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  1. #1
    Join Date
    Aug 2011
    Posts
    2,344

    Default Raptor 400 Spark Plug Tune-up

    Spark Plugs:
    Motorcraft SP-526 (16 total)

    Remove the Engine cover and side panels.

    1. Remove the two bolts for the fuse box and move the fuse box to the center.
    2. Remove the spark plug assembly bolts, one per spark plug on the top.
    3. Disconnect the spark plus assembly buy pressing on the clip and remove, don't pull on the wires.

    Screenshot_20180904-165412_Photos.jpg

    Remove the EGR hose, pull outwards.

    Screenshot_20180904-165625_Photos.jpg

    Remove the spark plug assembly, pull straight up, then remove the spark plugs and install new.

    Screenshot_20180904-165825_Photos.jpg

    1. Remove the bolts for the ECU/computer, you can gently move this to the center of the engine.
    2. This spark plug is partially blocked by the fuel line, disconnect the connector and lower plug wire by pulling on the cap.
    3. By moving the fuel line to the side you can remove the spark plug assembly.

    Screenshot_20180904-165526_Photos.jpg

    Remove the ECU/Computer mounting plate, 2 alen bolts and one bolt. No need to cut the zip ties just swing the plate out of way towards the outside.


    Screenshot_20180904-165710_Photos.jpg

    Remove the spark plugs bolts and assemblies and replace plugs.

    Reverse steps to reinstall everything, push the spark plug assemblies into the hole and seat on the spark plug, then rotate to line up.
    Last edited by parrothd; 09-04-2018 at 08:39 PM.
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  2. #2
    Join Date
    Aug 2011
    Posts
    2,344

    Default

    Upper spark plus assembly

    20180901_145024.jpg


    Replace the lower spark Plugs 8 plugs as normal

    20180901_145031.jpg

    If you have these metal spark heat shields on the lower wires, they should be removed per indmar, use pliers to pull the rubber insert to remove, don't plug the wire. They slide off.

    20180901_155024 (1).jpg
    Last edited by parrothd; 09-04-2018 at 08:45 PM.
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  3. #3
    Join Date
    May 2018
    Location
    Michigan
    Posts
    56

    Default

    Hi,

    Do you know the torque spec for re-installing the spark plugs?

    Thanks in advance
    2016 Moomba Craz

  4. #4
    Join Date
    Aug 2011
    Posts
    2,344

    Default

    Quote Originally Posted by moparsigfan View Post
    Hi,

    Do you know the torque spec for re-installing the spark plugs?

    Thanks in advance
    Nope.. I go with the feel..
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  5. #5
    Join Date
    May 2018
    Posts
    1,360

    Default Raptor 400 Spark Plug Tune-up

    Typical torque spec for spark plugs is 18 ft-lbs.


    Sent from my iPhone using Tapatalk
    2018 Supra SA 400
    Michigan

  6. #6
    Join Date
    May 2018
    Posts
    1,360

    Default

    Donít over torque a spark plug in an aluminum head.


    Sent from my iPhone using Tapatalk
    2018 Supra SA 400
    Michigan

  7. #7

    Default

    I can't get OPs photos to open, tried tapatalk and desktop, is it just me or are the photos gone?

    Sent from my SM-G950U using Tapatalk
    2016 Mojo surf edition
    1100lbs rear w/ 475lbs piggyback mid/ center 700lbs/ 500lbs IBS/ 600 lbs lead
    ACME 2315

  8. #8
    Join Date
    Aug 2011
    Posts
    2,344

    Default

    Quote Originally Posted by schwan View Post
    I can't get OPs photos to open, tried tapatalk and desktop, is it just me or are the photos gone?

    Sent from my SM-G950U using Tapatalk
    This is all I have.

    https://photos.app.goo.gl/1xaFHurNf8443YDx8
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  9. #9

    Default

    That link worked, thanks!

    Sent from my SM-G950U using Tapatalk
    2016 Mojo surf edition
    1100lbs rear w/ 475lbs piggyback mid/ center 700lbs/ 500lbs IBS/ 600 lbs lead
    ACME 2315

  10. #10
    Join Date
    Feb 2018
    Location
    Central Bama
    Posts
    467

    Default

    Are new plugs required each year? I looked in the Indmar owner's manual and it doesn't say to replace them each year or to even inspect. On my previous Yamaha boat it was very finicky on spark plugs and it did not run great unless you had near pristine/new plugs so each season we replaced them. Do I need to do the same with the Raptor?
    2019 Moomba Max
    2016 Yamaha AR192 - sold

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