Re: tractor runs rough

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Posted by Bruce (VA) on December 01, 2017 at 17:36:40 [URL] [DELETE] :

In Reply to: tractor runs rough posted by mike on December 01, 2017 at 13:10:41:

" Any ideas? What can I do? "

There are 2 answers to that question. The short answer is what Farmer Dan said.

The longer answer is learn how to troubleshoot a problem before you start buying parts.

What you have done is replace good working parts in an attempt to fix an undiagnosed problem. Iíve done that and Iím sure others around here have done it too.

You have spent probably $50 plus hours of time & frustration w/o having the slightest clue as to what is causing the tractor run rough. Worse yet, by replacing all of those parts, you have probably introduced more problems. For example, you have cut the life expectancy of a new set of points by sanding them. Dressing points with card stock or brown paper would have been a better alternative.

The one way that I found the best results with is to take a systematic, step-by-step approach to solving the problem, working from most likely to least likely. The trick to fixing these tractors (or trouble shooting any piece of equipment) is to be systematic about it. You need to isolate the problem step by step and work from most likely to least likely. Jumping ahead to 'so-and-so said it could be whatever' or just replacing parts usually just wastes your time and your money. I know it did for me. Remember, it takes three things for an engine to run: spark at the right time, compression, & fuel in the right mixture. For the moment, forget about compression & concentrate on narrowing the problem to fuel or spark. If you donít do that, you are going to end up chasing your tail around that tractor & spending a boatload of money to fix what could easily be a loose wire or faulty ignition switch. I offer this advice from personal experience because I am not a mechanic. I do not have the ability learned after 30 years of working on an N tractor to simply diagnose the problem & go right to the fix. So, whenever my tractors stop, it's 'check spark, check fuel' and then go from there.

Donít guess at the cause of the problem; guessing can get expensive. And leave you breathless chasing every could be this, it could be that......just troubleshoot the problem and leave the guess work for buying Lottery tickets.

As soon as the tractor stops running, not 5 minutes later, check for spark and fuel.

You need to answer 2 questions before you do anything else:

With the bolt in the carb bowl removed and the gas on, will the fuel flow fill a pint jar in less than 2 minutes?

Next, get out your adjustable gap spark checker * , open the gap to 1/4", hook it up, turn the key on and crank the engine. Does the spark jump 1/4"? Post back with the answers.

And do not buy a new part for the tractor until you can answer this question: how do I know the part on the tractor is defective?

* Don't own an adjustable gap spark checker? Buy one! Not a test light! Until then, take an old plug, open the gap 1/4" ground it to the head & look for spark. Itís not the color of the spark that counts; itís the distance it jumps.

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