Cylinder Compression - Suzuki DF 90 Service Manual

CYLINDER COMPRESSION

Cylinder compression :
Standard : 1300 – 1700 kPa
(13 – 17 kg/cm
Max. difference between any other cylinders :
NOTE:
Figures shown are guidelines only, not absolute service limits.
Low compression pressure can indicate one or more of follow-
ing :
• 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. Remove STBD / PORT side covers.(See page 7-2)
3. Remove all spark plugs.
4. Install compression gauge hose attachment into plug hole,
then connect compression gauge hose to gauge hose at-
tachment and compression gauge.
09915-64512 : Compression gauge
09915-64530 : Compression gauge hose
09915-67010 : Compression gauge hose attachment
5. Disconnect safety lanyard (switch plate) from emergency
stop switch.
Disconnect the safety lanyard from the emergency stop
switch prior to cranking the engine.
This will prevent any residual fuel discharged from the
cylinders being ignited by a spark discharge from the
spark plug caps.
6. Disconnect remote control throttle cable from throttle lever.
7. Move and hold throttle lever in full-open position.
8. While cranking engine with starter motor, note maximum
compression pressure reading on gauge for each cylinder.
9. Reinstall parts removed earlier. (spark plugs, side covers,
etc.)
2
, 185 – 242 psi.)
100kPa (1.0 kg/cm 2 , 14 psi.)
PERIODIC MAINTENANCE
Throttle lever Throttle lever
2-23