Yamaha F50 Service Manual

							62Y3A111-36
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Break-in
In the test run, the break-in operation is per-
formed in the following three stages. 
1. One hour a
 at 2,000 r/min or at approxi-
mately half throttle.
2. One hour b
 at 3,000 r/min or 3/4 throttle
and one minute out of every ten at full
throttle.
3. Eight hours c
 at any speed, however,
avoid running at full speed for more than
five minutes.
È
Hour
After test run
1. Check for water in the gear oil.
2. Check for fuel leakage in the cowling.
3. After a test run and while the engine is at
idle, flush the cooling water passage with
fresh water using the flushing kit.
S62Y1580
0
1210
Predelivery checks 
						

							GEN 
INFO
General information
1-3762Y3A11
— MEMO — 
						

							62Y3A11
SPEC
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Specifications
General specifications ................................................................................... 2-1
Maintenance specifications .......................................................................... 2-5
Power unit.................................................................................................. 2-5
Lower unit .................................................................................................. 2-9
Electrical .................................................................................................... 2-9
Power unit................................................................................................ 2-12
Lower unit ................................................................................................ 2-16
Electrical .................................................................................................. 2-16
Dimensions .............................................................................................. 2-19
Tightening torques....................................................................................... 2-29
Specified torques ..................................................................................... 2-29
General torques ....................................................................................... 2-31 
						

							SPECSpecifications
2-162Y3A11
General specifications2
Item UnitModel
USA———F50TR
Canada—F50TH—F50TR
Worldwide F50AEHD F50AEHT F50AED F50AET
Dimension
Overall length mm (in) 1,329 (52.3) 718 (28.3)
Overall width mm (in) 361 (14.2)
Overall height
(L) mm (in) 1,397 (55.0)
(X) mm (in)—1,511 
(59.5)—1,511 
(59.5)
Boat transom height
(L) mm (in) 508 (20.0)
(X) mm (in)—635 (25.0)—635 (25.0)
Weight
(with aluminum propeller)
(L) kg (lb) 108 (238) 112 (247) 104 (229) 108 (238)
(X) kg (lb)—115.5 
(255)—111.5 
(246)
Performance
Maximum output kW (hp) 
@ 5,500 r/min36.8 (50)
Full throttle operating range r/min 5,000–6,000
Maximum fuel consumption L (US gal, 
lmp gal)/hr 
@ 6,000 r/min17.3 (4.57, 3.81)
Power unit
Type In-line, 4-stroke, OHC, 8 valves
Cylinder quantity 4
Displacement cm
3 (cu. in) 935 (57.1)
Bore ×
 stroke mm (in) 63.0 ×
 75.0 (2.48 ×
 2.95)
Compression ratio 9.3
Carburetor quantity 4
Control system Tiller handle Remote control
Starting system Electric
Ignition control system Microcomputer (CDI)
Ignition timing Degree BTDC 5 ±
 3–BTDC 35 ±
 3
Alternator output V, A 12, 10
Enrichment system Prime Start
Choke valve control—
Spark plugs DPR6EA-9 (NGK)
Cooling system Water
Exhaust system Through propeller boss
Lubrication system Wet sump 
						

							62Y3A112-2
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* PON: Pump Octane Number (Research Octane Number + Motor Octane Number)/2
RON: Research Octane Number Fuel and oil
Fuel type Regular unleaded gasoline
Fuel rating *PON
RON86
91
Engine oil type 4-stroke motor oil
Engine oil grade API
SAESE, SF, SG, SH
10W-30, 10W-40, or 20W-40
Engine oil quantity
(with oil filter replacement)
L 
(US qt, lmp qt)2.2 (2.3, 1.9)
(without oil filter replacement)
L 
(US qt, lmp qt)2.0 (2.1, 1.8)
Gear oil type Hypoid gear oil
Gear oil grade API
SAEGL-4
90
Gear oil quantity
L 
(US qt, lmp qt)0.43 (0.45, 0.38)
Bracket
Trim angle 
(at 12 degree boat transom)Degree–4–20
Tilt-up angle  Degree 69
Steering angle Degree 40 + 40
Drive unit
Gear shift positions F-N-R
Gear ratio 1.85 (24/13)
Reduction gear type Spiral bevel gear
Clutch type Dog clutch
Propeller shaft type Spline
Propeller direction
(rear view)Clockwise
Propeller identification mark G
Electrical
Battery capacity Ah (kC) 70–100 (252–360)
Minimum cold cranking 
performanceA 380 Item UnitModel
USA———F50TR
Canada—F50TH—F50TR
Worldwide F50AEHD F50AEHT F50AED F50AET
General specifications 
						

