bn running poor

I am working on my bn. Idles great. Went to push snow today and it is running poor under a load. I am going to replace the spark plugs since it has been awhile. My question is what would be the best spark plug considering the gas we now have to use. I was considering the autolite 3116 but open for suggestions.
Todd

What ever auto lite matches the D-21 champ is what I would use. But before throwing parts at it check things like your spark and make sure it is a good blue/white and jumps a 1/4 gap or more. Also make sure you have a good fuel flow out the drain plug in the bottom of the carb and pull that piece of ice out of the air cleaner yep if you have not changed the oil in it lately you have a piece of ice in it and that will cause that problem also

If Old's solution doesn't work, try this: my 1945 A (same engine as your BN) had a similar issue today. I adjusted the mixture needle outwards a hair and a half and that seemed to clean up the problem.

And Old is right; definitely use Champion D21 spark plugs, or else you will risk the tractor running poorly. Don't ask how I know!

Ben W. in Va
OldPathsEquipment.com

I prefer the auto lite cross of of the Champ D-21 just do not have the auto lite number handy. Any more the champ plugs do not seem to hold up well but then maybe that is because they are now from the land of almost right

Old, I have seen a similar pattern for many Champion spark plugs these days. Junk. It's a shame, since Champion used to be one of the best.

The Autolite crossover is a 386.

You are probably right that Autolites are best. You are the man to know! However, my A will only run on Champion D21's. On my first restoration, a Farmall Super A, Case IH gave me Autolite plugs. They worked for about a month before they acted up. Started the tractor and it ran like a pile driver, snorting and acting like it was over choked, reving and literally exploding gas in the exhaust manifold. I shut the thing down and dropped in the four D21's that were in it when I bought it. It started back up normally and has run great since.

My other A did a similar trick on Autolites. It suddenly started losing power down the highway in road gear. By the time I turned it around towards home, it couldn't drag itself in first. But four new D21's later, didn't touch a thing else, and it was ready to roll. I now keep four D21's in reserve, just in case.

I pass the floor to you, Old, though, as I have read these forums long enough to know that you are an expert on red tractors.

Now, I know that "what's best" depends on more than just a plug. Fuel mixtures, timing, etc, can give different figures. Assuming the perfect tractor that is required to work in the field, what spark plugs best match what IH put on the machines? Have you found Autolite to be the best?

Ben W. in VA
OldPathsEquipment.com

An expect I am not I just play with enough old tractor be they Orange or Red or green or gray I just like tractors. Most of the time I have found the auto lites hold up better then the champs but then some time you still find a good champ. With out looking I can not say what I have in my BA which is the tractor I built using parts of 2 Bs and one A and made me a BA. Also known as the Bad A$$. Shoot for all I know I may have both brands in that thing since I used 99% of used stuff to build that BA. One trick I have found that helps with this new crap gas is to widen the plug gap to around 0.030 -0.035 and they seem to run batter