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When I still had dual fuel I took the carby apart and found the shafts had so much gap you could drive a Mack truck through.
Off to the carby joint and bronze bushes were installed.Float level and needle and seat were replaced and the Auto choke was fixed. There might be more but just ask away.
When U screw the screw in does it come to a stop when all the way in or does it keep turning?
Have U found the idle screw? Not the choke screw.
I'm a technician by trade I have never worked on one and likely never will but when we get carbies in the three 50+ blokes I work with help me. The thing is I'm planing on running a street demon these guys don't know what they are. Carby diag is common sense with the right training, if you can fix a webber than you can fix a quadrajet because diag is the same even though design is different.
I fixed the carb on my mates honda road cruiser bike the guys at work had never worked on one of these carbs. You know how I fixed it? I pulled it down and traced every circuit and found a diaphragm not working because of a blockage and it worked. initial diag was sparying cooking oil on the plunger and the bike ran perfect until the fuel washed it off. So I discovered a port that keeps fuel on the plunger to keep vaccume using a fluid seal.
That is an example of using common sense.
They fix standard cars. We used to have a dyno 30 years ago but the big boss made the decision to get rid of it. We don't do performance upgrades. Seeing as street demons are relatively new they don't work on them. I can't remember the last carby car we had in tbh we rarely see stuff older than 2000. New eruo cars yea we have plenty we have a 2016 4cyl diesel merc in atm with noisy lifters on start up which we have to solve on top of the X-mas rush.The 50 year old fellas don't know what a street demon carb is? Surely you aren't being serious....