IntelBoater
Recruit
- Joined
- Aug 5, 2012
- Messages
- 3
I purchased a 1997 Bayliner 1954 with the Mercruiser Alpha One 3.0 LX. On the top of the flame arrestor it has the AC-MR42LTS spark plugs gapped at .035. The individual who i purchased from had Champion RVI5YC4 plugs and its been idling very rough. So i figured lets just swap out the plugs.
Looking online, i found that the AC-MR42LTS plugs are no longer able to be purchased. I found the following thread but had my doubts about the plugs being recommended as an alternative (http://forums.iboats.com/showthread.php?t=549396)
With some more research i ended up getting NGK #BPR6EFS. Today i put them in and started up the boat and had nothing but issues. When i did get it running for a bit, it ran VERY rough. I decided to check out the plugs and when i took out one of the plugs nothing but smoke came out of the hole. My guess is that cylinder wasn't even firing as the end of the spark plug looked new as heck. I replaced that plug with another of same since i bought extras, attempted to start again this time it would only turn over for a short time then always die.
I decided for the hell of it, lets put the old plugs in. So i put the old plugs in and it started up after 3rd time with no issues. Idled a little hard again but at least stayed running.
So my question is, what plugs are an alternative to the AC-MR42LTS? Should i get the MR43LTS? I understand since i have the LX model of engine i need to get the longer reach ones since my head is longer. If i research right, the current champions the previous owner put in, RVI5YC4, are not even the longer type nor marine. Plus i've heard nothing bad about the champions with blow out issues.
Are there any mechanics that know which plug i should be using? Let me know if you need more information. Hoping this thread can finally solve the debate as it looks like I'm not the only one with the question. Thanks everyone!
Looking online, i found that the AC-MR42LTS plugs are no longer able to be purchased. I found the following thread but had my doubts about the plugs being recommended as an alternative (http://forums.iboats.com/showthread.php?t=549396)
With some more research i ended up getting NGK #BPR6EFS. Today i put them in and started up the boat and had nothing but issues. When i did get it running for a bit, it ran VERY rough. I decided to check out the plugs and when i took out one of the plugs nothing but smoke came out of the hole. My guess is that cylinder wasn't even firing as the end of the spark plug looked new as heck. I replaced that plug with another of same since i bought extras, attempted to start again this time it would only turn over for a short time then always die.
I decided for the hell of it, lets put the old plugs in. So i put the old plugs in and it started up after 3rd time with no issues. Idled a little hard again but at least stayed running.
So my question is, what plugs are an alternative to the AC-MR42LTS? Should i get the MR43LTS? I understand since i have the LX model of engine i need to get the longer reach ones since my head is longer. If i research right, the current champions the previous owner put in, RVI5YC4, are not even the longer type nor marine. Plus i've heard nothing bad about the champions with blow out issues.
Are there any mechanics that know which plug i should be using? Let me know if you need more information. Hoping this thread can finally solve the debate as it looks like I'm not the only one with the question. Thanks everyone!