Engineered Marine Products 75-00403-BR Brass Thermostat for BRP Johnson Evinrude Outboards

The Engineered Marine Products 75-00403-BR is a precision-engineered brass thermostat designed as a direct replacement for BRP, Johnson, and Evinrude outboard engines. Manufactured by EMP — an OEM and aftermarket supplier with over 40 years of marine engine parts expertise — this thermostat is built to restore proper engine temperature regulation and protect your powerhead from overheating or running too cool.

This thermostat opens at 143°F (62°C), the standard operating threshold for the applicable BRP/OMC engine families. The brass construction offers reliable thermal response and corrosion resistance suited for both freshwater and saltwater marine environments.

Key Features:

• Brass construction for reliable thermal cycling and corrosion resistance
• 143°F (62°C) opening temperature for precise engine temperature control
• Direct OEM-replacement fit — no modifications required
• Manufactured to OEM and military specifications for proven quality and longevity
• Compatible with a wide range of BRP/Johnson/Evinrude outboard engine families including 2-cylinder, V4, and V6 models
• Backed by EMP's quality assurance as both an OEM and aftermarket supplier

Compatible engine families include 40–250 HP E-TEC, 6–55 HP, Cross V4 and V6, 9.9 HP 4-Stroke (1994–2001), and 15 HP 4-Stroke (1994–2001) models. Cross-reference part numbers include EMP 75-00403 (stainless variant) and Sierra 18-3543. Always verify fitment against your engine's model and serial number before installation.