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Old 01 August 2004, 16:09   #1
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Country: UK - England
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Outboard hassles

Have a newish 4 stroke suzuki 6hp. 25 hours. Set it up on the driveway with a hose in the water inlet as per the manual. Started her up as normal. Water flowed fine. No problems with starting or running 1/4 throttle or more.

BUT - close to idle she runs ragged and stops. Checked fuel line, plug, all that. Runs sweet as anything at higher throttle. Changed the engine oil anyway...

But am concerned.

Could it be something to do with the fact that I am running it with the hose, rather than in the sea? Or do I have an idle speed problem or what?

Any ideas?

Anyone know who I can take it to near Aylesbury so I can get it sorted before going to IOW at end of week?

Any diagnostics I can try?

Thanks

Bruce
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Old 01 August 2004, 16:13   #2
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OK, now I'm not saying you're being daft, but because you're in a different environment to when you usually run the engine (ie on the boat)...

did you open the air vent on the tank?
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Old 01 August 2004, 16:33   #3
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Yes, but

I think I checked everything. But, just possibly it was not as open as I usually have it. Would that be sufficient to upset it at idle? Last time I used it was with an external tank. I have not used the internal tank for about three months.....
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Old 01 August 2004, 16:39   #4
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If you havn't used the internal tank for a few months is there a chance the petrol's past it's best?
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Old 01 August 2004, 16:40   #5
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Bad petrol

No, fresh petrol today from local petrol station.

How do you diagnose these problems, generally? It all seems a bit of a black art!

Bruce
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Old 01 August 2004, 17:02   #6
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I doubt that the petrol's that far past it's best (but hey, famous last words!)...

Diagnose problems like this by getting over the simple stuff first! And remember an engine needs fuel, air, water, a spark and oil (sump oil for 4-s, mixing oil for 2-s). Fuel and spark are the usual suspects.

Also, have you definitely switched to the correct tank?
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Old 01 August 2004, 17:53   #7
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Tank

Yes, corrrect tank

Fuel line looks clear

Fuel visible in the tank. Correct tank selected.

Runs fine at higher revs

Spark plug taken out and carefully had a cloth pulled through the gap - no signifcant deposits

Ran brilliantly on external tank 2nd June

Not touched it since then. Came down in the car on its correct side. Then stood it up in garage. Ran water through it very briefly after journey down, but confess did not run it at idle as is it was cold so would not have noticed if there was an idle problem then.

Could it be that the oil, which was very black when I changed it, was the problem?

I have not run it since it kept cutting out at idle for fear of harming it. Changed the oil and then put it back in the garage without starting it.

Air intake looks fine. Stated normally so electrics likely to be ok.

Am still mystified.

If I am getting inadequate water throgh the hose (the cornnector does leak), could that explain the problem.

Tempted to set it up tomrrow in a bucket of water and try it again, having checked everything.

Otherwise, where could I take it to near Aylesbury? Any ideas

Thanks

Bruce
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Old 01 August 2004, 18:01   #8
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Surely a lack of cooling water wouldn't cause it to idle roughly.....
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Old 01 August 2004, 18:03   #9
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Quote:
Originally Posted by brucehawsker
Tempted to set it up tomrrow in a bucket of water and try it again, having checked everything.
Go for it!

My suggestions now become more amateur as I don't have specific knowledge of your engine, but your logic sounds good. Start from the beginning and make sure everything's set up OK. I use a bin with water in to run my aux. at home - this would eliminate any water supply problems (I don't think they should affect it in that manner but overheating can cause strange symptoms AFAIK!

I don't know about outboard repairers up country - you may be better to take it to iow with you and find a repairer down there.

HTH!
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Old 01 August 2004, 18:07   #10
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Running in a bin

How much of the leg needs covering to run the motor in a bin of water to be safe?

Thx

Bruce
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