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Old 02-09-2021, 11:07 AM   #1
kwisor
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Default 1923 roadster running bad need help

hello
my 23 has started to run bad i had the head gasket replaced and all the carbon cleaned, it idles fine but back fires ans loss of power. i do not have a compression gauge. i removed the no 1 plug and it was black with carbon. i have fire to all cycl. i have a rebuilt carb and good gas flow. what to i need to do from here
thank you
kevin

Last edited by kwisor; 02-09-2021 at 11:14 AM.
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Old 02-09-2021, 12:25 PM   #2
J Franklin
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Default Re: 1923 roadster running bad need help

What was the reason to change the head gasket? Have you adjusted the carb to run a bit leaner?
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Old 02-09-2021, 12:33 PM   #3
kwisor
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Default Re: 1923 roadster running bad need help

the gasket had a leakes of antfreeze in the rt rear corner no leak into the oil
kevin
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Old 02-10-2021, 11:07 AM   #4
rickd
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Default Re: 1923 roadster running bad need help

Did you make any changes to the carb mixture adjustment while doing your work? Spark plug wires re-connected correctly? Sounds like its running way too rich. When things like this stump me I slow it down and go back to the basics and recheck spark, fuel and air(mixture) especially when the car was running well previously.
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Old 02-10-2021, 11:56 AM   #5
Will N
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Default Re: 1923 roadster running bad need help

Maybe check for a vacuum leak at the intake manifold. I imaging you remove the manifolds when the head was removed. Did you use a new manifold gasket? Did you tighten the nuts down nice a tight?
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Old 02-10-2021, 03:02 PM   #6
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Default Re: 1923 roadster running bad need help

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Bent a valve removing otr installing the head?
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Old 02-10-2021, 05:00 PM   #7
J Franklin
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Default Re: 1923 roadster running bad need help

Quote:
Originally Posted by jetmek View Post
Bent a valve removing otr installing the head?
That happened to a friend. He and I were so careful and yet something touched a valve and it had to be replaced.
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Old 02-11-2021, 12:41 PM   #8
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Default Re: 1923 roadster running bad need help

Is it back firing out the carb or exhaust? No 1 plug is the coldest so what do the rest of the plugs look like? If the rest are black from carbon, then yes running too rich. Which type/brand of carburetor are you using? Turn the spray needle down till the engine starts to stumble and open a bit. May need a bit more adjusting when you are driving. Are you using the copper crush rings or the fiber type 3 in one gasket on the manifold? Google "MTFCA checking for vacuum leaks"
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