removing spark plugs from a 130HP sea-doo engine 4tec rotax

This process will be the same on all Sea-Doo jetskis from 130 and up to 260HP Rotax engines. If you look after your Jet ski it will look after you. This means doing some basic preventative maintenance every 12 months.

The Sea-doo 4Tec Rotax engine is a very robust and powerful motor. To keep it in peak performance you will need to replace the spark plugs every year.

Tools Needed

Procedure for Sea-doo GTI 130 spark plug change

Sea-doo GTI 130 HP spark plug and coils

I like to replace the spark plugs on my GTI 130 every time I winterize it. So this means I take them out and put new ones in during my yearly maintenance. The plugs you require are NGK SPARK PLUGS DCPR8E / 4339.

You will need a long socket extension as these spark plugs are deep down in the engine block. 5 inches and above will work well. The longer the better.

3/8 socket extension for removing spark plugs from Sea-Doo Rotax 4Tec engine
  1. Disconnect the spark plug ignition coil connectors.
  2. Remove the ignition coils by twisting and pulling them up. They will be a little stiff.
  3. Use a can to squeeze compressed air into the spark plug housing to blow out any old dirt, oil, or water.
  4. Use a 13/16 spark plug socket to remove the plugs. Turning anticlockwise will remove them. If they haven’t been removed in a while they may be rusted in tight.
  5. Lift the spark plugs using one of the ignition coils. Just press the coil over the spark plug to lift them out. It’s a nice mechanics tip I picked up.
Use coil to remove spark plug deep down tip sea doo gti 130 spark plug change

6. Use XPS to spray a small squirt into the cylinder block. This will coat the cylinder to prevent rust on the bore if winterizing it.

7. Leave the plugs out and crank over the engine. This will lube up the piston rings as well. Use a rag over the plug holes to capture any excess lube.

8. Use some never seize compound on the spark plug threads to make removal easy next time. Now is a good time to unscrew the top tip of the spark plug and discard it.

Remove spark plug tip with pliers

9. Reinsert the new spark plugs making sure that the spark plug gap is set to 0.03 inches. I have yet to find one out of specifications but bet to be careful.

10. Hand tighten your spark plugs to make sure you don’t cross-thread any of them. Then use a socket wrench to tighten an extra 1/4 to 1/2 turn. The instructions on the spark plug packaging will explain how much to tighten. For me, these plugs were 1/2 turn after hand tight.

11. Clean all the old Down Corning 111 waterproof paste off the ignition coils and apply a nice new gob of paste just underneath and above the plug connectors terminals.

Use MOLYKOTE (DOW CORNING) 111 on the sea-doo coil for water protection and easy removal

12. Slide the black rubber disk back up to the top and apply more Molykote (DOW CORNING) 111 to the rubber seal.

Put MOLYKOTE (DOW CORNING) 111 here on this sea-doo coil

13. Insert the ignition coils and line up the connection points and plug them in. Smooth over any excess Down Corning 111 paste.

Congratulations you have just replaced your spark plugs on your Sea-Doo 130HP Jet-Ski. Other more high-performance models will have an engine cover that will have to be removed first.

Sea-Doo GTI 130 Rotax engine with spark plugs installed

Below is a great video that explains in great detail how to remove the spark plugs on Sea-Doo 4Tec. Skip to the 3.40-minute mark. Thankyou 3ftDeep.

Full Sea-doo spark plug chart

YearPWC
MODEL
NGK
STANDARD
PLUG
NGK
IRIDIUM IX
PLUG
GAP
Sea-DooMODELSTDIRGAP
 2014-17SPARK
ACE 900
CR8EB0.035
 2016-17RXP-X 300
RXT-X 300
GTX LTD 300
KR9C-G
Comes with an oil filter.
0.035
 2007-15
2013-15
2007-15
2007-15
2007-15
2002-07
GTI 4-TEC
(ALL)
GTR
RXP-X,RXT-X(ALL)
GTX 4-TEC
WAKE 4-TEC(ALL)
GTX 4-TEC
(ALL)
DCPR8E0.028
1997-99
1999-02
2000-02
2001-02
1999-02
1996-00
1996-00
2004
1999-02
1997-99
1995-00
1997-01
1997-01
1996-03
1993-97
GSX LTD
GTX
RX
RX-X
XP
GSX
GTX
GTI
GTX RFI
SPX
XP
GS
GTS
GTI
HX,SP,SPX,
GTX, XP
BR8ESBR8EIX0.022
 
610CC,
650CC & 780CC
610CC,
650CC & 780CC
BR8ES 0.045 
2000-03
2002-03
2004
2004
2007
GTX DI
LRV DI
RX DI
XP DI
3D 947 DI
ZFR4F-110.035
1990-96SP, GT, GTS,
GTX, SPi, SPX, XP
BR7ESBR7EIX0.022

How many spark plugs in a Sea-doo?

All Sea-Doo Jet skis have three spark plugs. You must change all three if doing a spark plug replacement.

They tend to rust in over time so change them out every year. It is a small cost to pay for peace of mind.

How often should you change Jet Ski spark plugs?

You should change the spark plug in a Jet Ski every year or 25 hours whichever comes first. These are cheap consumable items that will fail and rust if you don’t change them out regularly.

Problems you may encounter.

Stuck Spark Plug

If the spark plugs have not been removed for a while they may be rusted in position. Try warming up the engine first and then try to remove the plugs. If they are still stuck you will have to use a breaker bar.

Sometimes in extreme circumstances, the spark plug will break or snap. You will have to then use an easy out to remove the plug. Always check for any metal on top of the piston if you break a spark plug.

Tip: Never over-tighten spark plugs otherwise you will have issues removing them on the next service.

Oil in the Spark plug hole.

oil in spark plug hole sea-doo

Sometimes when working on other Jetskis I have found oil in the spark plug hole covering the spark plug. Usually, this comes from a failed rocker cover gasket and it is leaking engine oil into the spark plug area.

If it is only a small amount it is not a big deal. But if it is allowed to cover the ceramic part of the spark plug you can get a misfire on that cylinder. This is because the spark tracks into the engine oil.

You will need a new rocker cover gasket to fix. Otherwise, just drain the oil from the spark plug area after every few rides. A can of air and a rag works great.

Ignition coil hard to remove

If you don’t use Dow corning 111 Molykote 111 Compound the ignition coils can be hard to remove. Make sure to use this as it will also stop water and dirt from getting into the spark plug area.

If you find that the ignition coil is swelling up this means there is corrosion or failure of the coil and it will need to be replaced.

Conclusion

DCPR8E 4339 spark plug sea-doo gti 130

If you have everything ready to go the Seadoo GTI 130 spark plug change removal process should only take 1/2 hour. The cost of plugs are cheap so I buy 9 at a time to get me through a few seasons. The plugs I use are DCPR8E 4339.

Doing this service job yourself will save you a heap of money and it is very easy to do. Once you complete it why not do the oil service change on your Sea-Doo at the same time.

Now get out on the water and have some fun. Maybe we will cross paths one day.

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