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Spark Plug Question - 2002 Mercruiser 4.3L (carb)

I need advice on spark plugs. I decided to give the Mercruiser a minor tune-up (plugs, rotor, cap, gas filter). I removed the OEM plugs, which are AC 41-932. Interesting find, given the plug number on the flame arrestor is AC MR43LTS. To make things even more interesting, I go down to my local boat shop and request six AC 41-932. The parts guy tells me that the number means nothing to him and that he needs the serial number. The engine serial number is OM642767. He is still confused and can't find me my AC 41-932's. Further to more reading on the Internet, I notice that the AC 41-932's exist (most online boat shops offer them). Although, the description claims it's for 2001 and newer engines that are equipped with MPI (4.3, 5.0, 5.7, 6.2). I compared the 2 different plugs and the electrode on the 41-932 is much smaller in diameter than the 43LTS'. The 41-932 is labeled as a platinum plug, and claims to last 100,000miles.

Here are my questions: Which plugs should I install? Is the 41-932 a colder plug, which helps minimize dieseling (run-on)? Since I fog my engine each fall (winter storate), shouldn't I run plain plugs (instead of platinum) and change more frequent?

Thanks in advance,

F499

 f499
May 11
Platinum or regular is a personal preference thing. I use regular plugs myself.

Run-on is a bad sign and often has nothing to do with the plugs. Often it is the result of hots spots created by detonation or carbon build up. If you have persistent run-on I recomend running a higher grade of gas as the first thing to try.

 jamesgangnc
May 11
The plugs you pulled are not for your engine. The 2003 Quicksilver product guide calls for NGK BPR6EFS. Gapped at .045 Cross reference to AC or Champion If you don't like NGK. Jim

"f499" <jean@famillemenard.com> wrote in message

Jim
May 11
   
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