1975 johnson evinrude snowmobile service repair manual these are the alternate firing 399 35 HP 426 40HP 646 50HP JX and Skimmer sleds
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Length .................................. 103.2 inches
Width .................................... 35.4 inches
Height ......................... 43.4 inches with windshield
34.9 inches without windshield
Engine. ............. OMC 2 - cycle Alternate Firing - 2 Cylinder
Rating ......................... 399CC 35 HP at 6750 RPM
436CC 40 HP at 6750 RPM
646CC 50 HP at 6750 RPM
Starter ................................. Manual rewind
Variable speed drive ..... Centrifugal operated sheave engages V-belt
Overall ratio ................................. 4.43 to 1 ..........................
'7 Final drive Silent Drive Chain
Sprocket ratio standard ..................... 135 - 17:39
145 - 19:39
165 - 19:39
Muffler .................... Tuned for maximum performance
Brake ....................... Caliper - Flange on secondary
Throttle. ............................... Thumb operated
Track ............... Rubber - Polyester Cords fully adjustable
Width ................................... 15.5 inches
Skis ............... Formed steel equipped with leaf springs and
replaceable wear runners.
Seat ........... Vinyl coated cover, molded urethane foam cushion
Hood ................................ Molded fiberglass
Headlamp ....................S ealed beam Westinghouse 7700
Taillamp/Stoplamp. ............................. GE 11 5 7 Acc. ~peedometer/~achometelarm p ................. GE 1816
Fuel tank ........... Capacity - 5 Imperial gallons, 6 U.S. gallons
Fuel .................. Gasoline - Premium or regular leaded
Lubrication ...................... OMC brand 50:1 lubricant
Carburetor ...... TillotsonHD diaphragm type with accelerator pump
RPM Ratings
Idle .....................................13 00 * 200
Transmission belt engaging
speed .................................. .3300 * 300
Ignition
Breakerless magneto C.D. (Capacitor Discharge) ignition
Spark plug .......................... Champion UL-77V
Advance sensor coil resistance. ............... 17 to 19 ohms
Retard sensor coil resistance ................ 28 to 30 ohms
Charge coil resistance (2 coils) total of .......... 600 & 50 ohms