Re: 8N Stopped Firing Up

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Posted by Bruce (VA) on August 25, 2019 at 09:36:05 [URL] [DELETE] :

In Reply to: 8N Stopped Firing Up posted by AJ Derrick on August 25, 2019 at 08:33:34:

" Finally she wouldn't fire. I started with a new carb"

So, it wouldn't fire, and you replaced the carb? Not sure I understand the logic in addressing a spark problem by replacing the carb.


" So, it still won't turn over."

When you press the starter button, does the engine turn over or not?

Or, does the engine turn over and not start?

Big difference.

6 volt or 12 volt?

Front or side distributor?

I donít know why your tractor isnít running. Sure, I can make a reasonable guess. Actually, I can make a lot of guesses. I could toss out guesses like itís the coil, itís the condenser, itís this, itís thatÖÖ..honestly, are 10 random guesses helpful? Do you then list them in alphabetical order and start at the top?

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

I might not be able to tell you why your tractor isnít running but I sure can tell you how to figure it out yourself.

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 a dirty fuel screen.

Check for spark and fuel. (see tip # 13)

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 another new part for the tractor until you can answer this question: how do I know the part on the tractor is defective?

Once you narrow the problem to spark or fuel, post back and tell us what you found (and how you found it) and you will get plenty of help to get your tractor running.

* 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.



https://www.amazon.com/AMPRO-T71240-Energy-Ignition-Tester/dp/B00A8FO87S/ref=sr_1_fkmr1_4?ie=UTF8&qid=1513273147&sr=8-4-fkmr1&keywords=ampro+spark+checker




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