Where did you get them and where did you look? I always buy my Champion marine plugs at the autoparts store rather than the boat store. They are much cheaper. Availability is not 100% (but nearly so), so I always call ahead first and can almost always find what I need. I've used NAPA, Carquest and Schucks, so ymmv.
Actually in the factory service manual for my '70 25hp they say the plug type is J6V or NGK B8S...<br /><br /> the motor had B7S in it, and idled poorly. But since it was the wrong heat range, and one of the plug caps was falling off, I can't blame it on NGK. I intend to compare new J8S's to new J6C's and see how it likes 'em.
Of course I wasn't saying there was any difference in plugs between the boat shop and the autoparts store - just that the autoparts store probably has cheaper prices, and for me at least, is much, much more convenient (e.g a minute from my office vs. a 50 minute round trip across town). As for the problem you had, I have no idea. The only time I've ever had problems with a plug - whether they be NGK, autolite, champion or whatever is used in the various cylinders I have - is because I damaged it or put it in wrong. But I'm a ****ty mechanic and have that sort of problem with everything I try to "fix".Originally posted by Mid-size Johnson:<br /> When I got my Johnson, I put required Champion plugs in. I ran it once, one of the plug's ceramic came loose. Replaced that plug, ran motor again, started losing rpm's got back to dock, #2 plug had exploded and fried plug wire. Bought NGK's no problems since. Now I wonder, should I have purchased the plugs at a auto parts store? I bought them at Boater's World and paid a premium for them. Shouldn't all plugs be created equal?
Apparently, I only know how to install NGK's as they didn't explode like my Champion did. No offense taken to the guy who inferred that I installed them incorrectly. <br />As for stating that I should have purchased them at an auto parts store, I was only half kidding. I think the plugs I purchased at Boater's World were faulty. A friend of mine that sells ignition systems told me that he had been having trouble with recent purchases of Champion plugs.Originally posted by D.:<br />Of course I wasn't saying there was any difference in plugs between the boat shop and the autoparts store - just that the autoparts store probably has cheaper prices, and for me at least, is much, much more convenient (e.g a minute from my office vs. a 50 minute round trip across town). As for the problem you had, I have no idea. The only time I've ever had problems with a plug - whether they be NGK, autolite, champion or whatever is used in the various cylinders I have - is because I damaged it or put it in wrong. But I'm a ****ty mechanic and have that sort of problem with everything I try to "fix".Originally posted by Mid-size Johnson:<br /> When I got my Johnson, I put required Champion plugs in. I ran it once, one of the plug's ceramic came loose. Replaced that plug, ran motor again, started losing rpm's got back to dock, #2 plug had exploded and fried plug wire. Bought NGK's no problems since. Now I wonder, should I have purchased the plugs at a auto parts store? I bought them at Boater's World and paid a premium for them. Shouldn't all plugs be created equal?
