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flushing an outboard

Old 12-07-2011, 03:50 PM
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Default flushing an outboard

I have recently purchased my first boat and was wondering when flushing the motor how long should it be before the tell tail starts expelling water. I ran the motor today for about 5 minutes and no water was coming out. thoughts? its a 2002 4 stroke yamaha.
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Old 12-07-2011, 04:13 PM
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Should be a matter of seconds..Did u use Muffs that supply water on both sides? The 4 strokes require a lot of water
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Old 12-07-2011, 05:21 PM
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yeah I had the muffs with water running in both sides and i also hooked it up to the freshwater hook up any idea??
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Old 12-07-2011, 05:33 PM
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Originally Posted by Jclint1 View Post
yeah I had the muffs with water running in both sides and i also hooked it up to the freshwater hook up any idea??
When you use the fresh water hook up, you Don't run the engine, You only run the engine when on the muffs.
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Old 12-07-2011, 05:38 PM
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Some Yamahas require the lower unit to be under water as in a 55 gal drum in order to get sufficient flow for the indicator to work. If still no indicator then you need to look at the waterpump system.
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Old 12-07-2011, 05:46 PM
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I had the muffs on with the engine running and when i noticed that it was not flushing i turned it off and ran it through the fresh water flush, with out the motor running.
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Old 12-07-2011, 05:50 PM
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You may not have had enough water pressure to flush it fully with the muffs on. I would just hook up the water hose to the fresh water attachment. Was the water coming out correctly when it was hooked up that way?
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Old 12-07-2011, 05:52 PM
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No it was not flowing out that way either, I saw an air bubble come out when it first started then nothing leading me to think it is clogged, what do you think?
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Old 12-07-2011, 06:49 PM
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i have had my share of tell tale troubles on my omcs..yes they do clog try running a wire up the tell tale or back flushing if possible...you didn't mention if it worked under normal operation..[.if you need to submerge an engine in a 55 gal. drum to flush it something is wrong]...take out the stupid like mentioned hose pressure or kinks and such[how many problems been solved with the old"for god sakes!!!"]..make sure w/p operation,screens,temp ect... kinda important that it works correctly as tell tales do just that..let you know trouble maybe brewing..good luck
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Old 12-07-2011, 07:24 PM
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Default A good tool to use

is the hard plastic line used on weed eaters. It's stiff enough to run down the tube and put pressure on whatever has your pisser stopped up. Some have reported theirs was stopped up , due to dirt daubers, etc. It can get stopped up in shallow water where grass and mud might get in it, as well.
You might consider reading your owners manual about how to best run it on fresh water. I don't have any experience with a 4 stroke, so no help here. You might talk with a shop foremen or mechanic at a Yamaha dealer, also. If you don't have a shop manual for your engine, I suggest you get one, especially if you are at all mechanically inclined. It can save you a lot of money over time.
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Old 12-07-2011, 07:30 PM
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On a big block Yamaha Get a spliter and run muffs and connect to the flush outlet. Also remove the plastic guard On the pickup on the lower unit.
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Old 12-07-2011, 08:46 PM
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the tell tails routinely get plugged up with debris... that little spout is the sallest part of the entire cooling system and it's at the end of the circut. Just because there is no water flowing from the tell tale does not necessarily mean that the motor is not cooling properly.

What is the HP rating on your fourstoke?

DO NOT TRY TO RUN YOUR MOTOR ON THE UPPER FLUSH ATTACHMENT ONLY. It will not provide enough water down at the impeller and you will burn it up quickly. As a previous poster noted you may have to provide water to both the flush attachment as well as the muffs if your trying to run a larger V6, but anything smaller than that, the muffs are sufficient.

Has the gearcase been pulled off recently? It is very easy to miss the water tube when you reinstall the case.
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Old 12-08-2011, 06:07 AM
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When I run the split to the muffs and freshwater flush should i be running the motor?
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Old 12-08-2011, 06:09 AM
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Originally Posted by monk E View Post
the tell tails routinely get plugged up with debris... that little spout is the sallest part of the entire cooling system and it's at the end of the circut. Just because there is no water flowing from the tell tale does not necessarily mean that the motor is not cooling properly.

What is the HP rating on your fourstoke?

DO NOT TRY TO RUN YOUR MOTOR ON THE UPPER FLUSH ATTACHMENT ONLY. It will not provide enough water down at the impeller and you will burn it up quickly. As a previous poster noted you may have to provide water to both the flush attachment as well as the muffs if your trying to run a larger V6, but anything smaller than that, the muffs are sufficient.

Has the gearcase been pulled off recently? It is very easy to miss the water tube when you reinstall the case.

It did flushed properly a few weeks ago its only after this last run I did where I got pretty shallow a few times fishing in the marsh that it had a very weak stream and then nothing
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Old 12-08-2011, 06:16 AM
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Have you checked the owners manual?
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Old 12-08-2011, 06:23 AM
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It is ok to run the motor on muffs if THEY are causing the water to come out of the indicator. No water from indicator = do not run engine until problem is resolved. If you are running water to the "flush" adapter as well and water is coming out of the indicator you still may have an impeller problem. As I mentioned earlier the only way to be sure the waterpump is working is to submerge the lower unit in a water body, test tank or 55 gallon drum above the water intake levels. If no water indicator at that point then you either have a clog somewhere in the system( could be just the indicator hose) or a failed water pump.
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Old 12-08-2011, 06:42 AM
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Yamaha says not to use muffs...
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Old 12-08-2011, 06:51 AM
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Originally Posted by monk E View Post

DO NOT TRY TO RUN YOUR MOTOR ON THE UPPER FLUSH ATTACHMENT ONLY. It will not provide enough water down at the impeller and you will burn it up quickly.
I dunno. My fishing partner has 1200 Hours on his 2005 F225, and has not once, ever used muffs, he only uses the flush port and runs the engine while on the flush port after every trip for 10-20 minutes or so. Water comes out of his tell-tale fine.

We do his impeller every 200-300 hours and the old one is always perfect. In fact, we havent bothered to replace the housing or wear plate yet either.

Never a single cooling related issue. I too, have run my Yamaha engine while on the flush port and never 'burnt' up an impeller.

I'm not saying that's what I recommened anyone do, and I know what the book says..I'm just saying I dont think it's as 'bad' as people think, judging by what I've seen from that F225..

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Old 12-08-2011, 07:11 AM
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Originally Posted by Jclint1 View Post
It did flushed properly a few weeks ago its only after this last run I did where I got pretty shallow a few times fishing in the marsh that it had a very weak stream and then nothing
For anything smaller than a V6 the muffs are fine to run the motor on.

When you got into the shallows you may have sucked up some debris that could have worn out your impeller. When was the last time it was serviced by a Yamaha dealer?

On most of the fourstrokes you can access the water tube inside the cowl that feeds the tell tale, if the tell tale is clogged you can just pull the tube off and see if water is indeed streaming. If you don't have any water flowing through that tube, or if you don't have any access to it, then bring your boat to a Yamaha dealer and have them inspect your water pump.
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Old 12-08-2011, 07:22 AM
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Make you signature smaller for the love of God. Monk E
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