Yamaha Fz6n Manual
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3-24 CHECKING THE SPARK PLUGS / MEASURING THE COMPRESSION PRESSURECHK ADJ 18 Nm (1.8 mkg, 13 ftlb) NOTE: NOTE: 7. Install: spark plug spark plug caps Before installing the spark plug, clean the spark plug and gasket surface. 8. Install: radiator lower hose bracket bolt radiator lower bolt EAS00065 MEASURING THE COMPRESSION PRESSURE The following procedure applies to all of the cyl- inders. Insufficient compression pressure will result in a loss of performance. 1. Measure: valve clearance Out of specification Adjust. Refer to “ADJUSTING THE VALVE CLEAR- ANCE”. 2. Start the engine, warm it up for several min- utes, and then turn it off. 3. Remove: rider seat Refer to “SEAT”. front cowling inner panel (letf and right) Refer to “COWLINGS”. fuel tank Refer to “FUEL TANK”. air filter case Refer to “AIR FILTER CASE”. battery Refer to “CHECKING AND CHARGING THE BATTERY” in chapter 3. battery box battery box bracket Refer to “BATTERY BOX AND BATTERY BOX BRACKET”. heat protector plate 4. Remove: cover ignition coils spark plug caps spark plugs
3-25 MEASURING THE COMPRESSION PRESSURE CHK ADJ CAUTION: WARNING NOTE: Before removing the spark plugs, use com- pressed air to blow away any dirt accumu- lated in the spark plug wells to prevent it from falling into the cylinders. 5. Install: compression gauge 1 adapter Compression gauge 90890-03081, YU-33223 Adapter 90890-04136 6. Measure: compression pressure Out of specification Refer to steps (c) and (d). Compression pressure (at sea level) Minimum 1,350 kPa (13.50 kg / cm 2, 13.50 bar, 191.87 psi) Standard 1,550 kPa (15.50 kg / cm 2, 15.50 bar, 220.46 psi) Maximum 1,736 kPa (17.36 kg / cm 2, 17.36 bar, 246.92 psi) a. Turn the main switch to “ON”. b. With the throttle wide open, crank the engine until the reading on the compression gauge stabilizes. To prevent sparking, ground all spark plug leads before cranking the engine. The difference in compression pressure be- tween cylinders should not exceed 100 kPa (1 kg/cm 2, 1 bar, 14.22 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.
3-26 MEASURING THE COMPRESSION PRESSURE CHK ADJ 18 Nm (1.8 mkg, 13 ftlb) d. If the compression pressure is below the minimum specification, pour a teaspoonful of engine oil into the spark plug bore and mea- sure again. Refer to the following table. Compression pressure (with oil applied into the cylinder) ReadingDiagnosis Higher than without oilPiston ring(s) wear or damage Repair. Same as without oilPiston, valves, cylinder head gasket or piston possibly defective Repair. 7. Install: spark plug 8. Install: spark plug caps ignition coils 9. Install: heat protector plate battery box bracket battery box Refer to “BATTERY BOX AND BATTERY BOX BRACKET”. battery Refer to “CHECKING AND CHARGING THE BATTERY” in chapter 3. air filter case Refer to “AIR FILTER CASE”. fuel tank Refer to “FUEL TANK”. front cowling inner panel (letf and right) Refer to “COWLINGS”. rider seat Refer to “SEAT”.
3-27 CHECKING THE ENGINE OIL LEVEL CHK ADJ NOTE: EAS00069 CHECKING THE ENGINE OIL LEVEL 1. Stand the motorcycle on a level surface. Place the motorcycle on a suitable stand. Make sure the motorcycle is upright. 2. Start the engine, warm it up for several min- utes, and then turn it off. 3. Check: engine oil level The engine oil level should be between the minimum level mark a and maximum level mark b. Below the minimum level mark Add the recommended engine oil to the proper level. Recommended oil AT 5C (40F) or higher A Yamalube 4 (20W40) or SAE 20W40 type SE motor oil AT 1 5C (60F) or lower B Yamalube 4 (10W30) or SAE 10W30 type SE motor oil
3-28 CHECKING THE ENGINE OIL LEVEL / CHANGING THE ENGINE OILCHK ADJ NOTE: NOTE: Before checking the engine oil level, wait a few minutes until the oil has settled. 4. Start the engine, warm it up for several min- utes, and then turn it off. 5. Check the engine oil level again. Before checking the engine oil level, wait a few minutes until the oil has settled. EAS00074 CHANGING THE ENGINE OIL 1. Start the engine, warm it up for several min- utes, and then turn it off. 2. Place a container under the engine oil drain bolt. 3. Remove: engine oil filler cap 1 engine oil drain bolt 2 (along with the gasket) 4. Drain: engine oil (completely from the crankcase)
