Biggasstractor................Do you mean 3007 Autolites instead of Champion. Never heard of this number for a Champion.
Claney

Terry, I don't think the spark plugs are causing the engine to shut down. You should check the usual causes, a lack of fuel supply and no spark. The gap on the plugs would have to be chocked solid with oil to stop the engine. Using good Champion plugs will not stop a running CAT 22. I have used different brands in my 22 and I have never seen a difference in the operation of the engine. The hardest "trouble shooting" for me on a CAT 22 engine, was when a small pebble that the fuel would push up and plug the main jet on the carb.. When the tractor would shut down the pebble would drop back and let it start up and run for a few minutes, then it would be carried back up and plug the jet again. The most common spot for fuel blockage is at the connection under the tank. You should open the drain on the carb. and see if you have a good flow after the carb. is drained. Good Luck, Bill

3J1Bill - Spark plugs don't have to be 'chocked solid' to break down, perform poorly, and even, not fire the fuel/air mixture.

One of the biggest problems I've encountered with spark plugs, is the center electrode insulation getting coated with barely visible deposits .. but those deposits are highly susceptible to tracking the spark, from the center electrode, up the outside of the center insulator .. and thence to ground.

Needless to say, a spark that is not jumping the air gap between the electrodes ain't doing much to ignite a fuel mixture.

I found that a good quick fix for this problem, was sandblasting the plugs .. and a better fix, was buying top quality NGK's, that never developed the problem ..

Some people I've known, swore by a good soaking in paint thinners to remove the insulator coating. All that I know .. is, like the Castrol ads say - "Oils ain't oils" .. and .. "plugs ain't plugs".

It's not hard to find a lot of people who swear at Champions .. not swear by them .. and that many ignition problems are cured by a new set of good quality plugs. Just my .02c worth for today.

First you gotta realize that the gasoline we get today is absolutely awful in a cast iron engine that tends to be slow warming up. If there is anything, and I mean ANYTHING, even slightly wrong with fuel system or ignition there's going to be problems. Just do all the obvious stuff first--fuel supply, carburetor clean, magneto up to specs, clean spark plugs, etc.

If you need to clean plugs as often as I have, try heating them with a propane torch--acetylene won't work, too much carbon--and trickle in a little oxygen from the welding torch while they are red hot. The carbon will burn like fourth-of-July fireworks clear up to the seal. It's a poor substitute for new plugs but it's affordable. (Check them carefully. Occasionally a porcelain will crack.)

I run John Deeres that were built to burn stove oil and they have problems with our present day gas if there is anything just one click away from perfect.

Good luck.

Jack

I've found that the older the petrol gets, it's more difficult to get my donkey engine on my 9U to fire up. After 2 or 3 months of sitting in a jerry can, the modern unleaded petrol seems to go stale, I always try to drain the donkey engine fuel tank after use and get fresh petrol in the can ready for the next time.

David

Claney,
I did mean autolite 3077's.
Sorry for the confusion.
Good Luck
Biggastractor