Yamaha TDM850 1996 Service Manual page 80

COMPRESSION PRESSURE MEASUREMENT
Compression pressure
(With oil applied into cylinder)
Reading
Higher than
without oil
Same as without oil
Compression pressure (at sea level):
Standard:
1,200 kPa (12.0 kg/cm
Minimum:
1,000 kPa (10.0 kg/cm
Cylinder difference:
100 kPa (1.0 kg/cm
Measurement steps:
S Crank over the engine with the throttle wide-
open until the reading on the compression
gauge stabilizes.
WARNING
Before cranking the engine, ground all spark
plug leads to prevent sparking.
S Repeat the previous steps for the other cylin-
ders.
NOTE:
The difference of compression pressure between
the highest and lowest cylinder compression
readings should be 100 kPa (1 kg/cm
less.
7. Install:
S Spark plugs
S Spark plug caps
3-21
INSP
ADJ
Diagnosis
Worn or damaged
pistons /piston
rings ! Repair
Defective ring(s),
valves, cylinder
head gasket or pis-
ton is possible !
Repair
2
, 12.0 bar)
2
, 10.0 bar)
2
, 1.0 bar)
2
, 1 bar) or
18 Nm (1.8 mSkg)