No fire going to plugs

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CraigKennedy
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No fire going to plugs

Postby CraigKennedy » Sun Dec 27, 2015 11:44 pm

Hey yall, been busy as usual, got a new rebuild carburetor on my loboy today, when to crank and battery had died, hooked to charger and got to spin over good but still wouldn't run. Checked fire coming from coil, good spark, checked fire going to plugs, no fire, ever 10 cranks almost some fire. Lossing fire somewhere between the distributor cap and plug wires? Anybody had any experience with this?
Also i checked different plug wires by plugging them in the coil, and connected to spark tester, and grounded to head bolt, all had good fire, so plug wires are not the problem.
This is also a battery ignition system.
Thanks Craig

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Re: No fire going to plugs

Postby Eugene » Mon Dec 28, 2015 11:06 am

Remove the distributor cap. Check condition of the rotor and distributor cap.
I have an excuse. CRS.

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Re: No fire going to plugs

Postby CraigKennedy » Mon Dec 28, 2015 6:06 pm

Did that yesterday, also switched with another cap i had, still nothing. Tractor was running fine 2 weeks ago

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Re: No fire going to plugs

Postby Eugene » Mon Dec 28, 2015 6:14 pm

You have fire from the coil. This means that the coil and points are working.

Fire from each plug wire when switched to the coil. Plug wires are fine.

The only thing left is the distributor cap and rotor.

One other thing to check is to see if the distributor has slipped/rotated.

Any way, the problem is at or within the distributor.

Edit: No fire going to the spark plugs.
I have an excuse. CRS.

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Re: No fire going to plugs

Postby CraigKennedy » Mon Dec 28, 2015 6:51 pm

What could be wrong with the rotor or cap to make it stop working like that? I did take the rotor button off and scrated to down to the bare metal to see if it was a poor connection there, nothing happened.
Dont see anything wrong with the cap either?

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Re: No fire going to plugs

Postby muleboss » Mon Dec 28, 2015 7:00 pm

Check the rotor. I have seen the little square notch on rotor wear off and lets rotor slip some.

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Re: No fire going to plugs

Postby sford » Mon Dec 28, 2015 7:28 pm

I had the exact problem this past week on my loboy. Put a new dist. cap on it today and it ran like a top. I think the button on the cap was the problem.

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Re: No fire going to plugs

Postby John *.?-!.* cub owner » Mon Dec 28, 2015 9:02 pm

You stated battery ignition system, is it a distributor or converted magneto? Have you tried a new rotor?
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Re: No fire going to plugs

Postby Scrivet » Mon Dec 28, 2015 10:56 pm

Are you getting the notch on the cap lined up correctly and the cap seated properly?

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Re: No fire going to plugs

Postby redman36 » Tue Dec 29, 2015 6:43 pm

Lots of suggestions I failed to see anyone mention a rotor button shorted to distributor shaft. Take rotor off and look in shaft hole ,if carboned up replace it . It shorts coil to ground ,no plug fire even though you have fire at coil .

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Re: No fire going to plugs

Postby bythepond88 » Wed Dec 30, 2015 1:28 pm

Thank you, Redman. That would never have occurred to me, but I can see how it could happen.
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Re: No fire going to plugs

Postby Matt Kirsch » Wed Dec 30, 2015 1:54 pm

Even if timing were off, you should still get spark at the plugs. It would just be at the wrong time.

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Re: No fire going to plugs

Postby Eugene » Wed Dec 30, 2015 2:36 pm

bythepond88 wrote:Thank you, Redman. That would never have occurred to me, but I can see how it could happen.
I can't. The body of the rotor is plastic and a fantastic insulator. The metal strip that conducts the spark from the distributor cap center tap to the pointy end of the rotor is attached to the outer end of the rotor with a rivet.

In order for the spark to short out through the center of the rotor, the metal strip would have to be missing and a hole burnt through the rotor.
I have an excuse. CRS.

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Re: No fire going to plugs

Postby KETCHAM » Wed Dec 30, 2015 3:16 pm

I've had the metal tab on the rotor fall off before...maybe worn down to much....Got to be something simple...Kevin
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Re: No fire going to plugs

Postby aelzner71 » Wed Dec 30, 2015 8:46 pm

In reading this I may have missed something but in my case this sounds like bad points. For me that is what it was after similar symptoms including good spark at the coil and occasional but weak spark at the plugs


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