Choosing the Right Spark Plugs for Your 1968-1972 NSU Sport Bertone
Keep your rare Bertone-designed coupe running smoothly with the correct set of new spark plugs.
- The NSU Sport Bertone requires two standard copper-core spark plugs; modern platinum or iridium plugs are not necessary.
- Correctly gapping the plugs to 0.6mm-0.7mm is more critical for performance than the specific brand you choose.
- Symptoms of bad plugs include rough idle, power loss, and difficulty starting.
- This is a very simple DIY task that can be completed in under 30 minutes with basic tools.
Signs of Failing Spark Plugs in Your NSU
The simple design of the Sport Bertone's engine means it's sensitive to spark plug condition. Worn or fouled plugs can cause noticeable problems. Look out for symptoms like engine misfires, rough idling, a lack of power when accelerating, or difficulty starting the engine. While other issues like a dirty carburetor can cause similar symptoms, checking the spark plugs is an easy and inexpensive first step in troubleshooting.
Choosing the Right Aftermarket Spark Plug
For a vintage car like the NSU Sport Bertone, using a modern, high-tech iridium or platinum spark plug is generally not necessary and may not provide any benefit. The original ignition system was designed for standard copper-core plugs. Both Autolite and Champion offer compatible copper plugs that work well in this application when properly installed and gapped.
Brand Quality & Reputation
| Brand | General Assessment for Vintage Engines |
|---|---|
| Autolite | Often favored by owners of older vehicles for light use, as they are sometimes perceived to resist fouling better in rich-running conditions. They are a reliable, budget-friendly choice that meets the requirements of the NSU engine. |
| Champion | A long-established brand that was specified as a compatible option for the NSU Prinz and Sport Prinz. Some owners of other vintage machines report that modern Champions can be more prone to fouling with light use, but perform well under heavy load. Quality control can be a concern for some users, but they remain a viable option. |
Pro Tip: For the NSU's air-cooled engine, the specific heat range and spark plug gap are more important than the brand name. Ensure your new plugs are gapped to the correct specification, typically between 0.6mm and 0.7mm (0.024" - 0.028"), before installation.
Cost of New Aftermarket Spark Plugs (1968-1972 NSU Sport Bertone)
Replacing spark plugs is one of the most affordable maintenance jobs you can do. Since the Sport Bertone only has two cylinders, you will only need to purchase two plugs. Labor costs are minimal if you have a mechanic do the work, as the job is very simple on this car.
| Part Type | Price Range (Per Pair) | Notes |
|---|---|---|
| New Aftermarket (Autolite, Champion) | $7.36 - $24.72 | This is the recommended and most common option. Prices reflect standard copper-core plugs. |
| Shop Labor | $40 - $80 | Typically less than an hour of work for a professional. |
Vehicle-Specific Issues & Recalls
No recalls or Technical Service Bulletins (TSBs) related to spark plugs are on file for the 1968-1972 NSU Sport Bertone in the North American market. This is common for low-production vintage vehicles. Any running issues should be diagnosed by checking the full ignition and fuel systems.
Frequently Asked Questions (FAQ)
How often should I change the spark plugs on my NSU Sport Bertone?
For a vintage car with a simple ignition system using standard copper plugs, a good interval is every 10,000 to 15,000 miles or every 2-3 years, whichever comes first. Given that these cars are often driven infrequently, time is as important as mileage.
What is the correct spark plug gap?
The recommended gap for the Sport Bertone is between 0.6mm and 0.7mm (0.024" and 0.028"). Always verify the gap with a feeler gauge and adjust if necessary before installing new plugs.
Can I use iridium or platinum plugs?
While you might find a modern plug that fits, it is not recommended. The ignition system was not designed for these plugs, and you will not see a performance benefit. Standard copper plugs like the Autolite 404 or Champion N7YC equivalents are the correct choice.
Is it difficult to change the spark plugs myself?
No, this is a very easy DIY job. The rear-mounted, air-cooled engine provides excellent access to the two spark plugs. You only need a spark plug socket, a ratchet, and a gapping tool. The entire process should take less than 30 minutes.
Technical Specifications
OEM Part Numbers: Bosch W 225 T2 Bosch W 200 T30
Thread Size: M14x1.25, Reach: 19mm (3/4"), Seat Type: Gasket, Recommended Gap: 0.6mm - 0.7mm (0.024" - 0.028").
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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.