Spark Plug Guide for the 1971-1980 Ski-Doo Elan 250
Keep your vintage Elan 250 running reliably with the correct spark plug.
- The most common replacement spark plugs are the NGK B7HS and NGK AB-6.
- Always check and set the spark plug gap to approximately 0.020 inches before installation.
- Replacing the spark plug annually is cheap insurance against being stranded.
- Always carry a spare spark plug and a wrench when riding.
Signs of a Failing Spark Plug
The spark plug is a simple part, but it's vital to your Elan's ignition system. Because it's a 2-stroke engine, the plug can wear or get dirty over time, a condition called "fouling." A fouled or worn-out plug can leave you stranded. It's a good practice to always carry a spare plug and the small wrench needed to change it.
Common Failure Symptoms:
- Hard Starting: The engine cranks but won't fire up, or takes many pulls to start.
- Misfiring: The engine may sputter, hesitate, or run unevenly, especially under acceleration.
- No Spark: If you have no spark, the plug is one of the first and easiest things to check.
- Visible Fouling: A plug covered in black, oily, or sooty deposits is fouled and won't spark correctly.
Choosing the Right Aftermarket Spark Plug
For a vintage machine like the Elan 250, you don't need expensive, high-performance spark plugs. Standard, reliable aftermarket plugs from well-known brands are an excellent choice and perform just as well as the original equipment. Both NGK and Champion are trusted brands that have been used in these snowmobiles for decades.
Brand Tiers & Recommendations
Tier 1: NGK, Champion
These brands are essentially OEM-quality for your Elan. They provide consistent performance and are readily available. The most important factor is getting the correct part number for your specific year, as there were slight variations.
- NGK: NGK is a very common and reliable choice for the Elan 250. The B7HS and AB-6 are frequently cited part numbers. The copper core in these standard plugs helps with heat dissipation, which is important for engine health.
- Champion: Champion is another original supplier for many snowmobiles of this era. They offer equivalent performance to NGK.
Pro Tip: The biggest difference between brands for your Elan 250 is often just user preference. Both NGK and Champion will provide reliable spark. The key is to ensure you have the correct plug and that it is gapped properly before installation.
| Brand | Model | Spark Gap | Notes |
|---|---|---|---|
| NGK | B7HS | 0.020" - 0.028" | A very common replacement. |
| NGK | AB-6 / 2910 | 0.020" - 0.028" | Also widely used, check fitment for your specific year. |
| Champion | L82C (or equivalent) | 0.020" | Cross-reference to ensure fitment. |
Note: Always verify the recommended spark plug gap in your service manual or with the plug manufacturer. A common gap setting for the Elan 250 is 0.020 inches.
Replacement Cost
Spark plugs for the Elan 250 are very affordable. Replacing the plug is a simple maintenance task that you can easily do yourself with a basic spark plug socket.
| Part | Cost Range |
|---|---|
| New Aftermarket Spark Plug (Single) | $5.12 - $14.32 |
Frequently Asked Questions (FAQ)
How often should I change the spark plug on my Elan 250?
It's good practice to inspect your spark plug before each season and replace it if it looks fouled or worn. Given their low cost, many owners simply replace them annually as preventative maintenance to ensure reliability.
What is the correct spark plug gap for my Elan 250?
The most commonly recommended spark plug gap is 0.020 inches (0.5mm). However, some plugs may come pre-gapped to 0.028 inches. It is always best to check the gap with a feeler gauge and adjust if necessary before installation.
What does a "fouled" spark plug look like?
A fouled plug will have deposits on the insulator and electrode. A black, sooty deposit usually means the fuel mixture is too rich or you've been idling a lot. A wet, oily deposit can indicate a more serious engine issue. A healthy plug should have a light tan or grayish-brown color.
Is there a recall on the spark plug for my Ski-Doo Elan?
No, there are no specific recalls or Technical Service Bulletins (TSBs) related to the spark plugs on the 1971-1980 Ski-Doo Elan 250. Searches of the NHTSA database and BRP's recall site show no relevant results for this vintage model.
Should I use a hotter or colder spark plug?
For a stock engine, you should stick with the standard heat range plug recommended by the manufacturer (like the NGK B7HS). Using a plug that is too "hot" can lead to engine damage, while a plug that is too "cold" can foul more easily. Unless you have a modified engine, the standard plug is the correct choice.
Technical Specifications
OEM Part Numbers: NGK B7HS NGK AB-6 NGK 2910 Champion L82C
Thread: 18mm, Hex Size: 13/16" (21mm), Spark Gap: 0.020" (0.5mm)
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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.