which plugs should I use

BOH

Member
I changed the plugs in my D-14. She had Champion J8C. The new set of the same had 2 new plugs that gave me trouble. No matter where I put them, they would not fire all the time. I gave up and installed NGK B6S. Ran like a new one...until I hooked up the brush hog. It still runs great until I get into thick cutting, then it faulters some. Do I have the wrong NGKs in her. Should I try hotter or colder. Thanks in advance. BOH
 
Whatever crosses over to an AC Delco 45 should work. Stay away from Champion plugs. You must gap them at .025" which they will be much wider than that when you take them out of the box.
 
when buying plugd at napa for instance the parts amn will tell u what plug it should have then take your pick if you want a hotter or coldeer
plug. not the best thing to be reducing the gap on a .044 plug as the tab will not be square to the electrode. nothing wrong with champions
anyway and dont know why people print nonsense. champion is a lot better plug than autolite.
 
I have Champion spark plugs in most every engine on the place with never a problem.
 
I'm 65 years old, and as far back as I can remember, Champion spark plugs sometimes don't work well in an AC engine. I have no idea why, but I know it's true.
 
(quoted from post at 20:18:03 08/15/20) when buying plugd at napa for instance the parts amn will tell u what plug it should have then take your pick if you want a hotter or coldeer
plug. not the best thing to be reducing the gap on a .044 plug as the tab will not be square to the electrode. nothing wrong with champions
If one tries to run plug gap at .044" you will have a miss-fire under heavy load. Suit yourself. I know the angle of the electrode is crooked, but that's unfortunately the way todays plugs are. The man is complaining of miss-fire and if he isn't closing up the gap on new plugs to .025" that may be all that is wrong !!!!
 
Put new Champions in my JD D. Wouldn't even fire Put the old ACs back in and it runs fine. A friend put new Champions in an IH 2400, wouldn't fire. He put the old ACs back in and ran it. My Oliver 80 has Champion W10s in it, Runs perfect. Through the last 25 years, I have had many problems with Champion, I stay away from them when I can.
 
Thanks guys. Yep I always check the gap. I have the original owners manual (it is a 1957) and it says .028-.033. I set them to .030 prolly try closing them to .025 first, then I guess I'll start down the list and hope for the best. I didn't notice any comments on going hotter or colder, so will just try the above first. Will let you know.
 
I don't think a different heat range spark plug is a big deal right away with new plugs. That's more of a longer term thing to get the appropriate color on the plugs. I have taken to putting the hottest plugs I can in my old tractors, as they don't work hard like they used to.
 
BOH when you speak of hotter or colder do
you have in mind a " hotter" spark? If
not the 295 Autolite should do the trick.
I have found they work good for me in old
tractors. If you are thinking a hotter
spark I think you should do some research
on spark plugs. As I understand heat
ratings do not have as much to do with
spark as most folk think. Not saying a
different plug would not make some
difference but rating has more to do with
heat displacement of the plug. To each
his own, but I have replaced 3 sets of
different brand plugs in D14 in a 2 year
period. She has been running good with
295 for 3 or 4 years now.
 
for one thing if he bought the plugs rated for the engine no way they will have a .044 gap. and nowhere did he say he had them gapped at
.044. and you are trying to tell me something i know about. you will not get a good spark with the tab at an angle. and the electrode will
wear away on an angle and less plug life. i was taught how to do a plug gap properly over forty years ago in mechanic's schooling. the gap
is opened up sandblast the plug file the electrode flat and regap. in the garage i would keep plugs other guys threw away. maybe you need a
cooler plug.
 
the thing is did you make sure the points are not burnt and set to spec. also check the coil, condenser and wires, you will not get the
plugs to fire properly if the other ignition parts are not up to snuff. on a hot plug the electrode will be thinner than the standard plug.
on a colder plug the electrode will be thicker than the standard plug. you use a hotter plug when doing light work and cooler when working
the tractor hard all day. plus read your spark plugs to see what they are doing. if burning blackish go hotter. you want a nice brown. i have lots of tractors of all kinds including an allis wd45 and most do have champions in them. also these tractors came from factory with champions. i even make a point to ask for champions when i buy some which is seldom.
 
Well i re-gaped the plugs to .025. She is running quite a bit better. The plugs haven't been in long enough to get a good color yet. Thinking more about it the old plugs were kind of black, but not too bad. I probably am not working her hard enough for the B6S. I think when the day is done I will end up with the next hotter plugs. Thanks Again everyone. Always a ton of info here.
 
ha ha , john deere D'S were born with champions! and for the D'S being made for thirty years and i have seen a lot of them and they all had champions. now how did those farmers get there work done if the plugs would not fire??? very hard to believe that story when a tractor has more than one plug, and no way all plugs can be bad out of the box.
 
Well, you may not believe it but, it happened to me. If the tractor was running decent and you put in a new set of plugs and it wouldn't fire then, put the old plugs back in and it fired right up, I find it kinda hard to believe that it's not the plugs.
 
(quoted from post at 19:37:25 08/16/20) ha ha , john deere D'S were born with champions! and for the D'S being made for thirty years and i have seen a lot of them and they all had champions. now how did those farmers get there work done if the plugs would not fire??? very hard to believe that story when a tractor has more than one plug, and no way all plugs can be bad out of the box.
No one ever said every Champion spark plug taken out of its new box was bad. But, any reasonable customer would expect EVERY one to be GOOD.!!! and to have one bad one out of 10 or 20 or 30 is unacceptable !! And as far as a "D" John Deere goes, they were very low compression and used plugs the size of a 1 inch deep socket. There is a very good possibility the Champion brand was just fine in that application, but I've seen Champions of a smaller size that just didn't work well and switched to AC Delco and the problem was solved. In 50+ years I've never had one bad AC Delco plug out of the box, and have replaced Champions that didn't have any run time on them to speak of because they had failed. Just get over it.
 
you get over it, my wd45 has uj8 champions and runs very good. and i am very aware of j. d. plugs also W-10's and my old ih's have them
also. i am sure i had those big 7/8" W plugs in my hands before you. ha ha.
 
My experience with Champions is when I got out of trade school and was working in a small engine shop I had a whole box of 10 CJ8s come back as no
starts. Since I was the only guy in the shop, I didn't order any more champions. Later on in a Chrysler dealership, it was a daily occurrence
replacing champion plugs for misfires under warranty. Because my name is on the job, I don't use Champions in anything. Maybe they're better now
than 30 years ago, but I'm not taking the chance.
I wouldn't narrow the plug gap to keep from misfiring under load, I would address the reason why the ignition system is breaking down under load
running the factory specified gap. Leaking plug wires, bad condenser, burned points, weak coil...
 

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