With flush muffs, run the engine only at idle speed in neutral for a few minutes while monitoring it at all times for proper water flow out of the tell-tale outlet. A garden hose is attached to fill it and keep water circulating; the engine is then started and run much the same fngine with a flush muff attachment. Get a Quote. Manufacturer's Recommendations Most outboard manufacturers' flushing recommendations are similar. So, engine flush bitog 90 is the way to go.

Water pressure should be between 20 and 40 psi. You can buy a pressure gauge attachment at a hardware store to monitor psi. Flush for at least five minutes at an idle speed, with the engine in a vertical position.

When using the flushing port, it is not necessary to run the engine. Keep the engine vertical after flushing so that all water drains from the powerhead. Honda's flushing procedure varies by engine size and model. In all cases, the engine must be in the vertical position during flushing and after, to drain the water from the engine. Smaller engines 2 to 20 hp : Flushing in a small container such as a flushing bag, small bucket, or can is acceptable. For engines 5 hp and up, an optional flushing attachment Honda part ZV is available that allows flushing the engine through a port on the side of the gear case.

The prop must be removed and the engine run for about five minutes with either procedure. Either method is acceptable. Again, the engine must run, with prop removed, for about five minutes. 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. Larger engines 60 to hp : Honda's only recommended flushing procedure is to use the factory flushing port connected to a garden hose with the engine not running.

Mercury's procedure varies by engine size and series. Smaller and midsize four-stroke outboards use the flush port at the rear of the engine. The engine must be warmed up to open the thermostat and circulate water throughout the engine's cooling passages completely. The engine can be vertical or tilted. Remove the prop, and run in neutral at no more than an idle speed for at least five minutes. The water supply should not be opened more than halfway to regulate water pressure.

Optimax two-stroke outboards: Remove the prop, attach flush muffs so that the rubber cups fit tightly over the water intakes, then adjust water flow so that some water leaks out around the cups. Start the engine and run at idle speed in neutral for three to five minutes. For flushing without muffs, Mercury offers a garden-hose adapter that connects to a port in the lower engine cowl; this port is accessed by removing a dust cover. Mercury makes special note of using this adapter to drain the cooling water from the engine by disconnecting it from the water-supply hose, then tilting the engine to allow all the water to drain out.

This is especially important in freezing climates. Water pressure no higher than 45 psi should be used. The engine can be running or not when flushing, and flushing should be for at least three minutes. Mercury notes that this procedure should be Engine Flush Bitog Noise used when flushing the engine after use in salty or dirty water, and also as a part of preparing the outboard for storage.

Verado four-stroke outboards: No description of using flush muffs is shown in the manual, only the engine's hose-adapter fitting. The description of the procedure is short, noting only that the engine should be off and can be either tilted or vertical. The preferred method is to flush with a flush-muff attachment or built-in port.

With flush muffs, run the engine only at idle speed in neutral for a few minutes while monitoring it at all times for proper water flow out of the tell-tale outlet. There are two possible flushing ports — one on the port side of the engine midsection, the other on the front side of the lower cowl.

The engine can be running or stopped; flush for about five minutes, and ensure the engine drains completely. When not running, the engine can be flushed in the tilted position, but must be returned to the vertical position to drain afterward. For smaller engines 2 to 6 hp , use either the optional flushing plug or a small container such as a garbage can or tub filled with fresh water. For larger engines, use the flush port or a set of flushing muffs. Water pressure should be set to one-half or more to ensure adequate flow to the intakes.

The engine should be run for five to 10 minutes. Yamaha gives three choices — with a flush bag, muffs, or hose-port connector and says all three Engine Flush Bitog Kr methods work equally well. Bag and Muffs: Engine should be vertical, run no more than rpm in neutral for 15 minutes with the prop removed. Be sure the engine is receiving cooling water by checking the overboard indicator. If your outboard has more than one set of cooling inlets, a flush bag should be used.

Flushing Port: Engine should not be running; it can be tilted or vertical. Prop should be removed. Flush for minutes. We use cookies to enhance your visit to our website and to improve your experience. Membership Search. Service Locator. Get a Quote. Become a Member. Renew Membership. Boat Insurance Membership. Boat Towing Boat Lettering. The synthetic oil will clean the engine slowly over time without washing all the junk thru the bearings. So, syn is the way to go. Synthetic doesn't clean your engine any more than regular oil.

Neither is designed to clean your engine any better than the other. There's 2 components to oil: 1 The oil - who's job is to lubricate 2 Detergent package - which neutralizes bad stuff in the oil. The natural oil goes through a lot of purification processes to get it cleaned up as much as possible, but there's still some very little bad stuff. Some of the detergent package is used up to neutralize this bad stuff, and the rest of the detergent package is there to handle what the engine throws at it.

Synthetic's start with a cleaner base than dinosaur oil though standard oil has come a long way in the last few years, and is much closer to synth than people think , so more of the detergent package can be used to neutralize bad stuff from the engine.

But, most people change their oil every 3, miles anyway - instead of the 6, - 24, miles depending on brand that synthetic's designed to last - totally negating the reason you pay 4x as much for the stuff.

By the way, government standards have pushed regular oil much further, and even the cheapest oils are required to last at least 6, miles now.

That's it - that's the difference. It's not blessed by a Greek God to do joo joo magic in the engine like most people seem to think. It's good for your engine, and won't wreck your bearings - that's what a good oil filter is for check BITOG site for info on filters.

You may be right but I know for a fact Mobil 1 will clean up an engine because I have seen it do it. The garage I worked in a few years ago had a dodge truck that was gummed badly and although it took a few oil changes the Mobil1 did the job. If you use synthetic you better check your oil level every day.

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