87 268 da

Discussion in 'Sport Cruisers' started by Jabfd32, Jul 26, 2018.

  1. Jabfd32

    Jabfd32 New Member

    12
    Jun 10, 2018
    1987 sea ray 268 da 2003 Suburban 2500
    2007 5.7L mercruiser 250 hp alpha 1 gen 1
    hello everyone trying to find out why my new boat is a dog.
    I have a 2007 5.7L 250 hp with the boat empty no gear/water on board at all half a tank of fuel I was able to reach 4300 rpm and get up to 23 knots now with fuel tank f fuel and about 25 gallons of water I can barley make 3800rpm and 15 knots. When the boat was empty the best cruise speed was around 3800 rpm and 20 knots I had trim tabs down. Now should go down a pitch to get in the rpm range of 4200 to 4600 with the added gear and fuel?
     
  2. dvx216

    dvx216 Well-Known Member SILVER Sponsor

    Feb 1, 2012
    orrville,ohio
    2000 310 sundancer 5.7 vdrives






















    n/a
    twin 5.7 300 Hp. V drives
    Take a look at your prop could have got changed out for the wrong pitch for starters. If that checks out you need to take a look at your fuel system it could be as simple as a plugged fuel filter. Clean the spark arrestor. A standard tune up cap rotor,wires and plugs take a good look at the plugs they should all look the same. Because this is a new to you boat it's hard to say what your problem is without eliminating the normal maintenance that needs done .
     
    Bugsy22 likes this.
  3. Jabfd32

    Jabfd32 New Member

    12
    Jun 10, 2018
    1987 sea ray 268 da 2003 Suburban 2500
    2007 5.7L mercruiser 250 hp alpha 1 gen 1
    Do you know what the correct prop pitch is ? I will look at the possible fuel issue as well thank for your response
     
  4. boatman37

    boatman37 Well-Known Member

    Jun 6, 2015
    pittsburgh
    2006 Crownline 250CR
    Previous: 1986 Sea Ray 250 Sundancer
    5.7 Merc
    I know your boat is a little bigger and heavier than mine was but i had a 14.5x17 then switched to a 15.8x15. the 2nd one was much better
     
  5. Bugsy22

    Bugsy22 Member

    37
    Jun 2, 2016
    1000 islands region New York
    00' 310 Dancer w/ 5.7 EFIs and Bravo 3s. Recently purchased after having a 90' 270 Dancer for sever
    5.7 EFIs w/ Bravo 3s
    The fix for a Heavy underpowered boat is a 4 blade stainless prop. I went through it with my 90' 270DA. A world of difference! If you can swing the $ of a bravo 1 4 blade do it! Solas makes a nice prop too! Just remember a general rule of thumb is come down 1" of pitch when going from a 3 blade to a 4 blade.
    I have a stainless Solas rubex 14.75 x 15 in the box if your interested. Was on my 270 for 1 day, got wet and couldn't return it. $225 shipped
     
  6. 230weekenderUSC

    230weekenderUSC Member

    83
    Sep 6, 2013
    Mission Bay, San Diego
    1988 230 weekender
    5.0 Mercruiser EFI with Alpha 1

    What outdrive is it for?
     
  7. Bugsy22

    Bugsy22 Member

    37
    Jun 2, 2016
    1000 islands region New York
    00' 310 Dancer w/ 5.7 EFIs and Bravo 3s. Recently purchased after having a 90' 270 Dancer for sever
    5.7 EFIs w/ Bravo 3s
  8. Jabfd32

    Jabfd32 New Member

    12
    Jun 10, 2018
    1987 sea ray 268 da 2003 Suburban 2500
    2007 5.7L mercruiser 250 hp alpha 1 gen 1
    He all

    So I took the boat out today and the boats new name is 8 knots. I could not get it to go over 3000 rpm with out it making some kind of rattles or pinging also I tried to rev thru it but after the boat was almost dieing or loss power. When I drop the throttle back down all runs well. Could it be pinging and could that be from clogged fuel filter. Iam going to change it tomorrow.
     
  9. Jabfd32

    Jabfd32 New Member

    12
    Jun 10, 2018
    1987 sea ray 268 da 2003 Suburban 2500
    2007 5.7L mercruiser 250 hp alpha 1 gen 1
    .
    It sounds like this
     

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