Choke must be on or 5hp dies

Discussion in 'Dinghies' started by brewster16, Jun 9, 2014.

  1. brewster16

    brewster16 Active Member SILVER Sponsor

    658
    Aug 9, 2009
    Long Beach Island, N.J.
    '07 44 Sundancer
    Twin Cummins QSC 8.3
    First time using the Mercury 5hp this season and after she starts and warms I usually push the choke all the way in and just accelerate with the throttle. This year I have to keep the choke partially on (pulled out) in order to keep the dinghy going. Push it in like I usually do and she stalls right out. Anybody have any ideas on what to do?
     
  2. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    Clean and dip the carb and the jets. It's easy, but you can't cut corners. Those little carbs are sensitive and even a little varnish or crud will cause the idle problems you describe. Soaking helps a lot, but don't soak any rubber parts, which includes the bowl gasket and the tip of the float valve.
     
    Riptide III likes this.
  3. H2ONUT

    H2ONUT Well-Known Member

    Nov 26, 2006
    Savanna GA
    2000 215EC
    5.0 EFI Mercruiser Alpha
    If this is a 4 stroke...

    There is a small brass plug that you can drill out to get to the ONLY adjustment screw for the fuel /air mix. YouTube has some videos on how to remove the brass plug.


    Sent from my iPhone using Tapatalk
     
    Last edited: Jun 9, 2014
  4. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    If you've put much time on it with the choke partially closed, you'll probably want to install a fresh spark plug.
     
  5. Jimmy Buoy

    Jimmy Buoy Well-Known Member

    Dec 3, 2008
    Sarnia, Ontario, Canada
    340 Amberjack
    twin 8.1S 370 Hp + 4.5 Westerbeke Genset
    I had a 2 stroke 5hp that had similar symptoms. Turned out that the switch for fuel flow to come from the internal tank or the fuel line was the problem. It had some type of metal mesh that had turned to metal MUSH and was blocking the fuel flow. I removed the valve and cleaned out the bits of metal and replaced the little in line fuel filter and the motor ran like a champ again. Fuel starvation was the problem. Never bothered replacing the mesh. Always used the internal tank but used this valve as a "shut off" for the engine's fuel.

    Hope yours is as easy!
     
  6. Dieseljeff

    Dieseljeff New Member

    303
    Sep 14, 2013
    Somewhere on the St. Johns River, Florida
    1994 290, 7.4 Bravo, Kohler 4kw
    9.1 Hydro Force dinghy with a Mercury 9.8
    04 Silverado 2500 D/A
    7.4 Mercruiser with Bravo III
    If it runs fine with the choke...it's not getting enough gas. Your carb needs cleaning.

    Jeff
     
    Blown284 and douglee25 like this.
  7. wakeup 19

    wakeup 19 Member

    651
    Nov 14, 2008
    (Medford)Boston Harbor to Cape Ann to Cape Cod and
    1992 300 Sundancer, Quicksilver ding w/ 6hp merc 4 stroke, anchorlift windlass, extended swim platfo
    t/ 350 merc's (carburated) alpha drives gen II
    My external tank line was full of crud! The ethanol gunked up. I pulled the connector to engine off the line and saw it. I proceeded to cut the line back to were there was no more sediment and it has been fine. Must have built up over time.
     
  8. vernh59

    vernh59 New Member

    219
    Oct 21, 2008
    Mobile, Al
    355 AC
    165 Crusader
    Mine did the same thing. I cleaned the carb and it still did it. According to the Mercury manual you "never use a wire to clean the jets." Well, I finally took it to a mechanic who used a wire to clean the jets and it ran perfectly.
     
  9. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Yup - get the carb cleaned.
     
  10. Pirate Lady

    Pirate Lady Active Member

    664
    Jun 2, 2020
    None
    None
    Ducking as i prepare to get pummeled, but my new Coleman outboard, everybody including the outboard mechanic at my marina and the service manual say the ethanol will kill these motors. EVERY time i use the dingy, at the end of the day, i shut off the fuel valve and run it till all the fuel is out of the carb and it dies from lack of fuel. every.single.time. Told by many this will prevent issues down the road.
     
    Doc O Rock likes this.
  11. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    Let the pummeling commence!!!!

    Naw, but I will add a few asterisks:

    *killing the motor is a little dramatic, but cause grief? for sure.

    *running ethanol out before storage helps, but a better idea is to not use it in the first place.
     
    HawkX66 and techmitch like this.
  12. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Just remember, if it's a 2 stroke, every time you do that, you are starving the engine of lube.
     
  13. Pirate Lady

    Pirate Lady Active Member

    664
    Jun 2, 2020
    None
    None
    Mine is 4-stroke, you are right on 2 stroke though. we cant avoid ethanol, in Maryland it is at every gas station, none exempt.
     
  14. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Seeing e10 has been here since 1990 and most have adapted well, I concur what the many have told you. Fear not.
     
  15. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    That's probably for on-road vehicles? Have you done a search for recreational fuel?

    In the Great Lakes we can easily find e-free fuel at marinas.

    I just bought a new power washer for the house that came with a label forbidding even e10. There's a gas station not too far away that offers Rec90. It's double the price of mid-grade, but if the carb is happier with that than all my other small motors have been with e10, I'm good.
     
  16. superwa

    superwa Active Member

    327
    Jul 27, 2013
    Rhode Island
    2001 Sea Ray Sundancer 380
    Mercruiser horizon 8.1S
    Good to throw some seafoam in the tank regularly, and in the oil one as well for 4 stroke ones
     
  17. Doc O Rock

    Doc O Rock Active Member

    343
    Mar 23, 2016
    Lake St Clair, Belle Maer Harbor
    1999 380 Sundancer
    twin 7.4 Merc
    This is what my service tech for the outboard told me also. After I started I have 3 years of care-free one pull starting.
     
  18. blaster

    blaster Well-Known Member SILVER Sponsor

    May 23, 2011
    potomac river
    2010 sea ray 205 sport
    F-250 CCLB 6.2 4x4 3.73 rear.
    Mercruiser 4.3 mpi alpha 1.62
    The problem with every new small engine is that they are tuned for emissions rather than reliability. Lawnmower, snowblower, string trimmer, outboard motor, all of them run too lean out of the box.

    often there will be some tiny speck in the fuel system somewhere right out of the box and that is all it takes.

    I’m so sick of the extent environmental regulation goes for marginally better emissions at the expense of proper operation.
     
  19. bobeast

    bobeast Dance the Tide SILVER Sponsor

    Oct 22, 2017
    Isleton, CA
    2002 310DA
    350 MPI w/V-drives
    +1 on always running it dry before storage. I do this with all my small engines; weed trimmer, chain saw, lawn mower, etc. Having to run with partial choke is a sure sign of a gummed up carb.
     
    Jimmy Buoy likes this.

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