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02-09-2021, 11:07 AM | #1 |
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Join Date: Mar 2012
Location: lexington sc
Posts: 456
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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. |
02-09-2021, 12:25 PM | #2 |
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Join Date: May 2010
Location: Oregon
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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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02-09-2021, 12:33 PM | #3 |
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Location: lexington sc
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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 |
02-10-2021, 11:07 AM | #4 |
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Join Date: Sep 2018
Location: Grand Forks, ND
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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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02-10-2021, 11:56 AM | #5 |
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Join Date: Jul 2010
Location: Pennsylvania
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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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02-10-2021, 03:02 PM | #6 |
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Re: 1923 roadster running bad need help
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02-10-2021, 05:00 PM | #7 |
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Re: 1923 roadster running bad need help
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02-11-2021, 12:41 PM | #8 |
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Location: Portland OR
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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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