fits model: Screamin, Eagle, Evo, Sportster, Twin. make: Eagle, Harley. year: 1986–1999.

( Brand: Harley-davidson ), ( Manufacturer Part Number: 32321-91 ), ( Part Type: Spark Plug Cam ), ( Country/region Of Manufacture: United States )
The 32321-91 Harley-Davidson Screamin' Eagle Spark Plugs are designed specifically for Evo Sportster XL 86 Big Twin Cam engines, including the EX12P model. These high-performance spark plugs are a must-have upgrade for any Harley-Davidson enthusiast looking to optimize their engine's performance and longevity.
Crafted with precision, these spark plugs feature a unique, iridium-enhanced center electrode that provides superior ignition and reliability. Iridium is a rare and hard metal that allows for a longer lifespan compared to traditional nickel-based spark plugs, reducing the need for frequent replacements. This also ensures a consistent and powerful spark, improving combustion efficiency and reducing harmful emissions.
The 32321-91 Harley-Davidson Screamin' Eagle Spark Plugs also boast a copper-alloy ground electrode and insulator nose, both of which contribute to improved heat transfer and resistance to corrosion. This ensures that the spark plugs can withstand the high temperatures and harsh conditions encountered in a motorcycle engine, contributing to a longer lifespan and improved overall engine performance.
Furthermore, these spark plugs are designed to fit seamlessly into your existing ignition system, with a tapered insulator nose and a precision-machined thread seal. This ensures a secure and reliable fit, minimizing the risk of vibration or misfiring.
In summary, the 32321-91 Harley-Davidson Screamin' Eagle Spark Plugs are a premium upgrade for your Evo Sportster XL 86 Big Twin Cam engine. Their iridium-enhanced center electrode provides superior ignition and reliability, while their copper-alloy ground electrode and insulator nose ensure improved heat transfer and resistance to corrosion. The precise fit and secure thread seal ensure a reliable connection, making these spark plugs an excellent investment for any Harley-Davidson enthusiast.
Pros of buying 32321-91 Harley-Davidson Screamin' Eagle Spark Plugs for Evo Sportster XL 86 Big Twin Cam EX12P:1. Improved engine performance: These spark plugs are designed to provide a stronger spark, which can lead to improved combustion and better engine performance.
2. Longer lifespan: Harley-Davidson Screamin' Eagle spark plugs are known for their durability and longer lifespan compared to standard spark plugs.
3. Easy installation: These spark plugs are designed to be easy to install, making it a simple and straightforward upgrade for your motorcycle.
4. Enhanced fuel efficiency: With a stronger spark, these spark plugs can help improve the efficiency of your motorcycle's fuel system, potentially saving you money on gas.
Cons of buying 32321-91 Harley-Davidson Screamin' Eagle Spark Plugs for Evo Sportster XL 86 Big Twin Cam EX12P:1. Higher cost: These spark plugs are more expensive than standard spark plugs, which may be a deterrent for some riders.
2. Potential for over-sparking: If not installed correctly, these spark plugs could potentially over-spark, which can damage your engine.
3. May not be necessary for all riders: If your motorcycle is running well and you're not experiencing any performance issues, these spark plugs may not provide any noticeable benefits.
Conclusion: If you're looking to improve the performance of your Harley-Davidson Evo Sportster XL 86 Big Twin Cam EX12P and are willing to invest in a higher-quality spark plug, the 32321-91 Harley-Davidson Screamin' Eagle Spark Plugs are a solid choice. However, if you're not experiencing any performance issues and are looking to save some money, standard spark plugs may be sufficient for your needs.
Recommendation: If you decide to purchase these spark plugs, make sure to follow the installation instructions carefully to avoid any potential issues. Additionally, consider having your motorcycle tuned after installation to ensure optimal performance.
See pictures for details and condition. Harley Screamin Eagle spark plugs Evo Sportster xl 86-later big Twin cam 99-later 88 new 2-pk of performance plugs, these have the forked contact tip.
Cooler plug that is ideal for higher compression engines.