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More information. was the carb removed from the car, when you say clean, was it taken apart. float/needle valves/etc. flooding is usually caused by the needle valve not properly reseating when the bowl is filled. how do you know that the carb is flooding.
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Was the carb sitting for years before you bought it? Probably the needle shut off valve is stuck . Where the fuel line goes into the carb, try firmly tapping (wack) the carb housing with a screw driver handle. If it still floods, its take apart time. Was the "experienced drag racer" a driver, or mechanic.? Apparently he don't know much about carburetors.
It's possible the coils are loosing capacity when hot, is the choke sticking, is the carb's mixtures set corectly.
Maybe try Google search your year, make and model, manual
Sounds like an O2 sensor, however you might try cleaning the MAF sensor in the air intake hose with carb cleaner (blow it out after spraying it and put it back in). MAF sensors are expensive and you can clean them with spray cleaner or starting fluid and usually not have to buy one. O2 sensors are cheaper and won't cleanup using this procedure.
Possibly a hole in the float . ( carburator) You'll have to take the carb apart and remove the float. Shake it and see if there is gas in it. If it's not a brass float, you may just need to adjust it, and clean the carb.
It sounds like the carb. float is set to high and /or the needle and seat has some dirt in it allowing to much fuel inside the carb.. This will allow to much fuel into the engine.It seems the carb could use a rebuild and dont forget to replace your fuel filter.I hope this helps.
notorious for being very hard to time both carbs ..sim. probs.haunt many multi carb . set ups just ask any one with old triumphs .if carbs have never been rebuilt i think it might be time .if they have it might be time to replace .if replacing try finding ones with a fule management system.
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