Maintenance Specifications

Engine oil capacity:
Total amount
Oil and filter change
Oil change

Recommended lubricant:
If temperature does not go below  4°C (40°F)
If temperature does not go above 15C (60°F)

2,900 cc (3.1 US. qt)
2,500 cc (2.6 US. qt)
2,200 cc (2.3 US. qt)

SAE 20W/40SE motor oil

SAE 10W/30SE motor oil

Cranking pressure (at sea level):
Maximum difference between cylinders:

8.5 kg/cm² (121 psi)
1 kg/cm² (14 psi)

Dimensions

Standard size

Wear limit

A

34.80 mm (1.370 in)

34.65 mm (1.364 in)

Intake

B

28.0 mm (1.102 in)

27.85 mm (1.096 in)

C

6.80 mm (0 268 in)

-

A

34.80 mm (1.370 in)

34.65 mm (1.364 in)

Exhaust

B

28.0 mm (1.102 in)

27.85 mm (1.096 in)

C

6.80 mm (0.268 in)

-

Inner Intake/Exhaust

Outer Intake/Exhaust

Free length

35.5 mm (1.398 in)

37.2 mm (1.465 in)

Spring rate

2.429 kg/mm (136.0 lb/in)

4.726 kg/mm (264.7 lb/in)

Installed length (valve closed)

30.5 mm (1.201 in)

32.0 mm (1.260 in)

Installed pressure (valve closed)

9.3 kg (20.5 lb)

18.5 kg (40.8 lb)

Compressed length

(valve open)

IN: 24.0 mm (0.945 in)
EX: 25.5 mm (1.004 in)

IN: 24.0 mm (0.945 in)
EX: 25.5 mm (1.004 in)

Wire diameter

2.7 mm (0.106 in)

3.8 mm (0.150 in)

Number of windings

7.6

6.0

Winding O.D.

19.9^+0.3 _-0 mm (0.783^+0.012 _-0 in)

28.3 ⁺⁰ _-0.3 ^mm (1.114 ⁺⁰ _-0.012 in)

Clearance (Cold engine)

0.11~0.15mm

(0.004~0.006 in)

"A" head diameter

30 ± 0.1 mm (1.1811 ±0.0039 in)

"B" face width

2.3 mm (0.0906 in)

"C" seat width

1.0± 0.1 mm (0.0394 ± 0.0039 in)

"D" margin thickness (minimum)

1.2 ±0.2 mm

(0.0472±0.0079 in)

Stem diameter (O.D.)

₆ ^-0.010 _-0.025 ^mm (0.2362 ^-0.0004 _-0.0010 in)

Guide diameter (I.D.)

6 ^+0.012 ₀ mm (0.2362 ^+0.0005 _-0 in)

Stem-to-guide clearance

0.010 —0.037 mm (0.0004-0.0015 in)

Clearance

(cold engine)

0.16-0.20 mm (0.006-0.008 in)

"A" head diameter

26 ±0.1 mm (1.024± 0.0039 in)

"8" face width

2.3 mm (0.0906 in)

"C" seat width

1.0± 0.1 mm (0.0394 ±0.0039 in)

"D" margin thickness (minimum)

1.0 ±0.2 mm

(0.0394 ±0.0079 in)

Stem diameter (O.D.)

₆ ^-0.025 _-0.040 ^mm (0.2362 ^-0.0010 _-0.0016 in)

Guide diameter (I.D.)

6 ^+0.012 ₀ mm (0.2362 ^+0.0005 _-0 in)

Stem-to-guide clearance

0.025—0.052 mm (0.0010-0.0020 in)

Cylinder and piston:

Cylinder material

Aluminum alloy

Cylinder liner

Pressed in; special cast iron

Bore size:
standard
wear limit

57.00 mm (2.2441 in)
57.10 mm (2.2480 in)

Cylinder taper limit

0.05 mm (0.0020 in)

Cylinder out-of-round limit

0.01 mm (0.0004 in)

Piston clearance:
standard
maximum

0.025- 0.045 mm (0.0010- 0.0018 in)
0.1 mm (0.0039 in)

Piston rings:

Top

2nd

Oil

Design

Barrel

Taper

Expander

End gap (installed):

standard

0.15-0.35 mm (0.0059 -0.0138 in)

0.15-0.35 mm (0.0059-0.0138 in)

0.3-0.9 mm (0.0118-0.035 in)

limit

1.0 mm (0.0394 in)

1.0 mm (0.0394 in)

1.5 mm (0.0591 in)

Side clearance:

standard

0.03—0.07 mm (0.0012-0.0028 in)

0.02-0.06 mm (0.008-0.0024 in)

-

limit

0.15 mm (0.0059 in)

0.15 mm (0.0059 in)

-

Crankshaft:

Crank journal/bearing oi! clearance

0.040~ 0.064 mm (0.0016-0.0025 in)

Main journal run out (maximum)

0.03 mm (0.0012 in)

Connecting rods:

Rod bearing oil clearance

0.03 -0.09 mm (G.0012-0.0035 in)

Oil pump:

Housing-to-outer rotor clearance

0.09-0.15 mm (0.0035- 0.0059 in)

Outer rotor-to-inner rotor clearance

0.03-0.09 mm (0.0012- 0.0035 in)

Clutch:

Frictionpplate:

thickness/q'ty
minimum thickness

3.0 mm (0.12in)/8
2.8 mm (0.11 in)

Clutch plate:

thickness
warp limit

1.6 mm (0.063 in)/7
0.05 mm (0.0020 in)

Clutch spring:

length/q'tv
minimum length
spring rate

41.2 mm (1.622 in)/5
40.2 mm (1.583 in)
1.22 kg/mm (68.3 lb/in)

Clutch lever freeplay (at lever pivot point)

2 -3 mm (0.08-0.12 in)