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Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Manual - part 88

9-5

SPEC

MAINTENANCE SPECIFICATIONS

ENGINE

Model

PZ50/PZ50GT/PZ50FX/PZ50M/PZ50VT/PZ50MP

Cylinder head:

Volume (with spark plug)

13.82 ~ 14.62 cm

(0.84 ~ 0.89 cu.in)

0.10 mm (0.0039 in)

Lines indicate straight edge measurement.

Cylinder:

Material

Aluminum alloy with dispersion coating

Bore size

77.000 ~ 77.010 mm (3.0315 ~ 3.0319 in)

0.050 mm (0.0020 in)

0.050 mm (0.0020 in)

Camshaft:

Drive system

Chain drive (left)

Camshaft cap inside diameter

22.000 ~ 22.021 mm (0.8661 ~ 0.8670 in)

Camshaft journal diameter

21.959 ~ 21.972 mm (0.8645 ~ 0.8650 in)

Camshaft-journal-to-camshaft-cap clear-
ance

0.028 ~ 0.062 mm (0.0011 ~ 0.0024 in)

Camshaft dimensions

Intake

“A”

30.450 ~ 30.550 mm (1.1988 ~ 1.2028 in)

<Limit>

30.350 mm (1.1949 in)

“B”

22.610 ~ 22.710 mm (0.8902 ~ 0.8941 in)

<Limit>

22.510 mm (0.8862 in)

Exhaust “A”

30.700 ~ 30.800 mm (1.2087 ~ 1.2126 in)

<Limit>

30.600 mm (1.2047 in)

“B”

22.593 ~ 22.693 mm (0.8895 ~ 0.8934 in)

<Limit>

22.493 mm (0.8856 in)

Camshaft runout

0.03 mm (0.0012 in)

Timing chain:

Model/Number of links

98XRH2015/118

Tensioning system

Automatic

9-6

SPEC

MAINTENANCE SPECIFICATIONS

Valves, valve seats, valve guides:

Valve clearance (cold)

Intake

0.11 ~ 0.20 mm (0.0043 ~ 0.0079 in)

Exhaust

0.21 ~ 0.25 mm (0.0083 ~ 0.0098 in)

Valve dimensions

Valve head diameter A

Intake

23.4 ~ 23.6 mm (0.9213 ~ 0.9291 in)

Exhaust

24.9 ~ 25.1 mm (0.9803 ~ 0.9882 in)

Valve face width B

Intake

1.76 ~ 2.90 mm (0.0693 ~ 0.1142 in)

Exhaust

1.76 ~ 2.90 mm (0.0693 ~ 0.1142 in)

Valve seat width C

Intake

0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)

Exhaust

1.2 ~ 1.4 mm (0.0472 ~ 0.0551 in)

Valve margin thickness D

Intake

0.5 ~ 0.9 mm (0.0197 ~ 0.0354 in)

Exhaust

0.5 ~ 0.9 mm (0.0197 ~ 0.0354 in)

Valve stem diameter

Intake

3.975 ~ 3.990 mm (0.1565 ~ 0.1571 in)

<Limit>

3.945 mm (0.1553 in)

Exhaust

3.960 ~ 3.975 mm (0.1559 ~ 0.1565 in)

<Limit>

3.930 mm (0.1547 in)

Valve guide inside diameter

Intake

4.000 ~ 4.012 mm (0.1575 ~ 0.1580 in)

<Limit>

4.050 mm (0.1594 in)

Exhaust

4.000 ~ 4.012 mm (0.1575 ~ 0.1580 in)

<Limit>

4.050 mm (0.1594 in)

Valve-stem-to-valve-guide clearance

Intake

0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in)

<Limit>

0.08 mm (0.0031 in)

Exhaust

0.025 ~ 0.052 mm (0.0010 ~ 0.0020 in)

<Limit>

0.10 mm (0.0039 in)

Valve stem runout limit

0.01 mm (0.0004 in)

Valve seat width

Intake

0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)

<Limit>

1.6 mm (0.0630 in)

Exhaust

1.2 ~ 1.4 mm (0.0472 ~ 0.0551 in)

<Limit>

1.9 mm (0.0748 in)

Model

PZ50/PZ50GT/PZ50FX/PZ50M/PZ50VT/PZ50MP

9-7

SPEC

MAINTENANCE SPECIFICATIONS

Valve spring:

Free length

Intake

36.51 mm (1.44 in)

<Limit>

34.68 mm (1.37 in)

Exhaust

37.92 mm (1.49 in)

<Limit>

36.02 mm (1.42 in)

Installed length (valve closed)

Intake

30.13 mm (1.19 in)

Exhaust

30.50 mm (1.20 in)

Compressed spring force (installed)

Intake

120.7 ~ 138.9 N (12.3 ~ 14.2 kg, 27.1 ~ 31.2 lb)

