1968 J о h п s о п OUTBOARD MOTOR SERVICE MANUAL 1-1/2 и р JOHNSON MOTORS, Waukegan, Illinois, U.S.A. I Т E M Н О JM- 6801 OUTBOARD MARINE CORPORATION 1968 INTRODUCTION GENERAL SERVICE IN F O R М A Т I O Н FUEL SYSTEM I G N I Т l O N SYSTEM POWER HEAD LOWER UNIT L I Т H O U.S. A. Download this Manual 2-2 JOHNSON SPECIFICATIONS Model Numbers .........•...................... SC-10 *Horsepower ( О В С - certified) ........... 1-1/2 Ь р at 4000 rpm Full throttle operating range . . . . . . . . . . . . . . . .. 3500 to 4500 rpm Test tank with test wheel ....................... 4400 RPM Engine type ....................... Single cylinder, 2 cycle Bore and stroke ................. 1-9/16" bore х 1-3/8" stroke Piston displacement ...................... 2.64 с и Ы с inches Piston ring sets (2 per set) Standard ........................... Part Number 378412 .020" oversize . . . . . . . . . . . . . . . . . . . . . . . Part Number 378414 Diameter о ! ring . . . . . . . . . . . . . . . . . . . . . .. 1.563 in. (standard) Width о ! ring ........................... .0935 - .0925 in. Lbs. compression recommended when compressed . . .. 2 to 3-1/2 lbs. Piston less rings Standard • . . . • . . . . . . . . . . . • . . . . . . . . . . Part Number 376991 .020oversize .•..................... Part Number 277283 Crankshaft size Т о р journal ...•...................... .6854 - .6849 in. Bottom journal ........................ .6854 - .6849 in. Connecting rod crank pin ................... .6255 - .6250 in. Carburetion . . . . . . . . . . . . .• Single barrel f10at fe·ed, with high and low-speed adjustments Float level setting . . . . . . . . . . . • . . . . . . . . . .. Flush with casting Inlet needle seat . . . . . . . . . . . .. .065 - .062 Use а #52 drill as gag.e Cooling system ..................••••.• Vari-volume c o o l i ~ Propeller gear ratio .............................. 12:25 Propeller drive pin ..................... Part Number 313692 Propeller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-1/4 х 4-1/2 Speed control . . . . . . .. Single lever, synchronized throttle and spark Weight . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . .. 19 lbs. Fuel с а р а с Н у . . . . . . . . . . . . . . . . . . Gravity feed integral tank 1 qt. Starter .................................. Rope starting Ignition . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . Flywheel т а g n е t o Spark plug ....... А С - М 4 2 К , Champion J4J, Auto-Lite А 2 1 Х - 1 4 п u n Spark plug gap .. ............................. .030 i n с Ь Spark plug torque ..•.............. 17-1/2 - 20-1/2 foot-pounds Breaker point gap . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .020 i n с Ь Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . Part Number 580321 Capacity . . . . . . . . . . . . . . • • . . . . . . . . . . . . .. .18 to .22 М f d Part No. 580416 С о Н Test Specifications Old Stevens Tester Switch Index Reading А 2. to 2.5 New Stevens Tester М o d е l No. М А -75 Switch Index Adjustment А 24 Merc-O-Tronic Primary Secondary Operating Resistance Continuity Amperage Min. I М а х Min. I М а х 1.6 .45 I .55 30 I 45 Graham Tester М o d е l 51 Maximum Maximum С о Н Minimum Gap Secondary Primary Index С о Н Test Index 4000 1.2 75 33 75 * Horsepower established at sea level. Allow 2% reduction per 1000' above sea level. Download this Manual 1.58 Figure 2-2. Gearcase Lubrication 6 8 0 Б Z S Figure 2-3. Steering Handle Lubrication L U B R I C A Т l O N POINTS Figure 2-1. Port Side 2-5 Figure 2-4. Magneto С а m , Car- buretor and Choke Lubrication 68038 9 Figure 2-5. Clamp Screw Lubrication Download this Manual