Replacing spark plugs.. what should I get?

[jaywoodz]

I've troubleshooting a problem with my starboard engine, and I'm going to start with the plugs.. and maybe even the wires. What is recommended to put in my motors? I have 350 MAG MPI Horizon motors, 2006-2007 models, fuel injected.

 

[Air O'Nautical]

Go here and find your motor and see...
//www.mercruiserparts.com/selectModels3.asp?type_id=8I

 

[Air O'Nautical]

Oops,www.mercruiserparts.com
Better.

 

[surfinjoe]

I would go with Iridium plugs per the Mercruiser TSB.

 

[Quint4]

Merc recommends AC 41-993 for your motor.

 

[chpsk8]

I have the same question for my 1990 with twin merc 260s. I keep seeing conflicting info and I read a tsb somewhere that made me even more confused. Any help would be great, I would like to do a full plugs wires and cap and rotor. Thanks in advance

 

[jaywoodz]

Merc recommends AC 41-993 for your motor.

I ordered the ones listed on the Merc site. They were recommended by Merc in their parts selector, so I got 8 of those. NGK, I believe.

 

[Quint4]

I was referencing Merc service Bulletin 2006-03 regarding the plugs.

 

[chpsk8]

Roger that, thank you.

http://ww2.justanswer.com/uploads/ROCKETBOAT/2008-12-09_042519_SPARK.pdf

 

[l-skynyrd]

Just to add.....I have the 5.7 MPI's and use the AC 41-993 plugs with no problems. If you want to save some money (about 1/2) buy them thru Summit Racing online. Len