Yamaha 2014 MT-07 Service Manual

ENGINE INSPECTION
5-2
WARNING
EWA12940
To prevent sparking, ground all spark plug
leads before cranking the engine.
TIP
The difference in compression pressure be-
tween cylinders should not exceed 100 kPa (1
kg/cm², 14 psi).
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits → Eliminate.
d. If the compression pressure is below the min-
imum specification, pour a teaspoonful of en-
gine oil into the spark plug bore and measure
again.
Refer to the following table.
▲▲▲▲ ▲ ▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲▲▲▲
9. Install:
• Spark plugs
• Ignition coils
10.Connect:
• Ignition coil couplers
11.Install:
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
• Fuel tank front cover
• Fuel tank center cover
• Fuel tank cover (left)
• Fuel tank cover (right)
• Fuel tank top cover
Refer to “GENERAL CHASSIS (4)” on page
4-11.
• Rider seat
Refer to “GENERAL CHASSIS (1)” on page
4-1.
EAS31132
ADJUSTING THE EXHAUST GAS VOLUME
TIP
• Be sure to set the CO density level to standard,
and then adjust the exhaust gas volume.
• To adjust the exhaust gas volume, use the CO
adjustment mode of the Yamaha diagnostic
tool. For more information, refer to the opera-
tion manual of the Yamaha diagnostic tool.
1. Connect the Yamaha diagnostic tool to the
coupler. For information about connecting the
Yamaha diagnostic tool, refer to “YAMAHA
DIAGNOSTIC TOOL” on page 8-36.
EAS31133
CHECKING THE CYLINDER HEAD
BREATHER HOSE
1. Remove:
• Rider seat
Refer to “GENERAL CHASSIS (1)” on page
4-1.
• Fuel tank top cover
• Fuel tank cover (left)
• Fuel tank cover (right)
• Fuel tank center cover
• Fuel tank front cover
Refer to “GENERAL CHASSIS (4)” on page
4-11.
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
2. Check:
• Cylinder head breather hose “1”
Cracks/damage → Replace.
Loose connection → Connect properly.
NOTICE
ECA14920
Make sure the cylinder head breather hose is
routed correctly.
Compression pressure (with oil applied into the
cylinder)
Reading Diagnosis
Higher than without oil
Piston ring(s) wear or
damage → Repair.
Same as without oil
Pistons, valves, cylinder
head gasket or piston
ring(s) possibly defec-
tive → Repair.
T
R
.
.
Spark plug
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
Yamaha diagnostic tool
90890-03231
1

Yamaha 2014 MT-07 Specifications

General

Engine Type	Liquid-cooled, 4-stroke, DOHC, 4-valve
Displacement	689 cc
Bore x Stroke	80.0 mm x 68.6 mm
Compression Ratio	11.5:1
Maximum Torque	68.0 Nm (6.9 kg-m) @ 6, 500 rpm
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	Constant Mesh, 6-speed
Final Drive	Chain
Front Suspension	Telescopic forks
Front Brake	Hydraulic dual disc, Ø 282 mm
Rear Brake	Hydraulic single disc, Ø 245 mm
Front Tyre	120/70 ZR17M/C (58W)
Rear Tyre	180/55 ZR17M/C (73W)
Dimensions (L x W x H)	2, 085 mm x 745 mm x 1, 090 mm
Seat Height	805 mm
Wheelbase	1, 400 mm
Minimum Ground Clearance	140 mm
Wet Weight	179 kg
Fuel Tank Capacity	14 L
Maximum Power	74.8 PS (55.0 kW) @ 9, 000 rpm
Rear Suspension	Swingarm (Link type suspension)