Bombardier Élan, Citation, Tundra, Nordik, Safari, Formula, Alpine II 1991 Snowmobile Shop Manual (P/N 484 0572 00)

The 1991 Ski-Doo/Bombardier Snowmobiles Shop Manual, P/N 484 0572 00, covers the listed Élan, Alpine II, Citation, Tundra, Nordik, Scout, Safari, Cheyenne, and Formula configurations. Use the individual model codes in the coverage box to select the applicable engine, drivetrain, suspension, and electrical information.

PDF Search, Diagram Detail and Page Count

Search and diagram limitations: OCR text search is available, but recognition errors affect some model numbers, diagrams, and specification tables. There are no embedded PDF bookmarks. Small wiring labels require enlargement; some labels and fine lines in the Formula diagrams remain faint. Several diagrams need rotation for reading.

One printable English PDF contains 590 pages, including three introductory/reference pages: the model-coverage introduction, table of contents, and General Information page.

Rotax Overhaul, Clutch Service and Electrical Diagnosis

The following selected coverage highlights summarize the main workshop areas. Other topics include spark-plug condition assessment and rewind-starter service.

• Engine repair: Step-by-step removal, installation, top-end and bottom-end procedures for Rotax 247, 253, 377, 447, 467, 503, 536, and 643 engines.

• Fuel, lubrication and cooling: Carburetor inspection and synchronization, fuel-pump testing, oil-injection adjustment, fan service, coolant bleeding, and rotary-valve timing.

• Clutches and transmission: Drive-belt diagnosis, roller-shaft and TRA pulley repair, driven-pulley adjustment, alignment, brake service, chaincase repair, and gearbox overhaul.

• Electrical troubleshooting: Model wiring diagrams, ignition-system identification, component output and resistance tests, starter repair, battery checks, and symptom-based fault charts.

• Suspension and track: Suspension removal, spring and bushing replacement, shock inspection, ride adjustment, axle service, track replacement, tensioning, and alignment.

• Workshop references: Application-specific service tools, exploded assemblies, torque tables, dimensional inspection methods, wear limits, capacities, and adjustment specifications.

This manual suits mechanics familiar with two-stroke engine repair and equipped for precision measurement; drive-pulley disassembly and assembly are specifically reserved for qualified personnel.

Engine Construction and Overhaul

Separate Top End and Bottom End exploded views accompany the engine-specific procedures. Crankshaft, bearing, seal, piston, and cylinder inspection is supported by measurement methods and fitting limits.

The 253 engine uses an integral cylinder-head design, and its top-end procedures require engine removal. The 643 chapter covers RAVE — Rotax Adjustable Variable Exhaust, including valve service, adjustment, and a symptom/cause/remedy troubleshooting chart.

The Engine Leak Verification Flow Chart links airtightness checks to possible gasket, crankshaft-seal, rotary-valve-seal, and casting faults. It supports fault isolation before committing to an engine teardown.

Carburetors, Oil Injection and Cooling

Mikuni carburetor coverage distinguishes single- and twin-carburetor arrangements, float settings, throttle-slide adjustment, and synchronization. Fuel-pump material separates single-outlet units from Safari- and Formula-type twin-outlet pumps.

Oil-injection coverage includes pump adjustment, line bleeding, operating checks, and bench testing. Cooling chapters distinguish axial-fan equipment from liquid-cooled layouts, with thermostat checks, coolant-pump and reservoir service, and different rotary-valve timing methods for original and replacement crankcases.

Pulley Types and Gearbox Repair

The clutch chapters distinguish round-shaft, roller square-shaft, square-shaft three-ramp, and TRA designs. They address bushings, rollers, slider shoes, calibration components, assembly indexing, and pulley alignment. The TRA assembly is lubrication-free.

Gearbox procedures cover the Cheyenne/Safari GLX two-speed arrangement and the Alpine II/Nordik 50/60 three-speed arrangement, including internal inspection, bearing work, shimming, and shift adjustment.

High-altitude jetting and clutch-calibration information is referenced to a separate High Altitude Technical Data booklet, which is not included in this PDF.

Wiring, Ignition and Starting Systems

Electrical tests distinguish Bosch breaker-point, Nippondenso CDI, and Ducati CDI systems. Wiring references separate model groups and Formula manual- and electric-start configurations.

Connector-location legends, terminal identification, wire-color codes, and tab-and-receptacle service support harness diagnosis. The electrical chapters also explain AC/DC grounding differences and provide ignition-timing checks, starter overhaul procedures, voltage-regulator tests, and fault charts.

Suspension, Steering and Body Repair

Rear-suspension coverage distinguishes bogie-wheel, Torque Reaction, TRS 6, Safari, monoshock, hinged, and Nordik 50/60 assemblies. Exploded views support spring, bushing, shock, and axle work.

Steering and front-suspension material covers handlebars, tie rods, ski legs, A-arms, toe-out adjustment, and lubrication. Body sections address headlamp aiming, speedometer service, windshield and cab hardware, cable routing, material-specific plastic repair, frame inspection, and welding.

Tool Applications and Repair Cautions

Tool tables identify purpose and application, including leak tester kit P/N 861 7256 00, RAVE movement indicator P/N 861 7258 00, bearing simulator P/N 420 8761 55, and pulley alignment bar P/N 529 0071 00.

Crankcase cleaning cautions explain how sharp tools can score mating surfaces and impair sealing. Pulley procedures distinguish metric and imperial puller threads; a mismatched puller can damage the clutch threads.

Starter-system service requires battery isolation. Live ignition and clutch tests require secure mechanical support and clearance around the rotating track.

Thermostat Test-Temperature Preview

The cooling chapter specifies thermostat opening at 44°C (111°F) for Safari applications with the 467 engine. Formula applications with the 467 engine and the 536 engine use 43°C (109°F).

For the 643 engine, the specified opening temperature is 42°C (108°F). These examples show how the thermostat-test data distinguishes engine applications.