3-29 CHANGING THE ENGINE OIL CHK ADJ CAUTION: 43 Nm (4.3 mkg, 31 ftlb) 5. If the oil filter cartridge is also to be replaced, perform the following procedure. a. Remove the oil filter cartridge 1 with an oil filter wrench 2. Oil filter wrench 90890-01426, YU-38411 b. Lubricate the O-ring 3 of the new oil filter cartridge with a thin coat of engine oil. Make sure the O-ring 3 is positioned cor- rectly in the groove of the oil filter cartridge. c. Tighten the new oil filter cartridge to specifi- cation with an oil filter wrench. Oil filter cartridge 17 Nm (1.7 mkg, 12 ftlb) 6. Replace: engine oil drain bolt gasket New 7. Install: engine oil drain bolt (along with the new gasket) 8. Fill: crankcase (with the specified amount of the recom- mended engine oil) Quantity Total amount 3.4 L (2.99 Imp qt, 3.59 US qt) Without oil filter cartridge replacement 2.5 L (2.20 Imp qt, 2.64 US qt) With oil filter cartridge replacement 2.8 L (2.47 Imp qt, 2.96 US qt)
3-30 CHANGING THE ENGINE OIL / MEASURING THE ENGINE OIL PRESSURECHK ADJ CAUTION: WARNING 9. Install: engine oil filler cap 10. Start the engine, warm it up for several min- utes, and then turn it off. 11. Check: engine (for engine oil leaks) 12. Check: engine oil level Refer to “CHECKING THE ENGINE OIL LEVEL”. EAS00077 MEASURING THE ENGINE OIL PRESSURE 1. Check: engine oil level Below the minimum level mark Add the recommended engine oil to the proper level. 2. Start the engine, warm it up for several min- utes, and then turn it off. When the engine is cold, the engine oil will have a higher viscosity, causing the engine oil pressure to increase. Therefore, be sure to measure the engine oil pressure after warming up the engine. 3. Remove: oil gallery bolt 1 The engine, muffler and engine oil are ex- tremely hot. 4. Install: oil pressure gauge 1 adapter 2 Pressure gauge 90890-03153, YU-03153 Oil pressure adapter 90890-03139
3-31 MEASURING THE ENGINE OIL PRESSURE CHK ADJ NOTE: 8 Nm (0.8 mkg, 5.8 ftlb) 5. Measure: engine oil pressure (at the following conditions) Engine oil pressure 240 kPa (2.4 kg / cm 2, 2.4 bar, 34.1 psi) Engine speed Approx. 6,600 r / min Engine oil temperature 96C (205F) Regarding the oil pressure as its own data may fluctuate depending on the oil temperature and viscosity, the oil pressure may fluctuate when measuring. The following data should be used only as a reference when measuring the engine oil pressure. Engine oil pressure Possible causes Below ifi i Faulty oil pump specificationClogged oil filter Leaking oil passage Broken or damaged oil seal Above specificationLeaking oil passage Faulty oil filter Oil viscosity too high 6. Install: oil gallery bolt 1
3-32 ADJUSTING THE CLUTCH CABLE FREE PLAY CHK ADJ c b NOTE: a b EAS00078 ADJUSTING THE CLUTCH CABLE FREE PLAY 1. Check: clutch cable free play a Out of specification Adjust. Clutch cable free play (at the end of the clutch lever) 10 15 mm (0.39 0.59 in) 2. Adjust: clutch cable free play Handlebar side a. Turn the adjusting dial 1 in direction b or c until the specified clutch cable free play is ob- tained. Direction Clutch cable free play is increased. DirectionClutch cable free play is decreased. If the specified clutch cable free play cannot be obtained on the handlebar side of the cable, use the adjusting nut on the engine side. Engine side 3. Remove: seat Refer to “SEAT”. front cowling inner panel (left and right) Refer to “COWLINGS”. fuel tank Refer to “FUEL TANK”. air filter case Refer to “AIR FILTER CASE”. a. Loosen the locknuts 1. b. Turn the adjusting nut 2 in direction a or b until the specified clutch cable free play is ob- tained. Direction Clutch cable free play is increased. DirectionClutch cable free play is decreased. d. Tighten the locknuts.
3-33 ADJUSTING THE CLUTCH CABLE FREE PLAY / CLEANING THE AIR FILTER ELEMENTCHK ADJ CAUTION: 4. Install: air filter case Refer to “AIR FILTER CASE”. fuel tank Refer to “FUEL TANK”. front cowling inner panel (left and right) Refer to “COWLINGS”. seat Refer to “SEAT”. EAS00086 CLEANING THE AIR FILTER ELEMENT 1. Remove: rider seat Refer to “SEAT”. front cowling inner panel (left and right) Refer to “COWLINGS”. fuel tank Refer to “FUEL TANK”. 2. Remove: air filter case cover 1 air filter element 2 3. Clean: air filter element 2 4. Check: air filter element Damage Replace. 5. Install: air filter element 2 air filter case cover 1 Never operate the engine without the air fil- ter element installed. Unfiltered air will cause rapid wear of engine parts and may damage the engine. Operating the engine without the air filter element will also affect the throttle bodies tuning, leading to poor engine performance and possible overheat- ing.