Quicksilver 8M6010305 143°F Outboard Thermostat for OMC Johnson Evinrude 2-Stroke 90-170 HP

The Quicksilver 8M6010305 is a 143°F replacement thermostat engineered for select 90–170 HP Evinrude, Johnson, and OMC V-4 and V-6 2-cycle outboard engines. Built to the same exacting standards as original equipment, this thermostat ensures your engine maintains proper operating temperature for reliable performance on the water.

Key Features:

• 143°F opening temperature engineered to match OEM thermal specifications
• Compatible with select 90–170 HP Evinrude, Johnson, and OMC V-4 and V-6 2-stroke outboards
• Manufactured by Quicksilver, the premier supplier of Mercury Marine OEM replacement parts
• Designed and validated to meet all original equipment manufacturer (OEM) performance specifications
• Direct replacement for Johnson/Evinrude OEM part numbers: 435491 and 437090
• Cross-references Sierra aftermarket part number: 18-3544

Important Notes:

• Hardware, gaskets, and seals required for installation are sold separately
• Consult your engine's owner's manual or service manual to confirm fitment for your specific model and serial number

Quicksilver parts are designed and validated by a company with decades of marine engine manufacturing expertise, delivering the quality and precision that professional technicians and boaters rely on.