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James Cadet J15. 150cc. 1955

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Frame numbering Prefix J15-
   
Engine Villiers Mk 30C. Capacity 147cc.  55mm x 62mm
Gears Three speed.
Frame Single downtube with plunger rear.
Forks Light weight telescopic fork. Plastic gaiters
Tyres 2.75" x 19"
Tyre pressures Front 15 lbs.psi.  Rear 22lb. psi.
Wheel rims Dunlop WMO 36 hole.  Silver painted (Argenized)
Ignition timing 5/32" before top dead centre.
Points gap 0.015"
Plug gap 0.018" - 0.025"
Plug type Original spec. Lodge H14
Carburettor Villiers Type S.19.  Single lever.
Jet size Main jet No. 180
Needle No. 3½
Needle setting 2.015" out.
Tank capacity 2 approximately.  Use of unleaded fuel will cause no problems
Petroil mixture 16:1 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 to oil level mark on dipstick. The correct level of oil is then assured.  Check it regularly.  Castrol "D"  SAE 140
Chaincase capacity ¼ pint.  Fill to oil level plug.
Chains Primary chain:  66 pitches. ⅜" x ¼" x 0.225".  Renold 110038.
Final drive chain: 116 pitches.  ½" x 0.335" x 0.205" wide (Renold  110044).  Tension movement max.   ⅜" - ½" vertical
Sprockets Engine: (crankshaft) 23 teeth  ⅜" pitch.
Gearbox (final drive) 15 teeth ½" pitch
Brakes 4" front.  5" rear.
Bulbs: Direct Main bulb:  6v - 30 / 30w  S.B.C. Pre-focussed.
Tail lamp:   6v -  3w  M.B.C.
Parking  lamp bulb: 3.5v - 0.15amp M.B.C.
Parking  lamp battery  Ever Ready No. 1289.
Speedo bulb:  6v - 0.17amp M.B.C. 
Bulbs: Rectified Main bulb:  6v - 24 / 30w.
Tail lamp:   6v -  3w  M.B.C.
Tail / Stop-light (if fitted): 6v - 18 / 3w B.C.
Parking  lamp bulb: 6v - 3w  M.B.C.
Parking  lamp battery  Ever Ready No. 1289.
Speedo bulb:  6v - 0.17amp M.B.C. 
Battery Lucas type - PUZ7E-9.  6 volt.  12 amp-hours.
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