My Tecumseh engine currently is having trouble getting spark. The magnet on the flywheel is about 1/3 of an inch away from the magneto( I think that's what you call it). Is it to far away? There is also the small metal square that is on the magneto that's closest to the magnet, it seems to have some blue threads (like fabric on it). Is that supposed to be there? Should I take it off? Thanks
Engine with no spark .need help
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Russ2251
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Definitely.
Between .010" and .0125" is required maximum clearance between coil laminations and flywheel, about the thickness of a business card which can be used in a pinch. A set of feeler gauges would be better
Probably not.
Ok, I have a white and bluish spark now. When I don't have the plug inserted, and I pull the cord, it creates a spark. When it is installed, it should do the same thing, right? I'm trying to figure out if it's a ground wire problem or something else. Even when I spray starter fluid in it, it still won't fire. Any tricks to get it to go?
Thedude
New member
Take the magneto off and rotate the engine to TDC. Put a piece of paper between the flywheel and the magneto. Bolt the magneto back on and rotate the engine to BDC and remove the paper. This has worked every time for me. Hope this helps!
Russ2251
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.010" absolute minimum. Paper (typically) is only .004", or less than half of factory spec.
Yes.
If plug is serviceable engine should fire.
Remove plug and pour in a teaspoon of gas into cylinder.
Replace plug and crank it over. Should run after 1 to 3 pulls no choke.
Russ2251
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Avoid starting fluid. Never use it to start an engine in liquid form.
Doc Sprocket
*********
Thanks to info found in this forum, I have found standard business cards to be particularly effective for this. Makes it a no-brain setup. Slide the card in place, Loosen the bolts, let the magnets pull the coil lamination into place, snug everything down, pull out the card, way you go...
Russ2251
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x2
To meet factory specs, go for a set of feeler gauges.
To meet factory specs, go for a set of feeler gauges.
sideways
Unfinished projects king.
x2
To meet factory specs, go for a set of feeler gauges.
+1
If your working on engines you'd be mad not to get some.
Hayden
Russ2251
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I have had new plugs that refuse to fire in older engines but will fire in new engines.
Sometimes resistor equipped plugs are the culprit.
What is plug number, and is it new and gapped to spec?
Sometimes resistor equipped plugs are the culprit.
What is plug number, and is it new and gapped to spec?
It's a Tecumseh, not a Briggs. And the spark plug is new, I think the number is RN4C or something like that, I will find out the real number soon. The plug is made by Champion if that helps. I am getting spark now, maybe it is not big enough to ignite the fuel though? How could I change the timing on it?
Russ2251
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If you can see/hear spark, I would say you have plenty.
Did you try a teaspoon of gas in plug hole no choke with throttle 1/3 open?
Should run for a short burst to a couple of seconds if everything else is correct.
What model Tecumseh?
Did you try a teaspoon of gas in plug hole no choke with throttle 1/3 open?
Should run for a short burst to a couple of seconds if everything else is correct.
What model Tecumseh?
Never mind, my new pull start assembly just broke, and I can't repair it. I think I will just get a harbor freight clone, i already sunk over 80 bucks into this engine and I don't want to put anymore in. Is the shaft size for the clone 3/4 inch with a 5/16 keway, I just don't want to have to buy a new clutch now.
Russ2251
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Yup.
I might be interested in purchase of Tecumseh ("as is") if you're looking to unload it and price is right.
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