1971 skidoo drive cog dimension

Lemon

3 min read

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04-02-2025

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Finding the precise dimensions for a 1971 Ski-Doo drive cog can be tricky. Unfortunately, there isn't a single, readily available source listing all the specifications for every model year and engine type. The dimensions varied slightly depending on the specific Ski-Doo model (e.g., Olympic, TNT, etc.) and the engine size. However, this guide will provide you with the information you need to locate the correct dimensions and understand what to look for.

Understanding the Drive Cog's Importance

The drive cog, also known as the drive clutch or the primary clutch, is a crucial component in your 1971 Ski-Doo's drive system. It's responsible for transferring power from the engine to the track. A worn or damaged drive cog can lead to poor performance, reduced acceleration, and potential drive train failure. Knowing its dimensions is essential for accurate replacement or repair.

Key Dimensions to Consider

When searching for the correct drive cog dimensions for your 1971 Ski-Doo, focus on these key specifications:

• Number of Teeth: This is one of the most critical dimensions. The number of teeth directly impacts the gear ratio and overall performance. A mismatch in the number of teeth will likely render the drive system dysfunctional.
• Pitch Diameter: This refers to the diameter measured across the pitch circle, which is the theoretical circle where the teeth mesh.
• Outside Diameter: The overall diameter of the cog, including the teeth.
• Bore Diameter (or Shaft Diameter): The inside diameter of the cog's central hole, which fits onto the crankshaft. This is crucial for proper fit and secure mounting.
• Thickness: The thickness of the cog.

How to Find the Correct Dimensions

Since there's no single, centralized database, you'll need to employ a multi-pronged approach to find the exact dimensions for your 1971 Ski-Doo drive cog:

1. Your Ski-Doo's Model and Engine: Start by identifying the exact model and engine size of your 1971 Ski-Doo. This information is usually found on a decal or plate on the machine itself. This is crucial because different models used different drive cogs.

2. Ski-Doo Parts Microfiche: Many online vintage snowmobile parts suppliers provide microfiche diagrams. These diagrams are exploded views of your machine, often showing the drive cog and its part number. The part number will be your key to finding the specifications.

3. Online Forums and Communities: Join online forums or communities dedicated to vintage Ski-Doos. Experienced owners and mechanics can often help identify the correct cog based on your model and engine. Post clear photos of your existing cog (if you still have it) for added clarity.

4. Contacting Parts Suppliers: Reach out directly to vintage snowmobile parts suppliers. They often have access to detailed catalogs and can help you find the correct part and its specifications using your machine's information.

5. Measuring Your Existing Cog (If Possible): If you still have the original drive cog, carefully measure its dimensions using a caliper. Be sure to note the number of teeth and the other dimensions mentioned above.

Beyond Dimensions: Condition and Replacement

Even if you find the correct dimensions, consider the condition of your existing drive cog. Wear and tear, especially on the teeth, can severely impact performance and reliability. Assess for:

• Worn Teeth: Check for signs of wear, chipping, or significant damage to the teeth.
• Surface Damage: Look for cracks, pitting, or other damage on the surface of the cog.
• Misalignment: Verify the cog is aligned correctly on the crankshaft.

Replacing a worn or damaged drive cog is crucial for optimal performance and safety. Remember, always use genuine parts or high-quality replacements to ensure proper fit and longevity.

This guide should provide a solid starting point for your search. Remember to be meticulous in your research, and don't hesitate to reach out to the vintage snowmobile community for assistance. Good luck with your restoration or repair!