Yamaha TT600R Service Manual page 66

COMPRESSION INSPECTION
Pressure under compression:
(after adding oil to the cylinder)
Reading
Pressure higher
than before
Pressure same
as before
Pressure above
maximum value
9. Remove:
•
Secondary fuel tank
•
Pressure gauge (with adapter)
10. Reassemble:
•
Spark plug
See section "SPARK PLUG INSPEC-
TION".
Spark plug:
18 Nm (1.8 mkg)
11. Connect:
•
Spark plug cap
12. Reassemble:
•
Fuel tank
•
Seat
See section "SEAT, FUEL TANK AND
REAR COWLING".
Seat screws:
10 Nm (1.0 mkg)
3-14
INSP
ADJ
Diagnosis
Piston worn or
damaged.
Cylinder head or
piston rings, valves,
gaskets may be
faulty.
Inspect cylinder
head, valve sur-
faces, piston rim to
check for carbon
deposits.