First Impressions of Sierra International MP51090 MP51090 3 Position Magneto Off Run Start
The Sierra International MP51090 MP51090 3 Position Magneto Off Run Start is a crucial component for anyone relying on magneto ignition systems, especially in marine or small engine applications. Sierra International promises a reliable and corrosion-resistant switch, offering the standard Off, Run, and Start positions. It’s an exact OEM replacement installation, which is always a plus for ease of swapping out a failing unit.
My old magneto switch on my fishing boat’s outboard finally gave up the ghost after years of saltwater exposure. Finding a durable replacement that wouldn’t break the bank was essential. I needed a switch that could withstand the harsh marine environment and provide dependable starting every time.
Upon unboxing, the Sierra International MP51090 MP51090 3 Position Magneto Off Run Start felt solid. The potted construction and color-coded wires inspire confidence. It definitely seems like a step up from the flimsy universal switches I’ve used in the past.
Compared to a generic aftermarket switch I considered and a more expensive Cole Hersee option, the Sierra International switch seemed to strike a good balance between price and features. The potted construction, promising protection against moisture, was the deciding factor. I was cautiously optimistic; hoping it would deliver on its promises of reliability.
Real-World Testing: Putting Sierra International MP51090 MP51090 3 Position Magneto Off Run Start to the Test
First Use Experience
I installed the Sierra International MP51090 MP51090 3 Position Magneto Off Run Start on my 25HP Yamaha outboard, used primarily for weekend fishing trips in saltwater. The initial installation was straightforward thanks to the color-coded wires matching my existing harness. The engine fired up on the first try, which was a welcome change after struggling with the old, corroded switch.
I tested it over a weekend of fishing, encountering both bright sunshine and a brief, salty rain shower. The switch operated smoothly in both conditions. There were no signs of hesitation or electrical issues.
Extended Use & Reliability
After three months of consistent use, the Sierra International MP51090 MP51090 3 Position Magneto Off Run Start has performed flawlessly. There’s no noticeable wear and tear on the switch itself. The engine continues to start reliably every time.
I’ve made sure to rinse the switch with fresh water after each outing to minimize salt buildup. So far, it seems to be holding up well against the elements. Compared to my previous switch, which started showing signs of corrosion within a month, this one is a clear winner.
Breaking Down the Features of Sierra International MP51090 MP51090 3 Position Magneto Off Run Start
Specifications
Material: Polyester. This provides a good balance of durability and resistance to the marine environment.
Length: Short, 5/8 in. Maximum Panel Thickness. This ensures compatibility with a variety of mounting locations.
Terminal Type: 6 Color Coded Wire Leads/Potted. The color-coded wires make installation easier and reduce the risk of errors. The potted construction protects the connections from moisture and vibration.
Back Up Nut: Not required. This simplifies installation.
Face Nut: Hex Black Plastic Face Nut. Provides a secure and corrosion-resistant mounting point.
These specifications are important because they directly impact the reliability and longevity of the switch, especially in harsh environments. The potted construction and corrosion resistance are crucial for marine applications.
Performance & Functionality
The Sierra International MP51090 MP51090 3 Position Magneto Off Run Start performs its job admirably. It provides a reliable and consistent connection for starting and running the engine. The three positions are clearly defined and easy to operate, even with wet hands.
The main strength is its reliability and consistent performance. I haven’t encountered any issues with starting or running the engine. The only area for potential improvement would be a slightly more tactile feel to the switch positions.
It exceeds expectations in terms of reliability and ease of installation. It addresses the issues I had with my previous corroded and unreliable switch.
Design & Ergonomics
The build quality is solid. The polyester material feels durable, and the potted construction provides extra protection. The switch has a comfortable feel in hand.
It’s user-friendly and intuitive to operate. There’s virtually no learning curve.
Durability & Maintenance
Based on my experience so far, the Sierra International MP51090 MP51090 3 Position Magneto Off Run Start should last for several years. The corrosion-resistant materials and potted construction are key to its longevity.
Maintaining the switch is easy; just rinse it with fresh water after each use to remove any salt or debris. No special tools or maintenance procedures are required.
Accessories and Customization Options
The Sierra International MP51090 MP51090 3 Position Magneto Off Run Start doesn’t come with any specific accessories. Its design is primarily focused on being a direct replacement for existing magneto ignition systems.
Customization options are limited, as it’s designed to be a standard switch. However, it is compatible with most standard wiring harnesses and connectors.
Pros and Cons of Sierra International MP51090 MP51090 3 Position Magneto Off Run Start
Pros
- Reliable Starting. Provides consistent and dependable engine starting.
- Corrosion Resistant. Built with materials designed to withstand harsh environments, especially marine environments.
- Easy Installation. Color-coded wires simplify the installation process.
- Potted Construction. Protects the internal components from moisture and vibration.
- OEM Replacement. Exact fit ensures easy replacement of existing switches.
Cons
- Tactile Feedback: The switch could benefit from a more defined “click” or tactile feel when changing positions.
- Limited Customization: No real options for customization beyond the standard functionality.
Who Should Buy Sierra International MP51090 MP51090 3 Position Magneto Off Run Start?
The Sierra International MP51090 MP51090 3 Position Magneto Off Run Start is perfect for boat owners, small engine mechanics, and anyone needing a reliable replacement magneto ignition switch. It’s particularly well-suited for marine applications due to its corrosion resistance.
Someone working on a vintage tractor with a magneto ignition system would also find this a suitable replacement part.
Anyone looking for advanced features or digital controls should skip this product. It’s a basic, reliable switch designed for simple magneto ignition systems. A higher-end switch with integrated gauges or alarms might be a better option for those seeking enhanced functionality.
A must-have is dielectric grease for the wire connections to prevent corrosion. This small addition will maximize the life of the switch.
Conclusion on Sierra International MP51090 MP51090 3 Position Magneto Off Run Start
The Sierra International MP51090 MP51090 3 Position Magneto Off Run Start is a reliable and durable replacement switch that delivers on its promises. It offers excellent value for the price, providing a corrosion-resistant and easy-to-install solution for magneto ignition systems.
The $65.99 price is justified by its build quality and dependable performance. I’ve seen similar switches fail much sooner, making this a worthwhile investment.
I would definitely recommend the Sierra International MP51090 MP51090 3 Position Magneto Off Run Start to anyone needing a replacement magneto ignition switch, especially for marine or small engine applications. Don’t let a faulty switch ruin your day on the water; upgrade to the Sierra International switch and enjoy reliable starting every time!