2-28 PERIODIC MAINTENANCE
CYLINDER COMPRESSION
Cylinder compression:
Standard: 1 100 – 1 700 kPa
(11 – 17 kg/cm
2
, 156 – 242 psi)
Max. difference between any other cylinders:
100 kPa (1.0 kg/cm
2
, 14 psi)
NOTE:
Figures shown are guidelines only, not absolute service limits.
Low compression pressure can indicate one or more of the fol-
lowing:
• Excessively worn cylinder wall
• Worn piston or piston rings
• Stuck piston rings
• Poor seating of valves
• Ruptured or otherwise damaged cylinder head gasket
TEST PROCEDURE
1. Start engine and allow to warm up, then shut engine off.
2. Disconnect all ignition coil connectors.
3. Remove the bolts securing the ignition coil, then remove all
spark plugs.
4. Install compression gauge hose attachment into spark plug
hole, then connect compression gauge hose to gauge hose
attachment and compression gauge.
! 09915-64512: Compression gauge
09915-64530: Compression gauge hose
09915-67010: Compression gauge hose attachment
5. Disconnect remote control throttle cable from throttle lever.
6. Move and hold throttle lever in full-open position.
7. While cranking engine with starter motor, note maximum
compression pressure reading on gauge for each cylinder.
8. Reinstall parts removed earlier. (spark plugs, ignition coils,
etc.)
1
32
1. Compression gauge
2. Compression gauge hose
3. Compression gauge hose
attachment
Throttle lever
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