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Yamaha F6CMH 4-stroke engine specs

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• Yamaha F6CMH Engine Specifications
• Yamaha F6CMH Engine Troubleshooting

Engine Model ................ Yamaha F6CMH
Engine Type ................ 4-stroke single-cylinder OHV gasoline outboard engine
Number of Cylinders ................ 1
Displacement, cu.in (cc) ................ 8.48 (139)
Cylinder Bore, in (mm) ................ 2.44 (62.0)
Piston Stroke, in (mm) ................ 1.81 (46.0)
Maximum Engine Power, hp (kW) ................ 6.0 (4.4)
Maximum Engine Speed, rpm ................ 4500-5500
Idle Speed, rpm ................ 1450-1550
Lubrication System ................ Wet sump
Exhaust System ................ Through hub exhaust
Cooling System ................ Water cooling with thermostat
Ignition System ................ Capacitor discharge ignition (CDI)
Starting System ................ Manual

Overall Length, in (mm) ................ 29.5 (750)
Overall Width, in (mm) ................ 13.2 (335)
Overall Height (Short Shaft), in (mm) ................ 41 (1040)
Overall Height (Long Shaft), in (mm) ................ 46 (1170)
Transom Height (Short Shaft), in (mm) ................ 17 (435)
Transom Height (Long Shaft), in (mm) ................ 22 (565)
Outboard Weight (Short Shaft), lbs (kg) ................ 60 (27.0)
Outboard Weight (Long Shaft), lbs (kg) ................ 62 (28.0)

Fuel System Type ................ Carburetor
Fuel Type ................ Unleaded gasoline (86 octane minimum)
Fuel Consumption, L/hr ................ 2.2
Fuel Tank Capacity, gal (L) ................ 0.3 (1.1)

Gear Shift ................ F-N-R
Gear Type ................ Sriral bevel gear
Gear Ratio ................ 2.08:1
Gear Oil Capacity, qts (L) ................ 0.11 (0.10)

Trim System ................ Manual Trim and Tilt
Transom Height (Short Shaft), in (mm) ................ 17 (435)
Transom Height (Long Shaft), in (mm) ................ 22 (565)
Steering System ................ Tiller handle

Diameter, in (mm) ................ 8.5 (216)
Pitch, in (mm) ................ 7.5 (190), 8.5 (215)
Number Of Blade ................ 3
Material ................ Aluminum

Engine Fuel Type ................ Unleaded gasoline (86 octane minimum)
Engine Oil Type ................ SAE 10W-30, 10W-40, 15W-40
API Service Classifications ................ SH, SJ, or SL
Engine Oil Capacity, qts (L) ................ 0.63 (0.60)
Gear Lubricant Type ................ Hypoid Gear Oil or API GL3, SAE 90
Gearcase Capacity, qts (L) ................ 0.11 (0.10)
Spark Plug Type ................ NGK CR6HSB
Spark Plug Gap, in (mm) ................ 0.024-0.028 (0.6-0.7)
Valve Clearance (Intake), in (mm) ................ 0.003-0.005 (0.08-0.12)
Valve Clearance (Exhaust), in (mm) ................ 0.003-0.005 (0.08-0.12)

Check Gear Oil ................ Every 50 hours
Check Fuel Filter ................ Every 50 hours
Check Fuel Lines ................ Every 100 hours
Check Anodes ................ Every 100 hours
Check Propeller ................ Every 100 hours
Check Spark Plug ................ Every 100 hours
Check Cooling System ................ Every 100 hours
Check Water Pump ................ Every 100 hours
Check Carburetor ................ Every 100 hours
Check Timing Belt ................ Every 100 hours
Check Idling Speed ................ Every 100 hours
Change Engine Oil ................ Every 100 hours
Change Gear Oil ................ Every 100 hours
Replace Engine Oil Filter ................ Every 100 hours
Replace Fuel Filter ................ Every 100 hours
Replace Spark Plug ................ Every 200 hours
Clean Fuel Tank ................ Every 200 hours
Check Fuel Pump ................ Every 300 hours
Replace Water Pump Impeller ................ Every 300 hours
Check Valve Clearance ................ Every 500 hours

Cylinder head bolt, Nm (lb-ft) ................ 26 (19.5)
Crankcase bolt, Nm (lb-ft) ................ 26 (19.5)
Propeller nut, Nm (lb-ft) ................ 17 (12.0)
Oil drain bolt, Nm (lb-ft) ................ 18 (13.5)
Oil level plug, Nm (lb-ft) ................ 9 (6.5)
Gear oil drain screw, Nm (lb-ft) ................ 9 (6.5)
Spark plug, Nm (lb-ft) ................ 13 (9.5)

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Gasoline and Diesel Engines Technical Data