ENGINE
B1220, B1620, B1820, WSM
1-S10
(EU)
4. CHECKING, DISASSEMBLING AND SERVICING
[1] CHECKING AND ADJUSTING
(1) Engine Body
Compression Pressure
1. Run the engine until it is warmed up.
2. Stop the engine.
3. Remove the air cleaner, the muffler and all injection nozzles.
4. Set a compression tester (Code No. 07909-30208) with the
adaptor to the nozzle hole.
5. Keep the engine stop lever at "Stop Position".
6. Set a compression tester (Code No. 07909-30208) with the
adaptor (Adaptor H, Code No. 07909-31231) to the nozzle hole.
7. While cranking the engine with the starter, measure the
compression pressure.
8. Repeat steps 6 and 7 for each cylinder.
9. If the measurement is below the allowable limit, apply a small
amount of oil to the cylinder wall through the nozzle hole and
measure the compression pressure again.
10. If the compression pressure is still less than the allowable limit,
check the top clearance, valve clearance and cylinder head.
11. If the compression pressure increases after applying oil, check
the cylinder wall and piston rings.
• Check the compression pressure with the specified valve
clearance.
• Always use a fully charged battery for preforming this test.
• Variances in cylinder compression values should be under
10 %.
9Y1210272ENS0014US0
Compression pressure
Factory specification
3.73 to 4.11 MPa
38.0 to 42.0 kgf/cm
2
541 to 597 psi
Allowable limit
2.26 MPa
23.0 kgf/cm
2
327 psi
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