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2000 Carver 406 7.4 MPI Spark Plugs

GAS engine, transmission and generator repair and maintenance discussion forum.
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Topic author United States of America
crquisto
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Posts: 46
Joined: September 17th, 2014, 12:50 pm
Vessel Info: 2000 Carver 406 Aft Cabin, twin 7.4 gas Mercruisers - Flyboy II
Location: Possum Town, TN
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2000 Carver 406 7.4 MPI Spark Plugs

Postby crquisto » April 25th, 2016, 3:18 pm

I can't see placards on my engines and couldn't get an answer from my books, so I'll just ask here: Does anyone know what spark plugs are specified for the Mercruiser 7.4 MPI engines on my 406. They are probably 1999 engines instead of 2000.
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SplashyLady
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Vessel Info: Carver 3227 Sedan Convertible
1986 - 260 Mercruisers - Kohler 5E
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Re: 2000 Carver 406 7.4 MPI Spark Plugs

Postby SplashyLady » April 25th, 2016, 3:56 pm

1999 huh? The 7.4 engines of this vintage are in a "donut hole" with a generation change right in the middle. :banghead:

Seloc and Mercury would likely list AC MR43LTS, Champion RV12YC, or NGK BPR6EFS

But check what comes out :-O - some 7.4 engines around 2000 changed to CHAMPION RS12YC or NGK BPR6FS plugs.

The RS12YC and BPR6FS have a reach of .708 - RV12YC and NGK BPR6EFS plugs have a reach of .406

Should be a plate on the side of the engine with the plug spec - and you can always put in what came out - assuming she was running... :-D I am an NGK fan myself, but some folks love Champion. :usa:
Captain John
Past Commodore, Peninsula Yacht Club
Lake Norman, NC
Carver 3227 - "Splashy Lady"
Aquasport 222CCP - "Gone Fission"
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Topic author United States of America
crquisto
Scurvy Dog
Scurvy Dog
Posts: 46
Joined: September 17th, 2014, 12:50 pm
Vessel Info: 2000 Carver 406 Aft Cabin, twin 7.4 gas Mercruisers - Flyboy II
Location: Possum Town, TN
Has thanked: 2 times
Been thanked: 1 time

Re: 2000 Carver 406 7.4 MPI Spark Plugs

Postby crquisto » April 25th, 2016, 5:35 pm

Thanks Splashy Lady. I'll check all you suggested. Thought the placard would be on the top cover or front - didn't look too closely at the sides of the engines. I'll try again and, failing that, will just go with what was there since they've been running well.
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