To make it easier for you to choose the right manual, we have compiled various information for you below, such as model designations, types, and production years.
The following models are encompassed by this manual: Ski-Doo Formula / Bombardier
1985 Bombardier Ski-Doo Formula Mach I
1985 Bombardier Ski-Doo Formula MX
1985 Bombardier Ski-Doo Formula Plus LT
1986 Bombardier Ski-Doo Formula Mach I
1986 Bombardier Ski-Doo Formula MX
1986 Bombardier Ski-Doo Formula Plus LT
1987 Bombardier Ski-Doo Formula Mach I
1987 Bombardier Ski-Doo Formula MX
1987 Bombardier Ski-Doo Formula Plus LT
1988 Bombardier Ski-Doo Formula Mach I
1988 Bombardier Ski-Doo Formula MX
1988 Bombardier Ski-Doo Formula Plus LT
1989 Bombardier Ski-Doo Formula Mach I
1989 Bombardier Ski-Doo Formula MX
1989 Bombardier Ski-Doo Formula Plus LT
Model or production year(s): 1985, 1986, 1987, 1988, 1989
Language: English
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"Download the Comprehensive Repair Manual to Solve Your Ski-Doo Issues!"
Struggling with maintenance or repair issues with your 1985-1989 Bombardier Ski-Doo Formula Mach I, MX, Plus LT? Our downloadable manual is here to guide you through every problem. This manual is a comprehensive resource, filled with detailed explanations and step-by-step instructions, that will help you maintain and troubleshoot your Ski-Doo, keeping it in pristine condition.
Engine Specifications/Technical Data:
• The Ski-Doo Formula Mach I features a reliable Rotax 521cc engine.
• The Rotax 521 engine is a two-stroke, twin-cylinder unit.
• It delivers a power output of approximately 73 horsepower.
• The Mach I is equipped with a VM34SS Mikuni carburetor.
• The MX model is powered by a two-stroke, twin-cylinder Rotax 463cc engine.
• The MX's Rotax 463cc engine churns out roughly 68 horsepower.
• Both the Mach I and MX models use a CDI ignition system.
• The Ski-Doo Formula Plus LT is powered by a Rotax 537cc engine.
• This engine delivers approximately 81 horsepower.
• The Plus LT model uses a VM36SS Mikuni carburetor for efficient fuel delivery.
• All models feature a chaincase drive system.
• They are equipped with a CVT (Continuously Variable Transmission).
• These models have a fuel capacity of 10.6 gallons.
• The oil capacity for these models is 3.8 liters.
• The dry weight of the Mach I and MX models is 463 lbs and 458 lbs, respectively.
• The Plus LT model weighs slightly more, coming in at 498 lbs.
• The Ski-Doo Formula models have a length of 108 inches.
• Their width measures 38.6 inches.
• They have a ski stance of 34 inches.
• These models are equipped with hydraulic disc brakes.
• The Mach I and MX models feature a twin-track design.
• The Plus LT model, on the other hand, sports a long-track design for better flotation in deep snow.
• These snowmobiles feature an independent front suspension.
• The rear suspension employs a slide rail design for a comfortable ride.
• They come with a backlit speedometer and tachometer.
• The Ski-Doo Formula models are fitted with a 60/55-watt halogen headlight.
• They are equipped with a 156-link silent chain for quiet operation.
• The cooling system on these models is fan-assisted.
• These models feature an electric start as a standard feature.
• They also come with a hand and thumb warmer for those extra cold days on the trails.
Facts and Details:
- The Ski-Doo Formula Mach I, MX, Plus LT were some of the fastest snowmobiles in their era.
- These models were well-received for their durability and reliability.
- The Plus LT model, with its longer track, was particularly adept at deep snow traversal.
- The Rotax engines used in these models are renowned for their longevity and performance.
- The independent front suspension offered excellent handling and maneuverability.
- The Mach I, MX, and Plus LT models were pioneers of the twin-track design.
- The hydraulic disc brakes provided effective stopping power in all conditions.
- These models were praised for their comfortable seating and ergonomic design.
- The electric start and hand and thumb warmer were considered luxurious features at the time.
- These snowmobiles came with a tool kit for quick on-the-trail repairs.
Maintenance Intervals & Tips:
► Check and replace spark plugs every season or every 1,000 miles, whichever comes first.
► Clean the carburetor at least once per season to prevent buildup and ensure optimal performance.
► Inspect the brake pads and rotors regularly for wear and replace if necessary.
► Check the engine oil and coolant levels before each ride.
► Keep the chaincase oil level checked and replace it every 1,500 miles.
Most Frequent Repairs & Common Broken Parts:
→ Carburetor cleaning and adjustment.
→ Spark plug replacement.
→ Brake pad replacement.
→ Chaincase oil change.
→ Track alignment and tensioning.
→ Suspension bushing replacement.
→ Recoil starter repair.
→ Drive belt replacement.
→ Clutch cleaning and inspection.
→ Cooling system inspection and radiator cleaning.
→ Headlight and taillight bulb replacement.
→ Fuel filter replacement.
→ Exhaust system inspection and gasket replacement.
→ Battery replacement (if equipped with electric start).
→ Ski alignment and wear bar replacement.
Popular Tuning Tips/Modifications:
■ Upgrading the carburetor jets for better fuel delivery and performance.
■ Adding aftermarket exhaust for improved power and sound.
■ Installing a clutch kit for improved acceleration and response.
■ Replacing the stock suspension with high-performance shocks for better handling.
■ Adding a performance air filter for improved engine breathing.
Accessories and Attachments:
+ Saddlebags for storage.
+ Front bumper for protection.
+ Heated grip kit for comfort.
+ Towing hitch for versatility.
+ Snow dust deflectors for improved visibility.
+ Windshield for wind protection.
+ Extra-wide skis for better floatation.
+ Handlebar riser for personalized ergonomics.
+ LED light kit for improved visibility.
+ Cover for protection when not in use.
Owner Reviews:
Most owners praise the 1985-1989 Bombardier Ski-Doo Formula Mach I, MX, Plus LT for their reliable performance and durability. The powerful Rotax engines are particularly lauded for their power output and longevity. These models are also highly appreciated for their exceptional handling, thanks to the independent front suspension.
The Plus LT, with its longer track, earns special mention for its capabilities in deep snow. The twin-track design is another feature that many owners like for the increased stability it provides. The hydraulic disc brakes are appreciated for their excellent stopping power.
However, some owners express dissatisfaction with the fuel consumption of these models. The weight of these snowmobiles is also a point of contention for some, with a few finding them too heavy for their liking.
The 1985-1989 Bombardier Ski-Doo Formula Mach I, MX, Plus LT snowmobiles are remarkable machines that blend power, performance, and reliability. Equipped with robust Rotax engines and packed with features like an independent front suspension and hydraulic disc brakes, these models offer excellent value for snowmobile enthusiasts. They shine in durability, ride comfort, and deep snow performance. Despite a few shortcomings like weight and fuel efficiency, these models remain a solid choice for anyone looking to enjoy the thrill of snowmobiling.
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