Norton Commando Workshop Manual

## 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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