Chris V, flushing motor opinion...

General Boats and Motors
1

What’s your opinion on flushing an outboard?

  • Yamaha owners manual says flush only through the flush attachment without running the motor.
  • I’ve heard muffs provide a better flush and you should always use them instead.
  • Could do both every time, but seems redundant/ waste of time/ waste of water.
    What are your thoughts, Chris V?
    Or anyone else’s on here.
2

use a Y hose adapter(or two water sources) and flush thru the flush fitting and thru muffs at the same time. Its what Yamaha recommends for running any of the HPDI engines when servicing. You’ve got to supply enough water to fill the block and run long enough for the thermostats to open. Its going to take longer than most people think. As far as a waste of water, how much does that water cost vs. the cost of corrosion?

3

Back when I had my 26’ Sailfish w twins, I’d always flush the engines using a plastic drum, when I could. My thought was that this is how the engine “normally” draws the water in, therefore is the best method. I do this w the small boat I run now. Main thing to watch out for tho is the water in the drum warming up too much. To overcome this obstacle, I would C-clamp the hose to the drum and continually run cool water into the drum. I typically would only idle.

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4

My 2000 Yamaha 200 has been flushed and run on the hose adapter since it was new. Back then, that was what the manual said to do. I just had the impeller changed a couple of years ago and it looked almost perfect with the exception of a little wear and a few small chunks missing. It will not run on muffs alone without overheating but it runs fine on the adapter.

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5
quote:
Originally posted by spareparts

use a Y hose adapter(or two water sources) and flush thru the flush fitting and thru muffs at the same time. Its what Yamaha recommends for running any of the HPDI engines when servicing. You’ve got to supply enough water to fill the block and run long enough for the thermostats to open. Its going to take longer than most people think. As far as a waste of water, how much does that water cost vs. the cost of corrosion?

only thing better than this is a drum of water

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6
quote:
Originally posted by pitviper0404

My 2000 Yamaha 200 has been flushed and run on the hose adapter since it was new. Back then, that was what the manual said to do. I just had the impeller changed a couple of years ago and it looked almost perfect with the exception of a little wear and a few small chunks missing. It will not run on muffs alone without overheating but it runs fine on the adapter.

One Simple Thanks!!

http://www.militaryappreciationday.org

Do you run the engine while hooked up to the adapter, or just have the water on but engine off? My Yamaha won’t pee if hooked up to the adapter.

7
quote:
Originally posted by OccamsRaiser
quote:
Originally posted by pitviper0404

My 2000 Yamaha 200 has been flushed and run on the hose adapter since it was new. Back then, that was what the manual said to do. I just had the impeller changed a couple of years ago and it looked almost perfect with the exception of a little wear and a few small chunks missing. It will not run on muffs alone without overheating but it runs fine on the adapter.

One Simple Thanks!!

http://www.militaryappreciationday.org

Do you run the engine while hooked up to the adapter, or just have the water on but engine off? My Yamaha won’t pee if hooked up to the adapter.

I flush with the engine running. It pees fine and does not overheat.

One Simple Thanks!!

http://www.militaryappreciationday.org

8

What does it mean if you hook a hose up to your flush attachment and nothing comes out of your motor?

9

Dunno. I get water coming out the bottom, but it doesn’t pee with the attachment. I thought I read that you weren’t supposed to run the engine with the flush attachment so I’ve never tried. I usually flush with muffs and the engine running.

10

Back when my motor was new (2000) it was suggested that it be run and flushed through the hose adapter. Some years later, they changed the instructions to say not to run the engine. Mine, when hooked to the hose adapter, pees whether running or not. I have water coming out the foot also.

One Simple Thanks!!

http://www.militaryappreciationday.org

11

The flush attachment is meant to be used without the motor running. The yamaha manuals recommend 15 minutes without the motor running. It is not designed to cool properly with the water hose on the attachment. It is on page 74 of the F150 manual.

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