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14) Inspection of Compression Pressure
1. Start the engine to warm up for 5 minutes, then stop the
engine.
2. Shift the gear into the Neutral (N) position.
3. Remove lock plate (stop switch lanyard) from stop switch.
6. Fully open the throttle and crank the engine until the
compression gauge indication stabilizes, then measure the
compression pressure.
7. If the compression pressure is below the specified value
or varies a lot among the cylinders, pour a small amount of
engine oil into the cylinders and perform the compression
test again.
Clean the areas around the spark plugs
on the cylinder before removing the spark
plugs to prevent dirt from entering the
cylinder.
Compression Gauge 1:
P/N. 3AC-99030-0
Compression Pressure (Reference): at 500 r/min
with decompresser : 0.50 MPa (73 psi) [5.1 kgf/cm
²
]
without decompresser: 1.40 MPa (203 psi) [14.3 kgf/cm
²
]
•
If the compression pressure increases after the
above measure, check the pistons and piston
rings for wear. Replace if necessary.
•
If the compression pressure does not increase
after the above measure, check the valve
clearances, valves, valve seats, cylinder
sleeves, cylinder head gasket and cylinder
head. Adjust or replace if necessary.
Remove lock plate (stop switch lanyard)
from stop switch before measuring
compression pressure. This will prevent
engine from accidental starting.
4. Remove all plug caps and then all spark plugs.
5. Install the compression gauge 1 into the plug hole.
•
Compression pressure is greatly affected by the
cranking speed, and normally varies by about
10% to 20%.
•
For remote control model: Remove the cable
joint and fully open the throttle cam with your
hand, then measure the compression pressure.
A Basic Tiller Handle Model
B Multi-Function Tiller Handle Model
C Remote Control Model
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