Impeller Johnson/Evinrude 1.5-6 HP – Key Cooling Component for Portable Engines

The Johnson/Evinrude 1.5-6 HP impeller is vital for the miniature outboard engines used on canoes, small dinghies, and inflatables. It replaces the original impeller with OEM part #387361, restoring full water pump capacity in engines from 1.5 to 6 HP (two-stroke). Even in such small motors, proper cooling is paramount – this impeller, with its 6 blades and inner diameter of about 10.94 mm, provides steady water circulation and keeps the engine within optimal temperature limits.

Constructed from a high-quality elastomer, the impeller withstands frequent heat cycles and prolonged low-speed running typical of small engines. Replacing it regularly (for example, at the start of each season) will ensure that your 2, 3, or 5 HP motor won’t overheat even on a hot summer day. Installation is straightforward – simply remove the engine’s lower unit, swap out the old impeller for the new one, and ensure the drive key is properly in place. The Johnson/Evinrude 1.5-6 HP impeller is a small and affordable part, but it plays a big role in keeping your motor reliable on the water.

• Mini Engines, Maximum Protection: Made for portable outboards often carried by hand – this impeller keeps the “heart” of the motor (cooling system) healthy so your 1.5–6 HP engine starts easily and runs smoothly
• Typical Models: Compatible with classic Johnson/Evinrude models such as the 3HP “Duck Twin,” 4HP & 5.5HP Seahorse, 6HP Yachtwin, and other small engines from the 60s, 70s, and 80s
• Prevents Overheating: Small engines have less thermal margin – a good impeller ensures a constant tell-tale stream of cooling water, indicating the engine is being cooled. If that stream weakens, it’s time to replace the impeller
• Low Cost, High Benefit: As an inexpensive consumable, the impeller can be replaced regularly with minimal cost, yet it prevents expensive repairs like melted pistons or blown head gaskets caused by overheating
• Be Prepared: Keep a spare impeller on hand, especially if you operate your motor in remote areas – a replacement takes only about 30 minutes and can save your trip if the old impeller fails