Yamaha 2014 MT-07 Service Manual

ENGINE INSPECTION5-2WARNINGEWA12940To prevent sparking, ground all spark plugleads before cranking the engine.TIPThe difference in compression pressure be-tween cylinders should not exceed 100 kPa (1kg/cm², 14 psi).c. If the compression pressure is above themaximum specification, check the cylinderhead, valve surfaces and piston crown forcarbon 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 measureagain.Refer to the following table.▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲9. Install:• Spark plugs• Ignition coils10.Connect:• Ignition coil couplers11.Install:• Fuel tankRefer 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 coverRefer to “GENERAL CHASSIS (4)” on page4-11.• Rider seatRefer to “GENERAL CHASSIS (1)” on page4-1.EAS31132ADJUSTING THE EXHAUST GAS VOLUMETIP• 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 COadjustment mode of the Yamaha diagnostictool. For more information, refer to the opera-tion manual of the Yamaha diagnostic tool.1. Connect the Yamaha diagnostic tool to thecoupler. For information about connecting theYamaha diagnostic tool, refer to “YAMAHADIAGNOSTIC TOOL” on page 8-36.EAS31133CHECKING THE CYLINDER HEADBREATHER HOSE1. Remove:• Rider seatRefer to “GENERAL CHASSIS (1)” on page4-1.• Fuel tank top cover• Fuel tank cover (left)• Fuel tank cover (right)• Fuel tank center cover• Fuel tank front coverRefer to “GENERAL CHASSIS (4)” on page4-11.• Fuel tankRefer to “FUEL TANK” on page 7-1.2. Check:• Cylinder head breather hose “1”Cracks/damage → Replace.Loose connection → Connect properly.NOTICEECA14920Make sure the cylinder head breather hose isrouted correctly.Compression pressure (with oil applied into thecylinder)Reading DiagnosisHigher than without oil Piston ring(s) wear ordamage → Repair.Same as without oilPistons, valves, cylinderhead gasket or pistonring(s) possibly defec-tive → Repair.T R..Spark plug13 Nm (1.3 m·kgf, 9.4 ft·lbf)Yamaha diagnostic tool90890-032311