Technical Data

A

Valves

Material:

Inlet - EN52- Chrome plated stem
Ex. - KE965 - Chrome plated stem

Inlet -

head dia.: 1.500 in. (38.1 mm)
stem dia. (plated area): 0.3115/0.3105 in. (7.912/7.886)

Exhaust -

head dia.: 1.312 in. (33.325 mm)
stem dia.: 0.3115/0.3105 in. (7.912/7.886 mm)

Valve guides

Inside dia.: 0 3145/0 3135 in. (7 988/7 962 mm)
Outside dia.: 0 5015/0 50 in. (1 2 738/12 725 mm)
Heat resisting washer material: Tuffnol grade ASP
Heat resisting washer thickness: 0 062 m. (1 574 mm)

Valve springs

Std Inlet

Combat Inlet

Exhaust

Inner - free length: 1.482 in. (37.642 mm)

1.197 in.

1.259 in.

1.222 in.

Fitted length

(30.40 mm)

(31.98 mm)

(31.04 mm)

Outer -free length: 1.618 in. (41.097 mm)

1.259 in.

1.32 1in.

1.284 in.

Fitted length

(31.98 mm)

(33.55 mm)

(32.61 mm)

Valve timing (measured at 013 in. (.3302 mm)

cam lift

Standard

Combat

Inlet opens BTDC

50°

59°

Inlet closes ABDC

74°

89°

Exhaust opens BBDC

82°

88°

Exhaust closes ATDC

42°

60°

Intermediate timing gear

Bush material: Phosphor bronze
Bush finished dia.: 0.5627/0.5620 in. (14.292/14.274 mm)

Intermediate gear shaft dia.: 0.5615/0.5610 in. (14.262/14.249 mm)

Camshaft chain

Size: .375 in. x .225. Single row (Endiess)
No. of links: 38
Ideal adjustment: 3/16 in. (4.8 mm) up and down on top run of chain

Ignition timing

Fully advanced position: 28° BTDC

Contact breaker

Points gap: .014/ .016 in. ( .35/.4 mm)
Centre bolt thread size: 1/4 in. x 26 T.P.I.

Spark plug

Type: Champion N7Y (was N6Y)
Gap: .023/.028 in. ( .59-.72 mm)

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