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Old 07 October 2004, 12:03   #1
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15hp Mariner stalls at low RPM

I have a 15hp 2 cyclinder 2 stroke mariner outboard. It's used regularly, however, on Tuesday it stalled when it was idling in neutral. This happen a couple of times in one outing.
Anyway, took it out again today and the problem got worse. It stalled every time I let the revs go below about 1000rpm. As it stalled more and more times it got harder and harder to start. I estimate that it must have stalled about 30 times in a 2 hour trip.

Does anyone have any good ideas as to how to sort the problem before I take it to an expensive repair person?

Thanks in advance!
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Old 07 October 2004, 12:08   #2
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What does it do as it stalls?
Misfiring?
Running on 1 cylinder?
Excessive smoke?
Backfiring through the carb?
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Old 07 October 2004, 12:16   #3
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It just stops like I've hit the stop button. When it does start up again theres a lot of smoke, but thats after a lot of pulling on the cord!
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Old 07 October 2004, 12:23   #4
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Start with electrics (IMHO of course ). Warm it up properly and wait for it to stall. Stick a plug on each HT lead and check for a healthy spark on each.
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Old 07 October 2004, 13:01   #5
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This sounds very much like the same problems we have had with 3 cylinder Yamaha auto lube engines.
Is your engine auto lube or pre-mix?
If its auto lube my guess is blocked slow running jet in one or both of your carburettors, we have had this more times than I can remember with the auto lube system but never with the pre-mix.
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Old 07 October 2004, 13:02   #6
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It's a premix model.
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Old 07 October 2004, 14:03   #7
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I still put my money on the electrical system, but if you want to test if it's blocked jets, pop into yer local model aeroplane shop and get a primer bottle. Stick some 50:1 in it. After the engine stalls and won't restart, squirt some premix down the carb throat and see if it fires again.
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Old 07 October 2004, 14:09   #8
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Oh well keep that idea on the back burner for a while, it could still be blocked jets but a little less likely with pre-mix, they are usually have larger holes to allow the oil & petrol mix through. Unless you have got some dodgy fuel with a lot of crud in it (it can & does happen)
first move is to check the plugs as suggested by MadMat, it may also be worth checking the kill switch.
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Old 07 October 2004, 14:12   #9
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Yeh. Basically look for a spark and fuel and then work backwards to diagnose it.
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Old 07 October 2004, 14:31   #10
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Will do. (This one doesn't have a kill switch on it).

As a footnote, it helps greatly starting it when I pull the choke out.....
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