Ski-Doo Olympic, TNT, Blizzard, Everest, Scorpion, and Elan Snowmobile 1970–1979 Service Manual (P/N 292)

• Covers Ski-Doo models within the 1970-1979 span, including the Elan, Olympique, T'NT, Everest, Blizzard, and Citation families, plus the RN/Cross Country applications identified in the tables. Listed variants include SS, F/A, F/C, R/V, Plus, electric-start, and L/C configurations.
• Details single- and twin-cylinder 2-cycle engines, including piston-port and rotary-valve designs, engine removal, top-end and complete overhaul work, component inspection, rotary-valve timing, cooling-fan service, fan-belt adjustment, and recoil-starter repair.
• Provides Tillotson HR/HD/HRM and Mikuni carburetor removal, disassembly, cleaning, inspection, reassembly, adjustment, air-flow-meter synchronization, main-jet selection, fuel-pump testing, and model-specific carburetor application tables.
• Covers magneto and CDI ignition, lighting and electric-start systems, breaker-point and ignition-timing adjustment, CDI resistance checks, battery and starter testing, rectifier diagnosis, and electrical fault isolation.
• Includes drive and driven pulley service, pulley alignment, chaincase and sprocket work, pivot, drum, mechanical disc, self-adjusting disc, and hydraulic brake procedures, plus bogie-wheel and slide-rail suspension, steering, ski, axle, and track repair.
• Supplied as a 210-page PDF with 10 service chapters, a three-page index, and 46 pages of model-specific wiring diagrams. Quick-reference and chapter tables cover ignition and rotary-valve timing, carburetor setups, track tension, torque data, engine wear limits, pulley alignment, and cooling-system specifications.

This manual is suited to experienced owner-mechanics and shop technicians who are comfortable using SAE and metric hand tools, a timing gauge, compression tester, multimeter, and model-specific setup data. It also identifies work that should go to a dealer or machine shop, including crankshaft alignment and repair, certain pulley operations, CDI component service, and liquid-cooling pressure tests.

Engine Repair and Tune-Up Detail

The engine chapter separates single-cylinder work from mid-engine and front-engine twin-cylinder procedures. Coverage runs from engine removal and external component stripping through cylinder-head, cylinder, piston, ring, crankcase, and crankshaft work. Inspection material includes piston-to-cylinder clearance, cylinder wear, ring end gap and groove clearance, piston-pin condition, crankshaft end play, bearing and seal checks, and engine-specific tightening tables.

Ignition data distinguishes breaker-point and CDI systems, direct and indirect BTDC measurements, and air-gap checks. The timing tables also call out a specific 343-engine serial break, 3,019,645 through 3,020,644, so the correct specification can be selected for that build. Rotary-valve engines receive their own valve-disc removal, shaft-removal limits, degree-timing, and installation coverage. Air-cooled and liquid-cooled top-end drawings, a typical crankshaft assembly, cooling-fan assembly, rotary-valve/water-pump layout, and carburetor exploded views support the repair text.

Fuel, Electrical, and Troubleshooting

The troubleshooting chapter uses symptom-based fault isolation for no-start, hard-start, poor idle, high-speed misfire, overheating, smoke, power loss, and weak acceleration. Separate charts address lighting, battery, starter, brakes, pulley and belt problems, steering, track ratcheting, and recognizable drive-belt and track damage patterns. Compression and spark checks help divide an engine complaint among fuel delivery, sealing, and ignition before parts are removed.

The fuel-system material goes beyond settings: it covers internal service of Tillotson diaphragm carburetors and Mikuni float carburetors, fuel tanks, filters, auxiliary impulse pumps, and intake silencers. The wiring section supplies dedicated schematics for machines including the 1973 T'NT F/A, 1978 Blizzard 6500, 1978-1979 Citation, 1978-1979 Everest 444 L/C, and late Olympique and Everest/T'NT combinations.

Driveline, Chassis, and Cooling Systems

Power-train procedures distinguish pressed-steel and aluminum chaincases, automatic and external chain tensioners, model-specific drive-pulley types, and multiple brake designs. Chassis coverage identifies bogie-wheel suspension and the ground-leveler, high-performance, and torque-reaction slide systems, with suspension removal, ride adjustment, ski alignment, axle service, track alignment, and track-tension charts. The liquid-cooling chapter applies to certain 1978-and-later Blizzard and Everest models and covers draining, filling and air purging, thermostat work, water-pump removal, radiator removal, capacities, and inspection data.

Two repair cautions deserve attention. Twin cylinders must be aligned before the head nuts are tightened; twin-carburetor and exhaust-socket engines may require an alignment tool to prevent serious engine damage. The manual also warns that carburetor adjustment or jet selection with the intake silencer removed can create a lean condition and damage the engine.

Review the manual's safety warnings before repair work involving gasoline, a running engine, spring-loaded pulleys, recoil-starter springs, ski-runner tension, brakes, or hot pressurized coolant.