							SPECSpecifications
2-362Y3A11
Item UnitModel
USA T50TR———
Canada T50TR———
Worldwide FT50BET FT50CEHD FT50CED FT50CET
Dimension
Overall length mm (in) 718 
(28.3)1,384 
(54.5)718 (28.3)
Overall width mm (in) 361 (14.2)
Overall height
(L) mm (in) 1,436 (56.5)
Boat transom height
(L) mm (in) 508 (20.0)
Weight
(with aluminum propeller)
(L) kg (lb) 112 (247) 111.5 (246) 108 (238) 112 (247)
Performance
Maximum output kW (hp) 
@ 5,500 r/min36.8 (50)
Full throttle operating range r/min 5,000–6,000
Maximum fuel consumption L (US gal, 
lmp gal)/hr 
@ 6,000 r/min17.3 (4.57, 3.81)
Power unit
Type In-line, 4-stroke, OHC, 8 valves
Cylinder quantity 4
Displacement cm
3 (cu. in) 935 (57.1)
Bore ×
 stroke mm (in) 63.0 ×
 75.0 (2.48 ×
 2.95)
Compression ratio 9.3
Carburetor quantity 4
Control system Remote 
controlTiller 
handleRemote control
Starting system Electric
Ignition control system Microcomputer (CDI)
Ignition timing Degree BTDC 5 ±
 
3–BTDC 
35 ±
 3BTDC 5 ±
 3–BTDC 25 ±
 3
BTDC 5 ±
 3–BTDC 35 ±
 3 
(Depending on market)
Alternator output V, A 12, 10
Enrichment system Prime Start
Choke valve control—
Spark plugs DPR6EA-9 (NGK)
Cooling system Water
Exhaust system Through propeller boss
Lubrication system Wet sump 
						

							62Y3A112-4
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* PON: Pump Octane Number (Research Octane Number + Motor Octane Number)/2
RON: Research Octane Number Fuel and oil
Fuel type Regular unleaded gasoline
Fuel rating *PON
RON86
91
Engine oil type 4-stroke motor oil
Engine oil grade API
SAESE, SF, SG, SH
10W-30, 10W-40, or 20W-40
Engine oil quantity
(with oil filter replacement)
L 
(US qt, lmp qt)2.2 (2.3, 1.9)
(without oil filter replacement)
L 
(US qt, lmp qt)2.0 (2.1, 1.8)
Gear oil type Hypoid gear oil
Gear oil grade API
SAEGL-4
90
Gear oil quantity
L 
(US qt, lmp qt)0.61 (0.64, 0.54)
Bracket
Trim angle 
(at 12 degree boat transom)Degree–4–20
Tilt-up angle  Degree 69
Steering angle Degree 40 + 40
Drive unit
Gear shift positions F-N-R
Gear ratio 2.33 
(28/12)2.31 (30/13)
Reduction gear type Spiral bevel gear
Clutch type Dog clutch
Propeller shaft type Spline
Propeller direction
(rear view)Clockwise
Propeller identification mark K
Electrical
Battery capacity Ah (kC) 70–100 (252–360)
Minimum cold cranking 
performanceA 380 Item UnitModel
USA T50TR———
Canada T50TR———
Worldwide FT50BET FT50CEHD FT50CED FT50CET
General specifications 
						

							SPECSpecifications
2-562Y3A11
Maintenance specifications2
Power unit
Item UnitModel
USA———F50TR
Canada—F50TH—F50TR
Worldwide F50AEHD F50AEHT F50AED F50AET
Power unit
Minimum compression 
pressure*kPa 
(kgf/cm
2, psi)840 (8.4, 119)
Lubrication oil pressure
at 55 °C (131 °F), with 
10W-30 engine oilkPa 
(kgf/cm
2, psi) 
@ 900 r/min100 (1.0, 14)
Cylinder heads
Warpage limit mm (in) 0.1 (0.004)
(lines indicate straightedge 
position)
Cylinder head journal inside 
diametermm (in) 37.00–37.02 (1.4567–1.4575)
Cylinders
Bore size mm (in) 63.00–63.01 (2.480–2.481)
Taper limit mm (in) 0.08 (0.003)
Out-of-round limit mm (in) 0.05 (0.002)
Pistons
Piston diameter (D) mm (in) 62.95–62.96 (2.478–2.479)
Measuring point (H) mm (in) 5 (0.2)
Piston-to-cylinder clearance  mm (in) 0.04–0.06 (0.0016–0.0024)
Oversize piston diameter
1st mm (in) + 0.25 (0.01)
2nd mm (in) + 0.50 (0.02)
Piston pins
Outside diameter mm (in) 15.965–15.970 (0.6285–0.6287)
Piston rings
Top ring
Dimension B mm (in) 1.17–1.19 (0.046–0.047)
Dimension T mm (in) 2.39–2.41 (0.094–0.095)
End gap mm (in) 0.15–0.30 (0.006–0.012)
Side clearance mm (in) 0.04–0.08 (0.0016–0.003)
* Measuring conditions:
Ambient temperature 20 °C (68 °F), wide open throttle, with plugs disconnected from all cylinders.
The figures are for reference only. 
						

