Yamaha MT-09 2021 Service Manual page 235

Compression pressure (with oil applied into
the cylinder)
Reading
Higher than without
oil
Same as without oil
6. Install:
• Spark plug
Spark plug
13 N·m (1.3 kgf·m, 9.6 lb·ft)
7. Install:
• Ignition coil
Refer to "CAMSHAFTS" on page 5-16.
• Air filter case
Refer to "GENERAL CHASSIS (2)" on
page 4-10.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Fuel tank center cover
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
• Rider seat
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
Diagnosis
Piston ring(s) wear or
damage → Repair.
Piston, valves, cylin-
der head gasket pos-
sibly defective →
Repair.
ENGINE INSPECTION
5-8