Yamaha F25 [44/444] Maintenance specifications
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Yamaha F25 [44/444] Maintenance specifications

Yamaha F25 [44/444] Maintenance specifications
2-5
SPEC
E
MAINTENANCE SPECIFICATIONS
Oil ring
Dimensions (B
×
T) mm (in) 2.50
×
2.75 (0.098
×
0.108)
End gap (installed) mm (in) 0.20 ~ 0.70 (0.008 ~ 0.028)
CONNECTING ROD(S)
Small end inside diameter mm (in) 15.985 ~ 15.998 (0.6293 ~ 0.6298)
Big end oil clearance mm (in) 0.020 ~ 0.052 (0.0008 ~ 0.0020)
Connecting rod inside diameter A: Blue B: Black C: Brown
CRANKSHAFT
Crankshaft outside diameter mm (in) 42.984 ~ 43.000 (1.692 ~ 1.693)
Main journal clearance mm (in) 0.012 ~ 0.044 (0.0005 ~ 0.0017)
Crankcase mark - bearing color A: Blue B: Black C: Brown
Crankshaft big end side
clearance
mm (in) 0.05 ~ 0.22 (0.002 ~ 0.009)
Crankshaft journal clearance mm (in) 0.020 ~ 0.052 (0.0008 ~ 0.0020)
Runout limit mm (in) 0.05 (0.002)
BALANCER
Balancer piston diameter mm (in) 94.893 (3.7360)
Crankcase balancer cylinder
inside diameter
mm (in) 95.018 (3.7409)
Connecting rod inside diameter mm (in) 68.049 (2.6791)
THERMOSTAT
Valve opening temperature ˚C (˚F) 60 (140)
Full-open temperature ˚C (˚F) 70 (158)
Valve lift mm (in) 3 (0.12)
FUEL PUMP
Discharge
L (US gal, Imp gal)/
h @6,000 r/min
70 (18.5, 15.4)
Pressure
kPa (kg/cm
2
, psi)
20 ~ 40 (0.2 ~ 0.4, 3 ~ 6)
Diaphragm stroke mm (in) 3.5 ~ 5.1 (0.14 ~ 0.20)
Plunger stroke mm (in) 5.85 ~ 9.05 (0.23 ~ 0.35)
OIL PUMP
Type Trochoid
Outer rotor-to-housing clear-
ance
mm (in) 0.09 ~ 0.15 (0.004 ~ 0.006)
Outer rotor-to-inner rotor
clearance
mm (in) 0.12 max. (0.005 max.)
Rotor-to-cover clearance mm (in) 0.03 ~ 0.08 (0.001 ~ 0.003)
Shaft-to-housing clearance mm (in) 0.006 ~ 0.034 (0.0002 ~ 0.0013)
Relief valve operating pressure
kPa (kg/cm
2
, psi)
4.12
±
0.30 (0.0412
±
0.003, 0.5859
±
0.043)
Item
Unit
Model
Worldwide F20A F25A
USA, CANADA — F25X
B
T

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