Content .. 88 89 90 91 ..

Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 90

9-5

SPEC

MAINTENANCE SPECIFICATIONS

ENGINE

Model

FX10/FX10RT/FX10RTR/FX10RTRA/FX10MT/FX10MTR/

FX10MTRA

Cylinder head:

Volume (with spark plug)

25.21 ~ 26.01 cm

(1.54 ~ 1.59 cu.in)

0.10 mm (0.0039 in)

Lines indicate straight edge measurement.

Cylinder:

Material

Aluminum alloy with dispersion coating

Bore size

82.000 ~ 82.010 mm (3.2283 ~ 3.2287 in)

0.050 mm (0.0020 in)

0.050 mm (0.0020 in)

Camshaft:

Drive system

Chain drive (right)

Camshaft cap inside diameter

24.500 ~ 24.521 mm (0.9646 ~ 0.9654 in)

Camshaft journal diameter

24.459 ~ 24.472 mm (0.9630 ~ 0.9635 in)

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

0.028 ~ 0.062 mm (0.0011 ~ 0.0024 in)

Camshaft lobe dimensions

Intake

“A”

34.350 ~ 34.450 mm (1.3524 ~ 1.3563 in)

<Limit>

34.250 mm (1.3484 in)

“B”

24.950 ~ 25.050 mm (0.9823 ~ 0.9862 in)

<Limit>

24.850 mm (0.9783 in)

Exhaust “A”

33.950 ~ 34.050 mm (1.3366 ~ 1.3406 in)

<Limit>

33.850 mm (1.3327 in)

“B”

24.950 ~ 25.050 mm (0.9823 ~ 0.9862 in)

<Limit>

24.850 mm (0.9783 in)

Camshaft runout

0.030 mm (0.0012 in)

Timing chain:

Model/Number of links

98XRH2010/140

Tensioning system

Automatic

9-6

SPEC

MAINTENANCE SPECIFICATIONS

Valves, valve seats, valve guides:

Valve clearance (cold)

Intake

0.15 ~ 0.22 mm (0.0059 ~ 0.0087 in)

Exhaust

0.21 ~ 0.25 mm (0.0083 ~ 0.0098 in)

Valve dimensions

Valve head diameter A

Intake

30.90 ~ 31.10 mm (1.2165 ~ 1.2244 in)

Exhaust

25.90 ~ 26.10 mm (1.0197 ~ 1.0276 in)

Valve face width B

Intake

1.90 ~ 2.62 mm (0.0748 ~ 0.1031 in)

Exhaust

1.90 ~ 2.62 mm (0.0748 ~ 0.1031 in)

Valve seat width C

Intake

0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)

Exhaust

0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)

Valve margin thickness D

Intake

0.80 ~ 1.20 mm (0.0315 ~ 0.0472 in)

Exhaust

0.50 ~ 0.90 mm (0.0197 ~ 0.0354 in)

Valve stem diameter

Intake

4.475 ~ 4.490 mm (0.1762 ~ 0.1768 in)

<Limit>

4.445 mm (0.1750 in)

Exhaust

4.460 ~ 4.475 mm (0.1756 ~ 0.1762 in)

<Limit>

4.430 mm (0.1744 in)

Valve guide inside diameter

Intake

4.500 ~ 4.512 mm (0.1772 ~ 0.1776 in)

<Limit>

4.550 mm (0.1791 in)

Exhaust

4.500 ~ 4.512 mm (0.1772 ~ 0.1776 in)

<Limit>

4.550 mm (0.1791 in)

Valve-stem-to-valve-guide clearance

Intake

0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in)

<Limit>

0.080 mm (0.0031 in)

Exhaust

0.025 ~ 0.052 mm (0.0010 ~ 0.0020 in)

<Limit>

0.100 mm (0.0039 in)

Valve stem runout limit

0.010 mm (0.0004 in)

Valve seat width

Intake

0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)

<Limit>

1.6 mm (0.0630 in)

Exhaust

0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)

<Limit>

1.6 mm (0.0630 in)

Model

FX10/FX10RT/FX10RTR/FX10RTRA/FX10MT/FX10MTR/

FX10MTRA

9-7

SPEC

MAINTENANCE SPECIFICATIONS

Valve spring:

Free length

Intake

39.57 mm (1.56 in)

<Limit>

37.59 mm (1.48 in)

Exhaust

39.57 mm (1.56 in)

<Limit>

37.59 mm (1.48 in)

Installed length (valve closed)

Intake

34.60 mm (1.36 in)

Exhaust

34.60 mm (1.36 in)

Compressed spring force (installed)

