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Thread: Raptor 400 Spark Plug Tune-up
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09-04-2018, 08:30 PM #1Senior Member
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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.
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2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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09-04-2018, 08:34 PM #2Senior Member
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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).jpgLast 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
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10-14-2018, 09:21 PM #3Member
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Hi,
Do you know the torque spec for re-installing the spark plugs?
Thanks in advance2016 Moomba Craz
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10-14-2018, 09:26 PM #4Senior Member
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http://www.instgram.com/jlyons30
2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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10-14-2018, 09:42 PM #5
Raptor 400 Spark Plug Tune-up
Typical torque spec for spark plugs is 18 ft-lbs.
Sent from my iPhone using Tapatalk2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan
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10-14-2018, 10:05 PM #6
Don’t over torque a spark plug in an aluminum head.
Sent from my iPhone using Tapatalk2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan
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05-20-2019, 01:45 PM #7
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 Tapatalk2016 Mojo surf edition
1100lbs rear w/ 475lbs piggyback mid/ center 700lbs/ 500lbs IBS/ 600 lbs lead
ACME 2315
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05-20-2019, 02:32 PM #8Senior Member
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This is all I have.
https://photos.app.goo.gl/1xaFHurNf8443YDx8http://www.instgram.com/jlyons30
2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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05-20-2019, 04:24 PM #9
That link worked, thanks!
Sent from my SM-G950U using Tapatalk2016 Mojo surf edition
1100lbs rear w/ 475lbs piggyback mid/ center 700lbs/ 500lbs IBS/ 600 lbs lead
ACME 2315
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09-29-2019, 11:36 AM #10
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?
2024 Supra SV 400 “SUPA DUPA”
2019 Moomba Max - sold"MOOMBAE"
2016 Yamaha AR192 - sold