1970 Johnson 1.5 HP Outboard Motor Service Manual, Page 9Get this manual
Model Numbe rs lR70 Horsepower (B.I.Acertified) 1-1 hp at 4000 rpm Full throttle operating range 3500 to 4500 rpm Test tank with test wheel 4200 RPM Engine type Singl cylinder, cycle Bore and stroke 1-9 16" bore 1-3 8" stroke Piston displace ent 2.64 cubic inch es Piston ring sets (2 pe set) Standard Part Number 383920 .020" oversize Part Number 383921 Diameter ring 1.563 in(standard) Width of ring .0625.0615 inLbsco mpr ess ion recommend ed when compressed 1.3 to 2.8 lbsPiston ess rings Part Number 383236 Standard Part Number 383240 .020 oversiz Crankshaft size .7502.7497 injournal .75027497 inBottom journal .6690.6685 inConnecting od rank pin Single barr el f10at feed, with high and Carburetion low-speed adjustme nts Flush with casting Float evel setting .050.053 Use #55 drill as gage Inlet needle seat Vari-Volume Cooling system 12:25 Propeller gear ratio Part Number 203230 Propell erdrive pin Propeller 7-14-1Speed control Single leve r, synchronized throttle and spark Weight 201bsFuel capacity Gravity feed integral tank qtStarter Rope starting Ignition Flywheel magneto Spark plug Champion J4J14mm Spark plug gap .030 inch Spark plug torque 17-120-1 foot-pounds Breaker point gap .020 inch Condenser Part Number 580321 Capacity .18 to .42 Mfd Part No580416 Coil Test Specifications Old Stevens este Switch