1980 Johnson 2HP Service Manual, Page 9Get this manual
Mode1 NumberJ2RCSM Horsepower (B.I.Acertified) HP (1.4 kW) at 4500 Full throttle operating range 4200 to 4800 rpm Test tank with test wheel 3900 rpm Test wheel Part Number 316021 Idle rpm 650 rpm Engine type Single cylinder, stroke cycle 1-3 8" stroke (39.69 34.93 mm) Bore and stroke 1-916" bore Piston displacement 2.64 cubic inches (43 Piston ring sets (2 per set) Standard Part Number 383920 0.030" (0.76 mm) oversize Part Number 384312 Width of ring 0.06250.0615 in(1.5881.562 mm) Piston assemblystandard Part Number 384651 0.030" (0.76mm) oversize piston less rings Part Number 384666 Crankshaft size journal 0.75020.7497 in(19.05519.042 mm) Bottom journal 0.75020.7497 in(19.05519.042 mm) Connecting rod crank pin 0.67000.6695 in(17.01817.005 mm) Carburetion Single barrel float feed, with high and low speed adjustments F10at 1eve1 setting Between steps gauge No324891 Inlet needle seat 0.050-0.053 (1 .271.35 mm) Use #55 drill as gage Cooling system Centrifugal Propeller gear ratio 12:25 Propeller drive pin Part Number 316558 Propeller 7-114 4-112 Speed control Single lever, synchronized throttle and spark Weight 24 lbs(10.9 kg) Fuel capacity Gravity feed integral tank qt(0.95 litre) Starter Manual self rewinding Ignition Flywheel magneto Spark plug Champion J6J14 mm Spark plug gap 0.030 inch (0.8 mm) Spark plug torque 17-11220-112 foot-pounds (24-27 N'Breaker point gap 0.020 inch (0.5 mm) Condenser Part Number 580321 Capacity 0.18 to 0.22 MfdCoil Part Number 580971