Yamaha BT1100 2002 Service Manual page 68

MEASURING THE COMPRESSION PRESSURE
3-14
Compression pressure
(with oil applied in the cylinder)
Reading Diagnosis
Higher
Piston wear or
than without
damage
oil
Piston ring(s), valves,
Same as cylinder head gasket
without oil or piston possibly
defective
Compression pressure
(at sea level)
Standard:
1,000 kPa (10 kg/cm
Minimum:
900 kPa (9 kg/cm
Maximum:
1,100 kPa (11 kg/cm
a. Turn the main switch to "ON".
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilized.
WARNING
To prevent sparking, ground all spark plug
leads before cranking the engine.
NOTE:
The difference in compression pressure between
cylinders should not exceed 100 kPa (1 kg/cm
1 bar).
7. Install:
• spark plug
8. Connect:
• spark plug cap
INSP
ADJ
Repair
Repair
2 , 10 bar)
2 , 9 bar)
2 , 11 bar)
2 ,
20 Nm (2.0 m•kg)