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Old 06-09-2012, 12:20   #1
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Engine Cutting Off

I have a 2004 Nissan 6 HP that I have trouble with choking off at low idle. It will do this even when completely warm. So far I have mitigated this by running it at a higher RPM and taking it in and out of gear. I wouldn't consider this a problem except that sometimes it can make docking a little more exciting than I would like. I have cleaned the carb and put new gas through it without much change. Is there something I can adjust with the carb or should I just adjust the throttle cable and accept operating at the higher RPM?

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Old 06-09-2012, 14:34   #2
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Re: Engine Cutting Off

There should be an idle screw adjustment on the carb that varies the fuel to air ratio. An increased fuel flow should increase the idle revs.


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Old 06-09-2012, 18:24   #3
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Re: Engine Cutting Off

If the filter is transparent you can try running with the cover off and see if an air gap forms in the filter.

Sometimes an air leak in the fuel system can starve it at idle but increased flow at higher rpm sorts it out.

Also the idle jets are teeny tiny. When you say you cleaned the carb was this just spraying some cleaner on it/through it or a disassemble?
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Old 06-09-2012, 21:07   #4
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Re: Engine Cutting Off

I assume this is an outboard. If so look at Youtube for videos on how to adjust an idle screw on motorcycles. This will run you thru the process of getting the idle to run properly.
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Old 06-09-2012, 21:29   #5
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Re: Engine Cutting Off

One more note; If you've been running gas-ohal, this may be clogging up the jet in the carb. With my old Honda 4-stroke I use to carry and extra jet and a small piece of wire to clean the old one.
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Old 06-09-2012, 21:39   #6
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Re: Engine Cutting Off

I think Delmarry has the right answer. The first sign of carb problems in an outboard engine that's been using ethanol is the inability to idle properly.
Like I've said in many posts I disconnect the fuel line and run the engine dry each time I put it away.
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Old 07-09-2012, 13:47   #7
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Re: Engine Cutting Off

Running at too high an idle speed is hard on the gears in the lower unit when you shift and not recommended.

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