Exhaust

150.6 ~ 173.2 N (15.4 ~ 17.7 kg, 33.9 ~ 38.9 lb)

Spring tilt

Intake

2.5°/1.6 mm (0.06 in)

Exhaust

2.5°/1.7 mm (0.07 in)

Winding direction (top view)

Intake

Clockwise

Exhaust

Clockwise

Valve lifter:

Valve lifter outside diameter

Intake

19.982 ~ 19.988 mm (0.7867 ~ 0.7869 in)

<Limit>

19.957 mm (0.7857 in)

Exhaust

22.482 ~ 22.488 mm (0.8851 ~ 0.8854 in)

<Limit>

22.457 mm (0.8841 in)

Valve lifter hole inside diameter

Intake

20.000 ~ 20.018 mm (0.7874 ~ 0.7881 in)

<Limit>

20.048 mm (0.7893 in)

Exhaust

22.500 ~ 22.518 mm (0.8858 ~ 0.8865 in)

<Limit>

22.548 mm (0.8877 in)

Piston:

Piston size (D)

76.955 ~ 76.970 mm (3.0297 ~ 3.0303 in)

Measuring point (H)

11.0 mm (0.43 in)

Piston to-cylinder clearance

0.030 ~ 0.055 mm (0.0012 ~ 0.0022 in)

<Limit>

0.120 mm (0.0047 in)

Piston pin bore off set

0.5 mm (0.0197 in)

Off-set direction

Intake side

Piston pin bore inside diameter

17.002 ~ 17.013 mm (0.6694 ~ 0.6698 in)

<Limit>

17.043 mm (0.6710 in)

Piston pin:

Piston pin outside diameter

16.991 ~ 17.000 mm (0.6689 ~ 0.6693 in)

<Limit>

16.971 mm (0.6681 in)

Piston pin length

42.7 ~ 43.0 mm (1.6811 ~ 1.6929 in)

Piston pin to piston pin bore clearance

0.002 ~ 0.022 mm (0.0001 ~ 0.0009 in)

<Limit>

0.072 mm (0.0028 in)

Model

PZ50/PZ50GT/PZ50FX/PZ50M/PZ50VT/PZ50MP

9-8

SPEC

MAINTENANCE SPECIFICATIONS

Piston ring:

Sectional sketch

Top ring

Ring type

Barrel

Dimensions (B

× T)

0.90

× 2.75 mm (0.035 × 0.108 in)

2nd ring

Top ring (same or no)

Ring type

Taper

Dimensions (B

× T)

0.80

× 2.75 mm (0.031 × 0.108 in)

Oil ring

Dimensions (B

× T)

1.50

× 2.25 mm (0.059 × 0.089 in)

End gap (installed)

Top ring

0.15 ~ 0.25 mm (0.006 ~ 0.010 in)

2nd ring

0.30 ~ 0.45 mm (0.012 ~ 0.018 in)

Oil ring

0.10 ~ 0.40 mm (0.004 ~ 0.016 in)

Side clearance (installed)

Top ring

0.030 ~ 0.065 mm (0.0012 ~ 0.0026 in)

2nd ring

0.020 ~ 0.055 mm (0.0008 ~ 0.0022 in)

Oil ring

0.040 ~ 0.160 mm (0.0016 ~ 0.0063 in)

Plating/coating

Top ring

Chrome plated/parkerizing

2nd ring

Ferox coating

Connecting rod:

Small end diameter

17.005 ~ 17.018 mm (0.6695 ~ 0.6700 in)

Big end diameter

37.000 ~ 37.016 mm (1.4567 ~ 1.4573 in)

Crankshaft-pin-to-big-end-bearing clearance 0.034 ~ 0.058 mm (0.0013 ~ 0.0023 in)
Bearing color code

0 = White 1 = Blue 2 = Black 3 = Brown

Crank pin:

Crank pin outside diameter

33.976 ~ 34.000 (1.3376 ~ 1.3386 in)

Crankshaft:

Measuring point 1

57.5 mm (2.26 in)

Measuring point 2

88.0 mm (3.46 in)

Width A

61.0 ~ 61.6 mm (2.402 ~ 2.425 in)

Width B

144.0 ~ 145.2 mm (5.67 ~ 5.72 in)

Crankshaft runout C

0.03 mm (0.0012 in)

Big end side clearance D

0.160 ~ 0.262 mm (0.0063 ~ 0.0103 in)

Crankshaft-journal-to-crankshaft-journal-
bearing clearance

0.020 ~ 0.044 mm (0.0008 ~ 0.0017 in)

Bearing color code

0 = White 1 = Blue 2 = Black 3 = Brown 4 = Green

Model

PZ50/PZ50GT/PZ50FX/PZ50M/PZ50VT/PZ50MP

Content .. 86 87 88 89 ..