							62Y3A112-6
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2nd ring
Dimension B mm (in) 1.47–1.49 (0.058–0.059)
Dimension T mm (in) 2.49–2.51 (0.098–0.099)
End gap mm (in) 0.30–0.50 (0.012–0.020)
Side clearance mm (in) 0.03–0.07 (0.001–0.003)
Oil ring
Dimension B mm (in) 2.34–2.46 (0.092–0.097)
Dimension T mm (in) 2.75 (0.108)
End gap mm (in) 0.20–0.70 (0.008–0.028)
Side clearance mm (in) 0.05–0.19 (0.002–0.008)
Camshafts
Intake (A) mm (in) 30.89–30.99 (1.2161–1.2200)
Exhaust (A) mm (in) 30.82–30.92 (1.2135–1.2175)
Intake and 
exhaust (B)mm (in) 25.95–26.05 (1.0217–1.0256)
Camshaft journal diameter
#1 mm (in) 36.93–36.94 (1.4539–1.4543)
#2, #3, #4 mm (in) 36.94–36.95 (1.4543–1.4547)
Camshaft journal oil clearance
#1 mm (in) 0.055–0.100 (0.0022–0.0039)
#2, #3, #4 mm (in) 0.045–0.090 (0.0018–0.0035)
Maximum camshaft runout mm (in) 0.04 (0.0016)
Rocker arm shafts
Outside diameter mm (in) 15.98–15.99 (0.6291–0.6295)
Rocker arms
Inside diameter mm (in) 16.00–16.01 (0.6299–0.6303)
Valves
Valve clearance (cold)
Intake mm (in) 0.20 ±
 0.05 (0.008 ±
 0.002)
Exhaust mm (in) 0.30 ±
 0.05 (0.012 ±
 0.002)
Head diameter (A)
Intake mm (in) 29.9–30.1 (1.177–1.185)
Exhaust mm (in) 25.9–26.1 (1.020–1.027)
Face width (B)
Intake mm (in) 1.84–2.97 (0.072–0.117)
Exhaust mm (in) 1.98–3.11 (0.078–0.122)
Seat contact width (C)
Intake mm (in) 0.9–1.1 (0.035–0.043)
Exhaust mm (in) 0.9–1.1 (0.035–0.043) Item UnitModel
USA———F50TR
Canada—F50TH—F50TR
Worldwide F50AEHD F50AEHT F50AED F50AET
Maintenance specifications 
						

							SPECSpecifications
2-762Y3A11
Margin thickness (D)
Intake mm (in) 0.6–1.0 (0.024–0.039)
Exhaust mm (in) 0.7–1.1 (0.028–0.043)
Stem diameter
Intake mm (in) 5.48–5.49 (0.2157–0.2161)
Exhaust mm (in) 5.46–5.47 (0.2150–0.2153)
Guide inside diameter
Intake and exhaust mm (in) 5.50–5.51 (0.2165–0.2169)
Stem-to-guide clearance
Intake mm (in) 0.01–0.03 (0.0004–0.0012)
Exhaust mm (in) 0.03–0.05 (0.0012–0.0020)
Stem runout limit mm (in) 0.03 (0.0012)
Valve springs
Free length mm (in) 39.85 (1.569)
Minimum free length mm (in) 37.85 (1.490)
Tilt limit mm (in) 1.7 (0.07)
Connecting rods
Small-end inside diameter mm (in) 15.985–15.998 (0.6293–0.6298)
Big-end inside diameter mm (in) 36.000–36.024 (1.4173–1.4183)
Crank pin oil clearance mm (in) 0.016–0.040 (0.0006–0.0015)
Big-end bearing thickness
Yellow mm (in) 1.500–1.504 (0.0591–0.0592)
Red mm (in) 1.496–1.500 (0.0589–0.0591)
Pink mm (in) 1.492–1.496 (0.0587–0.0589)
Green mm (in) 1.488–1.492 (0.0586–0.0587)
Crankshaft
Crankshaft journal
Diameter mm (in) 42.984–43.000 (1.6923–1.6929)
Crank pin
Diameter mm (in) 32.984–33.000 (1.2986–1.2992)
Runout limit mm (in) 0.04 (0.0016)
Crankcase
Crankcase main journal inside 
diametermm (in) 46.000–46.024 (1.8110–1.8120)
Crankshaft main journal oil 
clearancemm (in) 0.012–0.036 (0.0005–0.0014)
Crankcase main journal 
bearing thickness
Yellow mm (in) 1.502–1.506 (0.0591–0.0593)
Red mm (in) 1.498–1.502 (0.0590–0.0591)
Pink mm (in) 1.494–1.498 (0.0588–0.0590)
Green mm (in) 1.490–1.494 (0.0587–0.0588) Item UnitModel
USA———F50TR
Canada—F50TH—F50TR
Worldwide F50AEHD F50AEHT F50AED F50AET