fits model: Sr540, Et340, Ec340, Ec300, Ss440. make: Yamaha. year: 1980–1984.

( Manufacturer Part Number: 8N4-85540-20-00 ), ( Part Type: Unit )
The Yamaha CDI Unit, specifically model 8N4-85540-20-00, is an essential electronic component designed for multiple Yamaha outboard motor models, including SR540, ET340, EC340, EC300, and SS440. This computerized ignition system ensures optimal engine performance by accurately generating and distributing precise spark to the engine's cylinders.
Design and Construction:Crafted by Yamaha, the CDI unit boasts a robust and compact design, engineered to withstand the rigors of marine environments. Its high-quality components provide reliable operation, even in the face of varying weather conditions and heavy use. The unit's high-tech electronic engineering integrates the latest ignition technology for superior engine performance, fuel efficiency, and reduced emissions.
Features:This CDI unit is engineered to be an ideal power management solution for the specified Yamaha outboard motor models, delivering dependable ignition performance. The unit is equipped with advanced Wide Range Dwell Technology, which allows it to adapt to varying engine conditions, ensuring consistent ignition and smooth engine operation. Furthermore, it features e-Transistor ignition, which enables efficient energy transmission for excellent starting performance and consistent idle.
Compatibility:The 8N4-85540-20-00 Yamaha CDI unit is designed to fit seamlessly into SR540, ET340, EC340, EC300, and SS440 models, providing a direct and secure electrical connection for a hassle-free installation. Additionally, it is engineered to optimally work with various fuel types, ensuring compatibility for a wide range of boaters.
Ease of Installation and Maintenance:Installing the Yamaha CDI unit is a manageable task for experienced do-it-yourselfers, as no significant modifications are required to the motor as long as the original unit is in good condition. Consulting the installation instructions provided by Yamaha and checking for compatibility with your specific outboard model is essential to ensure a successful installation. And with minimal maintenance requirements, this electronic component allows for uninterrupted boating enjoyment.
Conclusion:The Yamaha CDI Unit, model 8N4-85540-20-00, is an indispensable electronic component for owners of SR540, ET340, EC340, EC300, and SS440 Yamaha outboard motors. Its cutting-edge technology, durable construction, and compatibility with various fuel types make it a valuable investment for maximizing engine performance, fuel efficiency, and dependable operation.
The Yamaha CDI unit, specifically model number 8N4-85540-20-00, is a widely used component in various Yamaha engines, including SR540, ET340, EC340, EC300, and SS440. While this CDI unit is generally considered a reliable and effective part for these engines, it's essential to consider the pros and cons to make an informed purchasing decision.
Pros:1. Improved Combustion: The CDI unit delivers more precise ignition timing compared to traditional points or capacitor discharge ignitions. This benefits engine performance by enhancing combustion efficiency.
2. Longer Engine Life: By improving combustion efficiency, the CDI unit can potentially contribute to extended engine life due to reduced wear and tear.
3. Faster Engine Response: The CDI unit can provide faster throttle response for smoother engine operation, which is beneficial in recreational and racing applications where quick response is essential.
4. Emission Compliance: CDI units often meet or exceed emission standards, making them a desirable choice for newer models or areas with stringent environmental regulations.
5. Proven Durability: Yamaha's CDI units are known for their durability and long lifespan, which may prevent the need for frequent replacements.
Cons:1. Cost: The Yamaha CDI unit is a premium component with a relatively high price tag compared to other ignition systems. This might be a barrier to entry for those with smaller budgets.
2. Complexity: The CDI unit is more complex than traditional ignition systems, which may necessitate additional expertise to diagnose and install.
3. Sensitivity to Cold Weather: In extremely cold temperatures, CDI units might require heaters or additional precautions to ensure proper ignition.
4. Potential Compatibility Issues: It's crucial to verify that the specific CDI unit purchased is compatible with your engine model and year. Different engine designs might require different CDI units, which can lead to unwanted complications.
5. Potential for Faults: While uncommon, a faulty CDI unit could result in engine misfires or poor performance. Regular maintenance and tests are necessary to prevent such occurrences.
Conclusion and Recommendation:Upon careful consideration of the pros and cons, the Yamaha CDI unit, model number 8N4-85540-20-00, is a premium ignition system choice forSR540, ET340, EC340, EC300, and SS440 engines. It provides several advantages, such as improved combustion, faster response, and potentially extended engine life. However, potential drawbacks, including cost, complexity, cold sensitivity, and compatibility concerns might impact your decision.
The decision to purchase this CDI unit should be based on criteria such as budget, engine application, and expertise. If you prioritize engine performance, quicker response, and long-term benefits, then the investment in a Yamaha CDI unit could be worthwhile. However, if you have a smaller budget, limited technical expertise, or concerns about cold climate operation, it might be prudent to explore alternative ignition options. Always ensure compatibility, purchase from a reliable supplier, and consider factors like cost and installation complexities before making a decision.
These are used parts so that means they will show you're normal wear, not new unless specified otherwise. I do my best to research the part and see what machines it will work on.
This is a cdi that was removed off 1982 Yamaha RSV 540.