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Author Topic:   Flushing Yamaha, Honda, E-TEC Engines
Graybay posted 05-25-2015 03:41 PM ET (US)   Profile for Graybay   Send Email to Graybay  
The manual for my Yamaha F50 says to flush with fresh water for 15 minutes after use. Under many circumstances this is an inordinate amount of time. I try to flush the engine after every use, but 90-percent of the time the boat is cleaned up, gear put away, and we are ready to leave the dock before that. How many folks do the full 15-minute flush every time? Is 10-minutes good enough? Five minutes maybe? What is the real world on this?
Eddie M posted 05-25-2015 05:31 PM ET (US)     Profile for Eddie M  Send Email to Eddie M     
I always flush for a minimum of 15 minutes. My thermostats look clean and the water passages are as clean as new. Only problem is I go in the house and forget the damn thing is still running.
Jefecinco posted 05-25-2015 07:07 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Assuming you flush with the engine running it may require 15 minutes of warm up in order for the thermostat to open.

I launch at ramps and rinse water is unavailable there so I do my flushing at home and tend to a good trailer flush at home also.

I'm not sure how necessary it is to flush after fresh water use. Salt or brackish water use certainly necessitates flushing afterward.


martyn1075 posted 05-25-2015 07:50 PM ET (US)     Profile for martyn1075  Send Email to martyn1075     
Any fresh water going through there is much better then nothing at all so If you have 15 mins good, if not I will take 5 in a pinch no problem.


weekendwarrior posted 05-26-2015 08:14 AM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
My 1999 Honda has a similar requirement for flushing. It gets 99-percent saltwater use, and I do try to flush more than 10 minutes whenever possible. There are some salt deposits on the thermostat when I change it occasionally. I flush at home, so I'm not rushed like I might be at a public place, so my procedure is to start the motor flushing and let it run while I empty the rest of the boat. If that goes quickly, I use my second hose to wash the boat while the motor continues flushing.
lizard posted 05-24-2015 03:57 PM ET (US)     Profile for lizard  Send Email to lizard     
A friend has a newer E-TEC 75-HP. He was told by the shop that installed the motor to flush with water after each use. I always used Salt-Away. What do other use to flush their motors? I remember at some point someone suggesting diluted acetic acid (white vinegar). Trying to help a buddy out who is new to Whaler ownership.


Jefecinco posted 05-25-2015 07:00 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
I use fresh water to flush my engines after use. I see no need for vinegar or salt away.

I believe salt away is useful to help rid the exterior of an engine with the cowling removed after use in salt water if salt deposits are present. Liberal use around tilt & trim and steering hose and all cables is recommended if a water spray fails to free them from salt.


jimh posted 05-26-2015 09:18 PM ET (US)     Profile for jimh  Send Email to jimh     
The few times I have had my boat in saltwater, I try to find a freshwater lake on the way home to dunk the boat and trailer and run the engine. If no lake available, then a good wash down with a hose and a run on the hose adaptor.
tedious posted 05-27-2015 01:27 PM ET (US)     Profile for tedious  Send Email to tedious     
Gray, your motor is not going to disintegrate if you flush for less than the allotted time.

For people like me who keep their boats on a mooring, the only time the motor sees a hose is after hauling.

My 2005 F200 is in salt water from May to October; it gets flushed when I haul it in the fall. My 2010 F70 is usually in the water for several 2-week periods during that interval, and it gets flushed only when I haul it.

Do what's convenient - more is better, but none at all is OK too.


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