specifications for the 1275cc LS / moke engine






engine number prefix






These are all large journal (1.75") conrod journal dia






Engine Type 1275cc no tappet covers
cup type welch plugs x 5 no tappet covers


Bore
2.780"




Stroke
3.204"




capacity of combustion chamber
21.4cc




b.m.e.p.
153 lb/sq" 2 3500-5000 rpm



Bhp





Torque





Fuel System
leaded




Compression Ratio
8.8:1




Firing Order
1 3 4 2




Valve Clearance (Inlet)
.012" thou




Valve Clearance (Exhaust)
.012" thou




Cylinder Head Tension
42 ft/lb




Conrod Bolt Tension
35 ft/lb




Main Bearing Tension
67 ft/lb= bolts 57ft/lb = nuts



Crankshaft Pulley Tension
70 ft/lb




Flywheel Tension
150 ft/lb




Points Gap
.015"




Dwell Angle in degrees
60 + or - 5




Spark Plug Type / Gap
bp6es ngk w7dc bosch .025"



Ignition Timing ( max total mech #30)distributor is mecha
0-10 degrees BTDC (depends on fuel/comp ratio and distributor curve)
CO % (at idle)

3%





Oil Capacity
5 litres incl filter




Oil Filter (Industry Number)
screw on z418




Oil Type / Grade
20w/50 sg




Recommended Service Interval
3000 miles/ 5000 km




Crankshaft main journal dia
2.0005"-2.0010 (50.81-50.82mm)



Main bearings running clearance
.001"-.0027"




Connecting rods little end size
.8110"-.8115"




Gudgeon pin press fit
.008"-.0015" interference




Piston rings
width comps.047" x 3 oil .156" end gaps on comp .008"-.015"

Valves 12g940 casting no.
inlet head dia 1.301" exhaust 1.156



Cam timing using .021" tappet clearance





Valve springs free length





Oil pressure normal running
75 lb/in (5.27 kg/cm2




carburettor needle single hs4 1-1/2" su