 540psi
pressure
25.5MPa
Allowable
26kgf/cm2
limit
398psi
Difference
Allowable
between two
10%
limit
cylinders
