Official 2003.5-2008 340 Sundancer Thread

Discussion in 'Sport Cruisers' started by Zorba, May 17, 2013.

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  1. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    I just ordered the ngk spark plugs! Hopefully they work well
     
  2. M Prod

    M Prod Well-Known Member

    886
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    I just put in a set last week. All seems well so far. The old spark plugs looked like they had seen better days for sure. Make sure you gap them to .06

    Post a pic of the old if you can. Here’s mine:

    C2727425-3822-4E3A-9C8A-EC6AA03B88C9.jpeg
     
  3. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    Yes I saw that on motor cover thank you. (Gap)
     
    M Prod likes this.
  4. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    1988 Proline Center Console - 90hp Mariner/Mercury
    1969 Boston Whaler
    Twin 8.1 V-drives
    FYI, They should be gapped from the factory. Today's plugs with high tech materials generally are not recommended to be gapped because the metals are not as maleable and subject to fracturing the precision tip.

    -Kevin
     
  5. M Prod

    M Prod Well-Known Member

    886
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    They weren’t though. They were .03-.04 out of the box. 8.1 specifically needs the gap at .06. Other engines that use these size plugs will have different requirements. I had no issues with the gapping ..just careful.
     
    Windjammer likes this.
  6. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    I wonder what motor they come pre gapped for. I got them on amazon for 54$ for 8 of them
     
  7. M Prod

    M Prod Well-Known Member

    886
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Who knows? Manufacturers will say what they need to in order to protect themselves. That way it’s on the buyer and not them if a plug gets damaged while being gapped. Despite what the manufacturer will tell you, plugs have to be gapped per engine spec.
     
  8. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    1988 Proline Center Console - 90hp Mariner/Mercury
    1969 Boston Whaler
    Twin 8.1 V-drives
    The last few automobile engines I replaced plugs on they all came pre-gapped and in spec. With the iridium tips they caution about breaking it as it is brittle and will change the spark. You should check the gap to make sure it is proper but definitely stay away from the old school coin gap tool and only slide in a feeler gauge gently. If an adjustment is needed then you should only touch the ground anode from the outside.

    The "don't gap the plug" is based on the mfr's recommendations: https://www.ngk.com.au/technical_info/electrode-gap-adjustment/

    -Kevin
     
  9. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    So can u buy them gapped to the spec u are looking for?
     
  10. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    1988 Proline Center Console - 90hp Mariner/Mercury
    1969 Boston Whaler
    Twin 8.1 V-drives
    When I did my Suburban and Minivan I ordered the plugs the AC Delcos were pre-gapped. I did verify them but they did not need adjustment. I have been debating doing plugs on the 340SDA but everything seem to be running well so I am following the saying if if ain't broke don't fix it. But I am on my third season so it's probably just a matter of time. These 8.1s are known for eating plugs.

    -Kevin
     
  11. Chris Crownover

    Chris Crownover Member

    46
    Apr 22, 2019
    Seattle, Washington (Lake Union)
    Searay 340 Sundancer
    Mercruiser Sterndrives 740 hp
    Kohler 5ECD
  12. M Prod

    M Prod Well-Known Member

    886
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Exactly. And any reputable marine mechanic will tell you that’s bs and to gap your plugs. Bottom line is the plugs need to be gapped to engine spec. If the manufacturer doesn’t send you plugs gapped to that (and in my boating experience, they never are) then they need to be gapped.
     
  13. Korkie

    Korkie Active Member SILVER Sponsor

    474
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    So sounds like the GAP for the 8.1 / 496s need to be @ .06. Mine have been @ .06 each time I have changed them. Guess if they don't measure .06 outta the box, need to make them .06. Just need to do so without touching the positive element. Sounds reasonable.
     
  14. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    Keg I been running the same set of delco’s for three seasons now also, I’m excited to give the ngk’s a try
     
  15. Chris Crownover

    Chris Crownover Member

    46
    Apr 22, 2019
    Seattle, Washington (Lake Union)
    Searay 340 Sundancer
    Mercruiser Sterndrives 740 hp
    Kohler 5ECD
    Yeah there pretty pricey too :/
     
    Jon Paul likes this.
  16. Chris Crownover

    Chris Crownover Member

    46
    Apr 22, 2019
    Seattle, Washington (Lake Union)
    Searay 340 Sundancer
    Mercruiser Sterndrives 740 hp
    Kohler 5ECD
    Hey Guys, im working on my Kohler 5ECD generator again..and trying to replace the fuel injector, it says MotoTron SENSTMAP001A01 on it.

    Has anyone located one of these, I can't find anything online.
    hH9+S5ZXQJK1tCr79egBJQ.jpg xP9%Pw4RTumZptKpl6qCPg.jpg
     
  17. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    I use a local company for the generator.
    Mts power systems (631)240-0084
     
  18. England333

    England333 New Member

    17
    May 9, 2019
    Baltimore, Md
    340 Sundancer 2007. Garmin 942xs
    8.1 Mercruisers
    saopm! Omg. I just read your post today after giving up on the forum a couple of weeks ago. Just last week I was fixing the couch that had come off it’s runner, the drawer just happened to be open and I happened to glimpse to through the crack. If the light hadn’t have been just right I would never had seen it. Anyway, found it! I switched the bypass and input wires wires that hook up the cd changer ... and the satellite came on. I called Sirius and they added service. Thanks to everyone for your suggestions and help!
     
    strange weather likes this.
  19. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    1988 Proline Center Console - 90hp Mariner/Mercury
    1969 Boston Whaler
    Twin 8.1 V-drives
    Gotta luv easy fixes :)

    -Kevin
     
  20. liv2ryde100

    liv2ryde100 Active Member

    449
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    Lol crazy
     

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