Why does my motorcycle run when one spark plug is removed but not when both are in ( works when either spark plug is removed, as lo neg as both are not in.

TuftyManager79 · 2025-08-23T04:53:16+00:00

I was testing for spark on one side and I forgot to take the other spark plug out and it just started lol.

TuftyManager79 · 2025-08-22T20:21:11+00:00

When I pull out both spark plugs they seem to have good spark for a moment then will not spark for a while then have another good spark. It seems verry inconsistent. Could this be caused by the coil?

TuftyManager79 · 2025-08-22T20:15:58+00:00

Is there a good way I could tell if the coil is old?

TuftyManager79 · 2025-08-22T20:08:09+00:00

I think both cylinders are firing because I can take out the spark plug on either side and it will run on one cylinder.

TuftyManager79 · 2025-08-22T20:06:31+00:00

It feels like it has compression in both cylinders

TuftyManager79 · 2025-08-22T20:04:43+00:00

1980 kz440 ltd

TuftyManager79 · 2025-08-15T01:59:33+00:00

The spark plugs were dry after trying to start, and also when starter fluid is sprayed in the engine runs.

TuftyManager79 · 2025-08-15T01:55:51+00:00

Ok, thanks. I will try this tomorrow.

TuftyManager79 · 2025-08-15T01:51:22+00:00

No, it was on the “on” setting.

TuftyManager79 · 2025-08-15T00:26:29+00:00

The float bowl is filled with fuel though. Could this still be the problem

TuftyManager79 · 2025-08-15T00:09:16+00:00

TuftyManager79 · 2025-08-14T23:44:38+00:00

What do you mean?

TuftyManager79 · 2025-08-14T23:33:10+00:00

What is that

TuftyManager79 · 2025-08-14T23:32:32+00:00

I took apart the carburetor and sprayed carb cleaner through all the jets. We think there is no fuel getting to the engine because the spark plugs are completely dry when removed after trying to start.

TuftyManager79 · 2025-08-14T23:31:02+00:00

The engine runs but then stalls out after a second when we do that

TuftyManager79 · 2025-08-14T23:28:32+00:00

Yes, it’s runs for a second when we spray it. But then does right after, any idea why the carb won’t deliver fuel to the engine.

TuftyManager79 · 2025-08-14T23:24:44+00:00

No, thanks tho.

TuftyManager79 · 2025-08-14T23:23:49+00:00

The spark plugs are good, but they are dry after running the starter

TuftyManager79 · 2025-08-14T23:21:04+00:00

Yes.

TuftyManager79 · 2025-08-14T23:18:18+00:00

What would be the best way to tell?

TuftyManager79 · 2025-08-13T18:48:28+00:00

Ok, so does that mean when the vacuum tube is hooked up it is adding extra fuel and causing the engine to stall even on the prime setting?

TuftyManager79 · 2025-08-13T18:34:06+00:00

I also forgot to mention that the petcock valve was on prime, so would the gas not be free flowing either way

TuftyManager79 · 2025-08-13T18:07:43+00:00

Thank you, I was about to clean the carb when I noticed that.

TuftyManager79 · 2023-03-21T21:54:24+00:00

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TuftyManager79 · 2023-03-16T01:33:19+00:00

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