Minnesota Classic Glastron Forum
General Category => General Discussion => Topic started by: Kunzelman23 on September 16, 2018, 09:21:55 AM
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Recently purchased 71 glastron, aero marine 350. What spark plugs would be best?
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Welcome to the forum Kunzelman23 !
Berkeley Jet & Hardin Manuals
http://forum.cgoamn.com/index.php?topic=2916.0 (http://forum.cgoamn.com/index.php?topic=2916.0)
The Hardin manual lists 350 spec's.
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Good question... I would like to know also what everyone uses, especially in this modern word of power. How about brands... champ., ac, ngk, the list is long.. electrodes? Split, rings, flat, diamond, Just as an example.. my 86 100 hp Johnson says to use champ. L77j4. What would a “better” modern plug could I use?
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Come on guys.... I can’t believe nobody has an option on spark plugs.?.?. :o
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If I had one choice I'd say NGK, Bosch are good as well. AC's are more readily available and cheaper, but don't last as long. I developed a disliking of Champion plugs in the 70's, could put a fresh set in the Camaro, and by 1500 miles it would develop a miss. Of course these were the pre-electronic ignition days, that might be part of the issue. I like center gap plugs for 2-strokes. All the plug hype with multi electrodes and such might make a difference with high performance applications, but I've never seen a difference in most cases. I've been running ngk iridium's in the CVZ with good results. More important is to purchase a quality plug, and don't be afraid to take a look at them every now and then. The plugs tell a story about what's going on inside the combustion chamber, listen to what they tell you. Plenty of guides out there, find a good one, print it, hang it on your shop wall. Good luck.
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Only plug I've ever had issues with is Champion. I always try and use NGK and never had a problem with them. I always thought the plugs with multi-electrodes were more of a sales pitch than anything. Going with platinum or iridium seems to help with plug life. Most plugs in cars last over 100,000 miles. We'll never see that kind of use in our boats.
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NGK surface gap plugs for my 1989 Mariner 115 HP outboard.
Dave did some plug testing on his V4 Johnson ..
http://forum.cgoamn.com/index.php?topic=3084.220 (http://forum.cgoamn.com/index.php?topic=3084.220)
Do a search on forum for "Spark plugs" there's a few threads.
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I'd go with AC's if it's a GM motor. I've got 15+ seasons on the AC MR 43T plugs in one of my boats with a 350 GM engine.
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Pretty much any thing but champion. I have put in many bad champion plugs right out of the box.
I run NGK on all my sleds, 4-wheelers, etc.
Run AC in the boat