Sierra Ignition Switch 3-Position Magneto, White — Push-to-Choke, Corrosion-Resistant OEM Fit

The Sierra MP41000 is a durable three-position magneto ignition switch with push-to-choke functionality, built to resist corrosion and match OEM fit for marine engines.

Sierra designed the MP41000 to meet the tough demands of high-horsepower outboards and the corrosive marine environment. This white, three-position magneto switch replaces factory units with robust construction—non-conductive housing, an inner cylinder seal, and materials that reduce oxidation—so your vessel's starting and ignition systems stay reliable season after season.

How does the MP41000 improve corrosion resistance?

The MP41000 uses materials and seals intended to limit contact oxidation and electrical issues caused by saltwater exposure. These protective measures help maintain electrical continuity and extend the switch's usable life in a marine setting.

• Non-conductive housing reduces risk of shorts from moisture.
• Inner seal between cylinder lock and contact plate prevents water intrusion.
• Component finishes chosen to minimize oxidation over time.

What features make this ignition switch match OEM replacements?

This Sierra unit is produced to correspond with original equipment specifications so it fits and functions like the part it replaces. Fitment and operation are engineered to be compatible with many boat builders and engine manufacturers who use Sierra components.

• Three-position magneto operation for standard on/off/run control.
• Push-to-choke capability integrated into the switch action.
• 7/8" hole size intended for direct replacement in many dashboards.

How easy is installation and everyday use?

Installation is straightforward when replacing like-for-like ignition switches thanks to the standard hole size and connector layout. In daily operation, the push-to-choke and clear three-position detents give simple, reliable control during starting and shutoff.

• Standard 7/8" mounting hole for compatibility with common dash cutouts.
• Push-to-choke action simplifies cold starts without extra controls.
• Non-conductive casing reduces the need for frequent electrical troubleshooting.

Will this switch withstand heavy-duty marine use?

While no component is immune to extreme abuse, the MP41000 is built for demanding engine environments with materials that resist corrosion and electrical failure. It’s designed to hold up under regular exposure to marine conditions and high-power engine operation.

• Engineered for high-horsepower applications and frequent use.
• Sealed interfaces slow degradation from moisture and salt.
• Durability aimed at matching or exceeding the life of original parts.

Who is this for: The Sierra MP41000 suits boat owners, marine mechanics, and fleet operators who need a reliable, OEM-style ignition switch with push-to-choke for outboards and other marine engines. It’s appropriate for anyone replacing a worn or corroded three-position magneto switch or for builders specifying durable, corrosion-resistant electrical components on new or refitted craft.