The water supply should not be opened more than halfway to regulate water pressure. Remove the prop, and run in neutral at no more than an idle speed for at least five minutes. The engine must be warmed up to open the thermostat and circulate water throughout the engine's cooling passages completely. Smaller and midsize four-stroke outboards use the flush port at the rear of the engine. Mercury's procedure varies by engine size and series. Larger engines (60 to 250 hp): Honda's only recommended flushing procedure is to use the factory flushing port connected to a garden hose with the engine not running. Honda warns that if water pressure is low, tape should be used to close off the engine's water intakes on each side of the gear case. Again, the engine must run, with prop removed, for about five minutes. Midsize engines (25 to 50 hp): Use only the factory "WASH" port located in the lower port/left side of the gear case. The prop must be removed and the engine run for about five minutes with either procedure. Smaller engines (2 to 20 hp): Flushing in a small container (such as a flushing bag, small bucket, or can) is acceptable.įor engines 5 hp and up, an optional flushing attachment (Honda part #06190-ZV1-860) is available that allows flushing the engine through a port on the side of the gear case. In all cases, the engine must be in the vertical position during flushing and after, to drain the water from the engine. Honda's flushing procedure varies by engine size and model. The engine should be kept in neutral and not run above a fast idle speed (1,000 rpm maximum).Watch the engine's "tell-tale" overboard water indicator to ensure that the engine is pumping water. Be vigilant, and don't leave the engine while flushing.When attaching the muffs, be sure they cover the water inlets completely and don't pop or slide off when the water is turned on.These can be purchased from aftermarket shops. If your engine doesn't have water intakes on the sides of the gear case, you will need a special type of flushing attachment that covers the front of the gear case.If your engine has additional water intakes that are not being directly fed water via the flushing muffs, they must be sealed off with a bit of duct tape, or overheating may occur.That's it, with the following precautions: Connect to a garden hose, fit the muffs over the engine's water intakes on the sides of the gear case, turn the water on, start the engine, and let it run. Flush muffs are the most common way to flush an outboard they're available at most marine stores and online resellers.
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