Reply
 
Thread Tools Search this Thread
 
Old 16 September 2010, 05:27   #1
Member
 
Country: USA
Town: Rhode Island
Make: avon
Length: 6m +
Engine: 90hp merc
Join Date: Mar 2006
Posts: 326
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
__________________
learning to fly is offline   Reply With Quote
Old 16 September 2010, 08:11   #2
Member
 
Country: UK - England
Town: Scillies
Boat name: Freedom
Make: Searider
Length: 5m +
Engine: Yam 2st 90
Join Date: Jan 2007
Posts: 335
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
__________________
walruz is offline   Reply With Quote
Old 16 September 2010, 08:11   #3
Member
 
Country: UK - England
Town: Scillies
Boat name: Freedom
Make: Searider
Length: 5m +
Engine: Yam 2st 90
Join Date: Jan 2007
Posts: 335
Where in RI BTW. I lived in Newport for 3 years.

Ian
__________________
walruz is offline   Reply With Quote
Old 16 September 2010, 18:44   #4
Member
 
Country: USA
Town: Rhode Island
Make: avon
Length: 6m +
Engine: 90hp merc
Join Date: Mar 2006
Posts: 326
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?
__________________
learning to fly is offline   Reply With Quote
Old 17 September 2010, 09:22   #5
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
If it suddenly started happening, has the return spring fallen off?
__________________
9D280 is offline   Reply With Quote
Old 17 September 2010, 19:31   #6
Member
 
Country: USA
Town: Rhode Island
Make: avon
Length: 6m +
Engine: 90hp merc
Join Date: Mar 2006
Posts: 326
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
__________________
learning to fly is offline   Reply With Quote
Old 20 September 2010, 13:16   #7
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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?
__________________
9D280 is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT. The time now is 23:41.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2025, vBulletin Solutions, Inc.