Sierra 118-99257 Mercury Mariner RPM Limiter 5800 RPM Outboard Ignition Module

The Sierra 118-99257 is an aftermarket replacement 5800 RPM limiter designed for Mercury and Mariner 2-stroke outboard engines. This electronic rev limiter module protects your outboard engine from over-revving by electronically limiting maximum engine speed to 5800 RPM, helping prevent costly ignition and powerhead damage under wide-open-throttle conditions.

Key Features:

• 5800 RPM limit — electronically caps engine speed to protect internal components
• Designed as an OEM-equivalent replacement for Mercury and Mariner outboard applications
• Compatible with 2-cylinder, 3-cylinder, and 4-cylinder 2-stroke outboard and SportJet engines
• Direct plug-in replacement — no modifications required for installation
• Built to meet or exceed original Mercury factory specifications
• Part of Sierra's marine ignition and electrical replacement line

Sierra marine parts are engineered as OEM-equivalent replacements designed to meet or exceed factory specifications for fit, form, and function. The 118-99257 RPM limiter is an essential ignition system component for maintaining proper engine protection on Mercury and Mariner outboard motors.