Spark Plug Numbers

[Mr. Grumps]

2000 Mercruiser 4.3L EFI <br /><br />I have Merc's manual 25 but can't find <br />which spark plug number to use. I would<br />like to purchase them prior to taking boat out <br />of storage.<br /><br />Any recommendations on type/make would be helpful<br /><br />Thanks

 

[achris]

Re: Spark Plug Numbers

NGK BPR6EFS.

 

[Don S]

Re: Spark Plug Numbers

Look on page 1B-5, it's in the specs.

 

[Mr. Grumps]

Re: Spark Plug Numbers

Thanks for the info.<br /><br />Any preferences between NGK or Champion or<br />any other brand? Any performance issues?<br /><br />Your thoughts please!

 

[trog100]

Re: Spark Plug Numbers

he he he.. here comes an "oil" thread.. he he..<br /><br />trog100

 

[Bondo]

Re: Spark Plug Numbers

The AC MR43TS is the # for chevies Up to the intro of the Vortec Heads....<br />And, MR43LTS for the Vortec motors.......(which your's Should be)<br /><br />AC uses an Alloy plug body... It Doesn't Rust.....<br /><br />The NKGs noted by Chris is a Good Plug......<br /><br />Personally,.... I Avoid Champions like the Plague........

 

[cmyers_uk]

Re: Spark Plug Numbers

Bondo,<br /><br />What is it about Champions, When I ask my dealer for spark plugs thats what hes been giving me, I must admit to not having a problem but hey if their Cr*p I dont want em.. What gives?<br /><br />Cheers Chris

 

[Don S]

Re: Spark Plug Numbers

They are Crap, no doubt about it. I have replaced more champion plugs with NGK or Bosch plugs to cure missfiring cylinders than I care to think about. (on Marine Engines)

 

[Bondo]

Re: Spark Plug Numbers

I Guess it's a personal thing with Me.....<br />Anytime I've ever had sparkplug issues, it was with Champs........<br /><br />Nowadays I use,<br />ACs for GM motors.....<br />Motorcraft/Autolites in Fords......<br />NKGs in Jap Iron......<br />Bosch in Euro Iron.....<br /><br />And,.............. Champions in the Dumpster..................

 

[trog100]

Re: Spark Plug Numbers

"I Guess it's a personal thing with Me.....<br />Anytime I've ever had sparkplug issues, it was with Champs"<br /><br />could that just be cos there are far more of em in use than any other plug.. ????<br /><br />folks go by "names" some put more faith in em than others.. in todays age it can be a mistake cos the money makers know this.. <br /><br />i think NGK plugs probably cos they are/were japanese were better quality.. not sure if this still applies thow..<br /><br />i would guess that the folks who knock champion plugs would also knock bayliner boats.. ford cars and pretty much everything else that didnt come with a good "name"..<br /><br />all i know is it aint only garments that come with designer labels.. and the old adage "u get what u pay for" is total crap in this accountant run rip off age..<br /><br />yep.. defintely an "oil" thread.. he he <br /><br />trog100

 

[achris]

Re: Spark Plug Numbers

I have to agree with Don and Bondo on this one. Binned more champs because of problem plugs than all the rest put together.....<br /><br />Years ago Champion were a good plug, but like a lot of product at the top of the heap, didn't continue to improve their technology. Got left by the way-side by people willing to make a better product.<br /><br />IMHO.<br /><br />Chris...............

 

[cmyers_uk]

Re: Spark Plug Numbers

Trog, I know what your saying but Ive followed a number of these types of threads and once I start seeing enough people saying the same thing I tend to believe it. As Ive said Ive had no issues but why take the chance next time Ill opt for NGK. Then when I start a thread with my motors missing you will all know the plugs are fine

 

[rabidfish]

Re: Spark Plug Numbers

I still use Champions in the BRP outboards...<br />Otherwise everything gets NGK...<br /><br />I don't have any real facts or records to base it on, but everything sure does "seem" to be running better... I was hoping it's because I am a better mechanic than I used to be... now I know... it's the plugs!<br /><br />(or the shoes maybe???)

 

[marinemech1]

Re: Spark Plug Numbers

put in whatever plugs are recommended by the manufacturer <br />the wrong plugs can cause a slight annoyance or complete engine failure, but the world is full of people who know more about it than the guy who built it