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Old 04 July 2010, 11:57   #1
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Mariner 50hp 4 stroke tickover problem

The tickover is a little unpredictable - sometimes it is fine, ticing over at just under 1000 rpm and going into gear lovely but sometimes the tickover rises to approx 1600 to 1800 revs,

I have cleaned out and balanced the carbs and put new plugs in.

I was thinking an air leak may cause these symptoms?

any ideas?

thanks
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Old 04 July 2010, 13:14   #2
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When does it rise? Any particular time?
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Old 04 July 2010, 13:46   #3
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No it was random, i was using the boat to potter around the non tidal thames 4 / 5 knots and 1800 / 2000 rpm and it was when slowing down and waiting for the locks ect ( which is pretty often... )
At some locks it was fine and some it was not.

May have been my imagination but when it was playing up when i lifted the cowling the revs would fall then when i put the cowling back on they would rise again..
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Old 04 July 2010, 14:47   #4
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Dunno if its relevant at all but my car has a similar problem, which is caused by a faulty throttle sensor, if your engine has such a thing could be something to look at.
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Old 04 July 2010, 14:53   #5
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I dont think it has one as it has Carbs rather than EFI.

( Unless someone can tell me otherwise? )

Thanks for the suggestion.....
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Old 04 July 2010, 15:49   #6
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Sounds like what my aux was doing when the carb was full of poo - are you sure you found all the jets? I didn't, the first time I took mine off...
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Old 05 July 2010, 16:50   #7
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idle

HOW have you balanced these UP ??? Have you set the bottom carb to 1000rpm and then vacuumed the others . ALSO what gauges are you using . SORRY im NOT being difficuilt here but I have had alot of issues with BAD GAUGES and gauges that DO not work properly . Also what are your mixture screw settings . I would really like to know the make of the gauges ?? Barry
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Old 05 July 2010, 16:52   #8
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carbs

I think your issue is STILL carburation . did you get those small intermediate jets out ??
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Old 06 July 2010, 03:57   #9
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Originally Posted by BogMonster View Post
Sounds like what my aux was doing when the carb was full of poo -.
Sh*t in the carb?
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Old 06 July 2010, 12:08   #10
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Sh*t in the carb?
Is that the problem, or the solution?
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