A plug will always work best when it's new. If it's gaped properly, the engine is healthy, the proper heat range, the mixture is right, and getting good spark, it will last a long time.
But even under optimal conditions exposure to combustion will leave an ever so slight coating of carbon on the insulator. The carbon is conductive, so some of the spark charge will bleed off through the carbon. A too cold plug will accumulate more carbon, eventually to the point it will not fire at all.
If the original plug was too cold, then it could have been having bleed off problems, or if it was worn to the point the gap was too wide for the spark to reliably jump, a new plug will fix it.
But if the problem returns after a few miles, there could be a problem with weak spark at low RPM, or a too lean mixture.
If that has a carburetor, it is probably a slide type carb with a tapered needle under the slide. There is a snap ring with adjustment groves to set the position of the needle. Try raising the needle one groove. It's easy, and returnable to the original if it doesn't work, but I think you will like the results.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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