Intake

112.30 ~ 129.30 N (11.45 ~ 13.18 kg, 25.24 ~ 29.07 lb)

Exhaust

112.30 ~ 129.30 N (11.45 ~ 13.18 kg, 25.24 ~ 29.07 lb)

Spring tilt

Intake

2.5°/1.7 mm (2.5°/0.07 in)

Exhaust

2.5°/1.7 mm (2.5°/0.07 in)

Winding direction (top view)

Intake

Clockwise

Exhaust

Clockwise

Valve lifter:

Valve lifter outside diameter

Intake

26.482 ~ 26.488 mm (1.0426 ~ 1.0428 in)

<Limit>

26.457 mm (1.0416 in)

Exhaust

26.482 ~ 26.488 mm (1.0426 ~ 1.0428 in)

<Limit>

26.457 mm (1.0416 in)

Valve lifter hole inside diameter

Intake

26.500 ~ 26.518 mm (1.0433 ~ 1.0440 in)

<Limit>

26.548 mm (1.0452 in)

Exhaust

26.500 ~ 26.518 mm (1.0433 ~ 1.0440 in)

<Limit>

26.548 mm (1.0452 in)

Piston:

Piston size (D)

81.950 ~ 81.965 mm (3.2264 ~ 3.2270 in)

Measuring point (H)

11.0 mm (0.43 in)

Piston to-cylinder clearance

0.035 ~ 0.060 mm (0.0014 ~ 0.0024 in)

<Limit>

0.120 mm (0.0047 in)

Piston pin bore off set

0.5 mm (0.020 in)

Off-set direction

Exhaust side

Piston pin bore inside diameter

19.004 ~ 19.015 mm (0.7482 ~ 0.7486 in)

<Limit>

19.045 mm (0.7498 in)

Piston pin:

Piston pin outside diameter

18.991 ~ 19.000 mm (0.7477 ~ 0.7480 in)

<Limit>

18.971 mm (0.7469 in)

Piston pin length

52.7 ~ 53.0 mm (2.07 ~ 2.09 in)

Piston pin to piston pin bore clearance

0.004 ~ 0.024 mm (0.0002 ~ 0.0009 in)

<Limit>

0.074 mm (0.0029 in)

Model

FX10/FX10RT/FX10RTR/FX10RTRA/FX10MT/FX10MTR/

FX10MTRA

9-8

SPEC

MAINTENANCE SPECIFICATIONS

Piston ring:

Top ring

Ring type

Barrel

Dimensions (B

× T)

1.00

× 2.80 mm (0.039 × 0.110 in)

2nd ring

Top ring (same or no)

Ring type

Taper

Dimensions (B

× T)

1.00

× 2.90 mm (0.039 × 0.114 in)

Oil ring

Dimensions (B

× T)

1.50

× 2.50 mm (0.059 × 0.098 in)

End gap (installed)

Top ring

0.33 ~ 0.45 mm (0.013 ~ 0.018 in)

2nd ring

0.70 ~ 0.85 mm (0.028 ~ 0.033 in)

Oil ring

0.20 ~ 0.60 mm (0.008 ~ 0.024 in)

Side clearance (installed)

Top ring

0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in)

2nd ring

0.020 ~ 0.060 mm (0.0008 ~ 0.0024 in)

Oil ring

0.040 ~ 0.110 mm (0.0016 ~ 0.0043 in)

Plating/coating

Top ring

Chrome plated/parkerizing

2nd ring

Parkerizing

Connecting rod:

Small end diameter

19.005 ~ 19.027 mm (0.7482 ~ 0.7491 in)

Big end diameter

41.000 ~ 41.018 mm (1.6142 ~ 1.6149 in)

Crankshaft-pin-to-big-end-bearing clearance 0.033 ~ 0.050 mm (0.0013 ~ 0.0020 in)
Bearing color code

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

Crank pin:

Crank pin outside diameter

37.976 ~ 38.000 mm (1.4951 ~ 1.4961 in)

Crankshaft:

Measuring point 1

62.0 mm (2.44 in)

Measuring point 2

100.0 mm (3.94 in)

Width A

62.25 ~ 62.65 mm (2.45 ~ 2.47 in)

Width B

234.65 ~ 235.65 mm (9.24 ~ 9.28 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

0.027 ~ 0.045 mm (0.0011 ~ 0.0018 in)

Bearing color code

2 = Black 3 = Brown 4 = Green 5 = Yellow 6 = Pink 7 = Red
8 = White

Model

FX10/FX10RT/FX10RTR/FX10RTRA/FX10MT/FX10MTR/

FX10MTRA

Content .. 88 89 90 91 ..