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James Commando K7T. 200cc. 1956-1958

Homepage 200cc Competition Trials: Commando K7T Specification
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Frame numbering 1956.  56K7T-xxx.  1957.  57K7T-xxx.  1958.  AK7T-xxx
   
Engine Villiers Mk 7E/4. Capacity 197cc.  59mm x 72mm
Gears Four speed.
Frame Single downtube with swinging-arm rear.
Forks Telescopic.  Two way oil damping.  The lower crown of the fork assembly has triangular bracing pieces.
Fork oil capacity 165cc per leg.  SAE 50
Tyres Dunlop Trials Universal.  21" x 2.75" front.  4.00" x 19" rear.
Wheel rims Front: Dunlop WM1 36 hole.
Rear:  Dunlop WM3 36 hole.
Ignition timing 11/64" before top dead centre.
Points gap 0.012" - 0.015"
Plug gap 0.018" - 0.025"
Plug type Original spec. Lodge HH14.  14mm short reach.
Carburettor 1956 Villiers S.25.  1⅛" bore.
1957 - 58.  AMAL Type 376 / 76.  (Mixing chamber - 15/16" bore)
Jet size 1956:  Villiers No.120 (standard)
1957 - 58: AMAL  180 (standard)
Throttle 1956: Villiers No 3
1957 - 58:  AMAL No 3½ (standard)
Needle 1956: Villiers No. 3½ (standard)
AMAL  ?
Needle setting 1.95" out.
Tank capacity 2¼ gallons approximately.  Use of unleaded fuel will cause no problems
Petroil mixture 20:1 as originally specified. Can be safely reduced to 24:1 with modern oils.
Gearbox capacity Remove oil level screw on side of engine casing and oil filler screw on top of casing.  Fill oil through the filler opening until oil begins to run out through the level plug hole. The correct level of oil is then assured.  Check it regularly.  Castrol "D"  SAE 140
Chaincase capacity Fill to level plug.
Chains Primary chain:  66 pitches.  ⅜" x ¼" x 0.225"
Final drive chain:  126 links.  ½" x 0.335" x 0.205" wide 
Sprockets Engine: (crankshaft) 23 teeth.  ⅜" pitch.
Gearbox (final drive) 17 teeth ½" pitch
Rear wheel sprocket:  50 teeth (standard)
Brakes 5" front & rear
Bulbs A direct lighting set was available for the Commando.
Headlamp: 6v - 30 / 30w B.C.
Tail: 6v - 3w B.C.
Pilot lamp: 3.5v - 0.15amp.  M.E.S.
Speedo: 6v - 0.15amp. M.B.C.
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