Sounds A1 on the electrics, has the motor got a dedicated ground wire?
Just for kicks, I know its got new stuff, but we are fault finding, stick a hot wire from battery
terminal to EI power in, and see if the fault is still there, it could be a bad crimp somewhere.
Back to the carbs.
I have never adjusted AMAL
floats, but I read here about stay up floats being different from the old plastic types.
So long as they were both the same I would be happy.
These are new carbs, it would seem fair to assume the slides are not too worn.
As master JH commented earlier, the pilot system is fairly independent of the needle jet , it does need some air through the slide but its discharges are separate from the NJ, yeah they overlap, no idle is not the NJ, .
Pilot jet fuel is lifted through the wee hole in the float bowl bottom , passes through bowl gasket face drilling then to the mixing chamber where it says hello to the metered air from the carb mouth bell drilling, I would be looking very hard indeed at the continuity of all those passages. its hard to imagine a new float bowl being warped but its not out of the question, if the pilot fuel passage can suck air at the bowl joint then thats game over until the surfaces are mated correctly. i hope its not that.
Whats doubly weird, its twin carbs , right? I know with my twin carbs, even if one is a bit bad the inlet balance pipe helps share out a runnable mix, so for both to have a manufacturing fault that nixes the pilot settings seems unlikely, not impossible though.
As a starting point for the carbs, pilot air screw one turn out, let slide bottom then raise two whole turns with the throttle stop .
Have you got chokes fitted? If not, have you plugged the cable inlets ,?
I was taught a primitive carb cleaning trick that sometimes saves a lot of messing around, it pertains more to contaminated fuel, but it can sometimes help clear a passage with no strip down.
Remove air filter so you can slap your palm over the inlet, start motor, rev up a bit, slap palm over inlet.
Crude, very effective sometimes, it wont clear a plugged pilot jet though, it will shift water.
Some insects like to crawl into open holes, my Cagiva attracts a tank overflow breather fly.
Clutching at straws here.
Some other off the wall and on the wall carb faults I have been party to.
Slides in the wrong carbs, I dont think you can do this with Amals , you can with Mics. 5 mpg.
Float catching , either on gasket or flashing rubbing against bowl. Usually floods.
Wrong float bowls with small feed orifice at float valve.There are numbers on the bowl you can look up on the AMAL
site. Wont affect idle.
Dislodged needles, easy to do , if I dont put my specs on. Wont affect idle.
Air leaks at inlet flange / mount rubbers. High idle /spit back
Shite float needles / seats, causes flooding.
Bad HT leads, missfire above 3K.
Rags left in one carb port, Doh! Only runs on one.
Carb lid on the wrong way round, never done it, put its quite possible, shouldnt affect mixture.
12 volt coils v 6 volt, easier starting and more pull at higher RPMs with 6 volt. Shouldnt affect idle.
Faulty ignition switch, cut outs, stalls, backfires. Will idle then stop.
Carbs can be weird, a good machinist up the road from me made new close fit slides for his A65,maybe 0.001 fit instead of the stock AMAL
0.003 or more. His bike wouldnt run, he borrowed an old set from me and it ran fine.
If you could borrow another set that would help a great deal.If the fault persists you could safely rule out the carbs, untill then , best O luck, hing in there.