![]() 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.
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