Ski-Doo Snowmobiles 1985-1989
Repair & Service Manual by Clymer
  This service, repair & maintenance manual covers Ski-Doo Formula MX 1985-1989, Formula MX High/Altitude (H/A) 1986, Formula Plus 1985-1989, Formula MX LT 1987-1989, Formula Plus LT 1989, and Formula Mach I 1989.
Table of Contents
QUICK REFERENCE DATA
CHAPTER ONE: GENERAL INFORMATION
Manual organization / Notes, cautions and warnings | Safety first | Service hints | Engine and chassis serial numbers | Engine operation | Torque specifications | Fasteners | Lubricants | RTV gasket sealant | Threadlock | Gasket remover | Basic hand tools | Precision measuring tools | Special tools | Mechanic's tips | Ball bearing replacement | Oil seals | Snowmobile operation | Snowmobile safety | Snowmobile code of ethics
CHAPTER TWO: TROUBLESHOOTING
Operating requirements | Troubleshooting instruments | Testing electrical components | Engine electrical system troubleshooting | Voltage regulator | Fuel system | Engine | Two-stroke pressure testing | Power train | Skis and steering | Track assembly
CHAPTER THREE: LUBRICATION, MAINTENANCE AND TUNE-UP
Pre-ride checks | Fluid checks | Break-in procedure | 10-hour inspection | Lubrication | Weekly or every 150 miles (240 km) maintenance | Monthly or every 500 miles (800 km) | Once a year or every 2,000 miles (3,200 km) | General inspection and maintenance | Engine tune-up
CHAPTER FOUR: HIGH-ALTITUDE AND REAR SUSPENSION ADJUSTMENT
High-altitude carburetor tuning | High-altitude clutch tuning | Gearing | Suspension adjustment
CHAPTER FIVE: ENGINE
Engine number identification | Engine lubrication | Service precautions | Servicing engine in frame | Engine removal | Engine mounts | Engine installation | Engine top end | Cylinder | Rotax Automatic Variable Exhaust (RAVE) (583 engines) | Piston, wrist pin and piston rings | Crankcase, crankshaft and rotary valve | Rotary valve and shaft
CHAPTER SIX: FUEL AND EXHAUST SYSTEMS
Air silencer | Carburetor | Carburetor operation | Fuel pump | Fuel tank | Fuel valve (if so equipped) | Throttle cable replacement | Exhaust system | Exhaust system repair
CHAPTER SEVEN: ELECTRICAL SYSTEM
Capacitor discharge ignition (CDI) | Ignition coil | CDI box | Voltage regulator | Lighting system | Meter assembly | Pilot lamps | Switches | Fuel level sensor | Oil level gauge | Wiring diagrams
CHAPTER EIGHT: OIL INJECTION SYSTEM
System components | Oil pump service | Component replacement | Oil pump
CHAPTER NINE: LIQUID COOLING SYSTEM
Thermostat | Water pump | Heat exchanger | Hoses
CHAPTER TEN: RECOIL STARTER
CHAPTER ELEVEN: DRIVE SYSTEM
Drive unit | Primary sheave assembly | Secondary sheave | Drive belt | Primary sheave service (1985 and 1986 MX) | Primary sheave service (1986 Plus and all 1987 and later models) | Secondary sheave service
CHAPTER TWELVE: BRAKE, CHAINCASE AND DRIVE AXLE
Drive chain and sprockets | Chaincase, brake caliper and jackshaft | Drive axle | Drive axle axial play
CHAPTER THIRTEEN: FRONT SUSPENSION AND STEERING
Skis | Front suspension | Shock absorber | Steering assembly | Steering adjustment
CHAPTER FOURTEEN: TRACK AND GEAR SUSPENSION
Rear suspension | Slide shoes | Runner protector | Rear shock absorbers | Front shackle, front swing arm and front arm | Rear shackle and rear arm | Rear axle | Suspension and guide wheels | Track
CHAPTER FIFTEEN: OFF-SEASON STORAGE
WIRING DIAGRAMS
Our easy-to-use snowmobile shop manuals can save you money in repair and maintenance bills. Step-by-step procedures and detailed illustrations guide you through every job, from routine maintenance and troubleshooting, all the way to complete teardown & rebuild.
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