Choosing the Right Spark Plug for Your 1971-1974 Ski-Doo Elan 250E
Get the correct spark plug and gap to keep your vintage Elan's single-cylinder engine running strong.
- Use an NGK AB-7 for 1971-72 models and an NGK AB-6 for 1973-74 models.
- Always set the spark plug gap to 0.020 inches before installation.
- Due to the two-stroke engine design, plan to replace the plug at the start of each season and always carry a spare.
- Symptoms of a bad plug include hard starting, misfiring, and power loss.
Symptoms of a Bad or Fouled Spark Plug
The simple two-stroke engine in the Elan 250E is sensitive to spark plug condition. Because oil is mixed with the gasoline for lubrication, plugs can become fouled over time. A fouled or worn-out plug can't produce a strong, consistent spark. Watch for these signs:
- Hard Starting or No Start: This is the most common symptom. A weak or nonexistent spark won't ignite the fuel mixture, especially when the engine is cold.
- Engine Misfires: The engine may sputter or run unevenly, particularly under load. It might feel like it's cutting out and then catching again.
- Loss of Power: A poorly firing plug leads to incomplete combustion, which means less power to turn the track. Your Elan will feel sluggish and won't accelerate as it should.
- Rough Idle: If the engine idles erratically or stalls, a fouled plug is a likely culprit.
- Excessive Smoke: While two-strokes always produce some smoke, an increase in smoke combined with poor running can indicate unburnt fuel from a weak spark.
Always Carry Spares
Experienced Elan riders know to always carry one or two extra, pre-gapped spark plugs and a plug wrench. A plug can foul unexpectedly on the trail, and being able to swap it out can be the difference between riding home and a long walk.
Choosing the Right Aftermarket Spark Plug
For a vintage machine like the 1971-1974 Elan 250E, the line between "OEM" and "aftermarket" spark plugs is blurry. Major brands like NGK and Champion were often the original suppliers and continue to offer high-quality replacements. You don't need expensive precious metal (iridium or platinum) plugs for this engine; a standard copper-core plug is the correct and most effective choice.
Fitment can vary by year:
- 1971-1972 Elan 250E: These models typically use an NGK AB-7 (stock number 3010) or an equivalent Champion plug.
- 1973-1974 Elan 250E: These later models often call for a slightly hotter plug, the NGK AB-6 (stock number 2910).
Pro Tip: Always double-check the part number for your specific year. Using the wrong heat range can affect performance and engine health. The NGK AB-6 is a hotter plug than the AB-7.
Brand Quality: NGK vs. Champion
Both NGK and Champion are excellent choices for the Elan 250E. NGK is widely cited as an original equipment supplier for many powersports vehicles and is known for its quality and reliability. Champion plugs, such as the L82C, are also a common and reliable alternative mentioned by owners. You can confidently choose either brand based on availability and price. The most important factor is getting the correct part number and setting the gap properly.
Aftermarket Spark Plug Cost for 1971-1974 Ski-Doo Elan 250E
| Part Type | Price Range |
|---|---|
| New Aftermarket Spark Plug (NGK, Champion) | $5.12 - $14.32 |
Pricing is for a single spark plug. Labor costs are not included.
Frequently Asked Questions
What is the correct spark plug gap for the Elan 250E?
The correct spark plug gap for all 1971-1974 Elan 250E models is 0.020 inches. Always verify the gap with a feeler gauge before installation, even on a new plug.
How often should I change the spark plug?
Due to the nature of two-stroke engines, it's good practice to install a new spark plug at the beginning of each riding season. Given their low cost, changing them as part of your pre-season tune-up is cheap insurance against being stranded.
Are there any recalls for the Elan 250E spark plug?
No. There are no active recalls or Technical Service Bulletins (TSBs) from Ski-Doo or the NHTSA related to the spark plug or ignition system for the 1971-1974 Elan 250E.
How do I change the spark plug?
Changing the plug is a simple task. First, pull the spark plug wire boot straight off the plug. Use a spark plug socket and ratchet to turn the old plug counter-clockwise to remove it. Thread the new, gapped plug in by hand until it is finger-tight, then use the wrench to tighten it about another 1/2 turn. Re-attach the plug wire boot securely.
Technical Specifications
Spark Plug Gap: 0.020 in (0.5mm) Thread Diameter: 18mm Thread Reach: 1/2" (12.7mm)
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.