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carb needs cleaning, you may have a air leak. spark plugs being fouled up , and might even have timing out. there is 2 jets or more in the carb if there is a problem it can weaken fuel having choke on can give it more air and fuel. depending on model of engine. on fuel in line there will be a filter, very small these can get damaged and let sludge from the tank in. clean out the carb remove it and open it up clean out and you will see brass like screws blow them out with an air line, refit with new seals, you can make them if they not available. or you a sealer thats for fuel.. air lines you can spray them while engine is running and if engine pitch changes that can be were the air leak is.
That engine runs at low speed, starts and idles on the center carb only. first make sure the carbs are synchronized so the front and rear ones are fully closed at idle, then adjust idle speed and mixture on the center carb. Sweet ride by the way, if you get tired of working on it and want to get rid of it I will take it. LOL
have a shop check the tension on the choke settings in the morning before car is started,and reset fast idle on choke settings,then when car is run and heated up it will trip off the choke settings and fast idle and return back to normal settings
On the Carb to Intake manifold there is an AIR/FUEL volume control screw. Gently screw it in Clockwise until it bottoms out, then back it out 2 turns.
Next, find the Throttle Butterfly Fast/ Slow idling screw, and back it out until the Throttle linkage is released.
Then slowly wind it back in 2 turns
If you have SPARK and FUEL up, then it should Fire Up.
When it does, using the Air/Fuel screw to stabilise the idle mixture, adjust the Idling Speed Screw to run balanced at around 750 RPM.
All the best and Regards, DT
Got a quadrajunk carb on there? If so, unscrew the needle valves in the front of the baseplate and spray carb cleaner into the ports. Put them back in and turn out about two turns each. adjust back and forth to get the highest vacuum reading, then use a tach to get the best steady idle.Do this with the advance disconnected and plugged, adjust final idle speed with linkage adjustment.