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Old 16 September 2010, 00:27   #1
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Country: USA
Town: Rhode Island
Make: avon
Length: 6m +
Engine: 90hp merc
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help, mercury over reving

I have a 2003 50 hp mercury 2 stroke carburated model. I ran it on a serider 4.0 the other day to find out what prop i need, the boat strted and ran fine for a bit, the prop was pitched too low and i quickly hit my rev limiter, When I throttled down my motor continued to rev at 3000 rpm. if I shifted it into neutral it it would continue to rev and I would have to shut it off, When I started it again I had to shift it into gear right away before it reved too fast, Any ides what I have to do, thanks
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Old 16 September 2010, 03:11   #2
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Country: UK - England
Town: Scillies
Boat name: Freedom
Make: Searider
Length: 5m +
Engine: Yam 2st 90
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I'd start by adjusting the throttle cable at the engine end.

I had to do this when I put the 90 onto my SR.

Ian
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Old 16 September 2010, 03:11   #3
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Country: UK - England
Town: Scillies
Boat name: Freedom
Make: Searider
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Engine: Yam 2st 90
Join Date: Jan 2007
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Where in RI BTW. I lived in Newport for 3 years.

Ian
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Old 16 September 2010, 13:44   #4
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Country: USA
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i am in the providence area. as for adjusting the cables, the motor idled fine for a bit but then it was like the gas was stuck open. Now if i start the motor it idles for a second then starts to rev up very high . could this be something as simple as a stuck valve in the carb? could I just spray some carb cleaner into the carbs and try to loosen up somethings?
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Old 17 September 2010, 04:22   #5
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
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Engine: Merc 60 Clamshell
MMSI: 235068449
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Posts: 4,610
If it suddenly started happening, has the return spring fallen off?
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Old 17 September 2010, 14:31   #6
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Country: USA
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yes it suddenly happend, it might have been a bit high before but after about ten minutes of good use i went to slow down but the gas never slowed. it sounds like it wont stop in neautral, it would just keep climbing if I dont shut it off. All linkage looks to work find. carb valves are closed when they should be and opens up fine when accelerating but even when completely closed the motor wants to run
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Old 20 September 2010, 08:16   #7
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
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Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
On mine, the choke is actually an enrichening valve (i.e chucks more fuel in and ignores the airway completely). Assuming yours is the same, I wonder if that's sticking open?
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