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James Cotswold K7C. 200cc. 1954-1958

Homepage 200cc competition Scrambler: Cotswold K7C Specification
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Frame numbering 1954.  Prefix K7C-xxx. 
1955. 55K7C-xxx.   1956.  56K7C-xxx.   1957.  57K7C-xxx
1958.  AK7C-xxx.  
   
Engine Villiers 7E. Capacity 197cc.  59mm x 72mm
Gears Three speed or four speed optional.
Frame Single downtube with swinging arm rear.  Frame tube had liners for extra strength and a bracing tube at the head stock.
Forks Telescopic fork with oil-damped two-rate springs.  The fork "H section was strengthened also (but not much !)
Fork oil capacity 165cc per leg.  SAE 50
Tyres Front: 21" x 2.75"
Rear: 3.50" x 19"
Wheel rims Front: Dunlop WM1 36 hole.
Rear:  Dunlop WM2 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 1954 Villiers S.24.
1955 Villiers S.25.  1⅛" bore.
Main jet No.120 Standard.
Throttle No. 3
Needle No. 3.
Needle setting 1.95" from tip of needle to bottom of slide
Tank capacity 2 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 Not applicable as the primary chain runs within the gearbox.
Chains Primary chain:  66 pitches.  ⅜" x " x 0.225"
Final drive chain: 
1954 / 55:  123 pitches.  " x 0.335" x 0.205" wide.
1956 125 pitches. 
Sprockets Engine: (crankshaft)  ⅜" pitch. 23 teeth.
Gearbox (final drive) 17 teeth " pitch
Rear wheel sprocket:  48 teeth
Brakes 5" front & rear
Bulbs A direct lighting set was available for the Cotswold.
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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