The 5 Best Boat Motor Flushes (2023 reviews)

It is great for the boat motors that need the extra force of water to flush your system. You can connect this boat motor flusher to a standard garden hose and help keep your motor clean by flushing away sand, salt, silt, and mud. It fits nice and snug and the "muffs" are a bit bigger and cover the intakes better. It is made from fuel resistant material.

This is the proper tool to properly flush an outboard or an I.O. The metal bracket keeps the device tightly against the outdrive. It is great for running your bost for maintenance of course but for salt water flushing it puts more water through the engine faster.

Why We Like This:

Ideal for a salt water engine
Sturdy, works perfect on the mercruiser
Double side feed is a great idea for engine flushing and so simple
Very nice to flush the motor and work on the motor in the yard

Best runner up: Attwood Boat Motor Flush

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We are personally inclined towards attwood boat motor flush, it is not so pricy, but it overachieves its purpose and outstanding in important aspects. This Attwood universal motor flusher quickly and easily flushes away materials such as salt, sand, silt, and alkali to prevent clogging and corrosion of an engine cooling system. It clamps over them and provides water flow to the water pump. It fits snugly and forces water into the engine. It squeezes over the inlet grate on the lower unit of the engine very tight. The molded cups deliver fresh water to flush the cooling system through the side intakes on the lower unit. The plastic hose attachment is a little difficult to use and can easily be crossed threaded. It won't pop off with high water pressure.

Why We Like This:

Easy to use, flushes motor well
Easy to install, and works perfectly
Delivers what they promise

Best For rubbing Engine: ISURE Marine Boat Motor Flush

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The isure marine boat motor flush is capable of outshining several other flush featured in this list in overall features for the price point. This flusher fits most johnson / evinrude, mercury, yamaha, chrysler, force, honda, nissan, suzuki, and tohatsu. It provides an ample amount of water to run the motor. It fits a wide variety of engines. There is an extra piece (other connector) inserted into the hose connector.

Why We Like This:

Flushes contaminates fromthe cooling system and allows idling for engine adjustments, installs in seconds
Easy installation, requires no tools for installation or removal
New and hot release

Best For larger motors: seasense Boat Motor Flush

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The seasense boat motor flush is capable of outshining several other flush featured in this list in overall features in its price range. It protects your investment by flushing the motor every time you use your boat. It is great for larger motors 50 hp & up.

Why We Like This:

Flushes salt, silt, and sand out of the cooling system of the motor
Definitely an improverment over single water muff
Dual water muffs, inexpensive, low cost materials that need to be handled gently

Best suction power: Shoreline Marine Boat Motor Flush

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This large motor flusher helps extend your outboard engine’s life by regularly flushing away salt, silt, and grime after use. It is designed for large outboards and helps increase its life by protecting it from contaminants. It is not only clean, but you can also winterize your boat with the help of this essential boat accessory and keep your investment in good condition.

This boat motor cleaner is compatible for larger outboards including Mercury, Yamaha, Evinrude, Mercury, Yamaha, Johnson, Chrysler, Honda, Nissan, Suzuki as well as others. It is to provide customers with the best performing marine products at an affordable cost. You can connect this boat motor flusher to a standard garden hose and help keep your motor clean by flushing away sand, salt, silt, and mud.

Why We Like This:

Product testing and quality control procedures are implemented in house to test each product
Simple to use just hooks up to garden hose
Installs just in seconds and requires no tools for installation or removal