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  1. #121
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    Quote Originally Posted by Chaz View Post
    2002 - 2005 were the only years the 300x were produced . Go to your local outboard boneyard and see how many of them are littered about ... Zero
    But there are usually same year 225 / 250's available for your choosing .
    Many of the base components are shared between the two . The ones that are not , can be modified , bought new or now better than new .

    For guys with running motors that want a little more , the best bang for the buck is to clip your heads to 64-65cc . Lighten the flywheel to aprox 13 pounds . Strip your reed blocks of the rubber coating , lap them flat and install the reed Chris Carson makes just for this.
    Easy external parts to get to . Still quiet as a church mouse and will usually pull one more pitch size prop to the same rpm .

    The 300x exhaust can has a "cats eye" hole on the side to help them idle a little cleaner as well as a hole at the base to vent some exhaust away from going thru the lower unit . I have cut the back off and left it off . I have cut the back off , made a few 2" holes and welded the whole thing back on . Each had a different level of sound .





    If you are going to cut the can off , leave the water dumps a little longer .



    Now that it's not so constipated ..
    You can't buy the X reed adapter plate from Merc any longer but these billet adapter plates and fuel rail's are available that will move the injectors , rail , harness , brackets , bridges and other junk out of the airstream ..





    It would be a good idea to put an adjustable fuel pressure regulator on the VST at this point if your mature enough to not run it lean . It will keep going faster the more you turn it left .. until it saws itself in half . The whole reason for putting it there is to keep the bottom two cylinders fat and happy ..

    There are two pretty common sense "stages" if you want to call them that . With moderate compression, it will still run on pump gas .
    Anything after that requires going into the block and doing port work big bore kits etc .

    E-85 ... Man , don't you know boaters will drive to the end's of the earth to find "wrek" fuel .. ? LOL ..
    The only thing I see wrong with it , is that it is "Hydroscopic" . The whole time the boat is in the water , near the water , or the humidity is high and the tank vent is not plugged , it would be absorbing water .

    So what thread are the fittings for the hp outlet. Getting ready to place an order for all my AN fittings and don't feel like taking my motor on the boat apart.

    I ASSume -6 is plenty

  2. #122
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    Yes sir , a # 6 O-ring x #6 male to a # 6 on the run gauge port adapter is what that is ..

  3. Likes RSWORDS liked this post
  4. #123
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    [QUOTE=Chaz;3164628]Yes sir , a # 6 O-ring x #6 male to a # 6 on the run gauge port adapter is what that is .. [/QUOT


    PM you Charlie

  5. #124
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    [QUOTE=torquespeed;3164679]
    Quote Originally Posted by Chaz View Post
    Yes sir , a # 6 O-ring x #6 male to a # 6 on the run gauge port adapter is what that is .. [/QUOT


    PM you Charlie
    E- Mailed ya this morning ( eastern standard time )

    Just now PM'd ya back ...

  6. #125
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    Quote Originally Posted by RSWORDS View Post

    I ASSume -6 is plenty
    That stock brass hose barb on the left and the feed port / transfer tube on the stock fuel rail are tiny ....


  7. #126
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    Quote Originally Posted by Chaz View Post
    That stock brass hose barb on the left and the feed port / transfer tube on the stock fuel rail are tiny ....

    Will a 2002 300 pro XS PCM work on my 2002 225 efi? I thought I read somewhere that they were different but just wanted to be sure.

  8. #127
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    Quote Originally Posted by torquespeed View Post
    no problems at all i can reflash your ecu or you can exchange a ecu $335usd freeee shipping back to you
    your get the reflash and a tidy up of your ecu if paint is chipped will repaint and a rebadge 300 performance fuel
    and a neat torquespeed decal.
    i put a bit of detail on gear presentation added.
    PM me or leond197@hotmail.com i will send you my address for sending the ecu and i use paypal as well.

    cheers Torquespeed
    Torquespeed, What does it run for the 2-box 1999 250efi?. $335 usd a box or $335 a pair ?.. What fuel are these set up for octane wise?.

  9. #128
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    Quote Originally Posted by big tom View Post
    Torquespeed, What does it run for the 2-box 1999 250efi?. $335 usd a box or $335 a pair ?.. What fuel are these set up for octane wise?.
    $670usd a pair , standard pump gas is fine we use a BP 98 in Australia premium fuel to get the best results , running a better set of cut heads around 130 to 140 comp will get you better results on the reflash and a lite flywheel.

  10. #129
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    Quote Originally Posted by Freedom92 View Post
    Will a 2002 300 pro XS PCM work on my 2002 225 efi? I thought I read somewhere that they were different but just wanted to be sure.

    1998-2000 300 Pro Max-dual ecu

    2001-2005 is 300X (2001 different coils not compatible with 2002-2005 ecu)-single Motorola ecu

    2006-current is 300xs- Single Motorola ecu

    Mercury never made a 300 "Pro XS" in a 2 stroke

    to answer your question a 300x 2002-2004 ecu will work on your motor in everyway but not with your pencil injectors. the 300x uses the pink tip khein like a laser injected 2.5L had

  11. #130
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    the 2002-2004 200/225/250efi motors are basically like Chaz said a downgraded 300x.

    The main difference internally is each horsepower has it's own port map.

    external bolt ons:
    -higher compression head
    -light flywheel
    -thicker reed plate with external pink tip injectors not the pencils
    -carbon 5 petal reeds instead of steel 6 petal
    -the throttle body is machined different inside the horn

  12. #131
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    Oh yeah!!! 300x block has a more open echaust chest cast into it unlike every other 3L including the 3.2L 300xs block

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