Tohatsu 2.5–4.5 HP Impeller (Mercury/Johnson) – 6-Blade Mini Pump Impeller

This mini impeller is designed for the lowest horsepower outboards, giving them the same reliable cooling as larger motors. It is compatible with Tohatsu and Nissan engines of 2.5–4.5 HP, which often underpin the small Mercury/Mariner 2.2, 2.5, 3.3 HP four-stroke motors, as well as some Johnson/Evinrude 2–4 HP water-cooled models (late 90s era). With its 6 blades, this impeller effectively circulates water through the small engine block – vital because tiny engines have limited coolant volume. The impeller maintains a steady tell-tale stream, assuring you that the little motor won’t overheat during your ride.

OEM-standard execution means this impeller is a direct replacement for original parts – for example, Mercury #47-95289-2 or Tohatsu #369-65021-1. The hub and blade dimensions match up, ensuring a snug fit on the water pump shaft and efficient drive. Installation is simple: even in the field with basic tools, you can drop the small engine’s pump and swap the impeller in short order. Owners of mini outboards often use them for short trips – but even over short distances, overheating can be an issue without a good impeller. That’s why regularly checking (and replacing if needed) the impeller is key.

The little Tohatsu/Mercury 2.5–4 HP motors are frequently used as auxiliary engines on sailboats or to power lightweight inflatable dinghies and canoes. This impeller ensures that even under max load (for example, pushing a dinghy against wind or current), the cooling will be sufficient. On hot summer days when the small engine is working hard, a reliable impeller makes the difference between a smooth trip and an unexpected shutdown from overheating. It’s advisable to carry a spare of these mini impellers, as they are small and light, but in a critical moment can save your engine.

• Johnson/Evinrude Fit: Some of the last 3.5–4 HP Johnson/Evinrude outboards (before small models were discontinued) were Tohatsu-based – this impeller covers those too, ensuring maintainability.
• Tiny Engines – Maximum Protection: Small motors are often run at full throttle; the impeller ensures that even then, heat is effectively carried away.
• Easy-to-Carry Spare: With a diameter of only a few centimeters, this impeller stores easily in your boat’s emergency kit – just in case.
• Quick Fix Afloat: If you notice the cooling tell-tale missing on your small engine, this impeller allows an on-the-spot swap even at the beach or at anchor, after which you can continue your trip.
• CEF Reliability: Italian manufacturer CEF is known for quality spares – this impeller is no exception, offering a blend of affordability and high reliability.