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Hi Neal
35 mm venturies require about 140 - 145 mains. In few cases up to 150.
I would say go back to the factory settings with the float bowl. then you are more secure at higher rpms. And of course check your fuel pressure.
The uneven running at 16-1800 rpms is most likely an error in your linkage. My bet is that it does not open equally as that rpm range is not where the transission area normally is.
As for the idle, try and screw the air bypass screws out by ½ - 1 turn. That will allow more air to go through the system hence leaving you the option of getting your idle screws furthewr out
Another thing. you write that your idle is now 900 rpm. Is that with the throttle completely closed ??? It sounds a little off to me.
The "drop on its nose" at 60 mph. could be a mix between a lean idle and pump jets being on the small side for the engine size. I´m pretty sure that 55 idles will create a lean setting on that size engine, so I would try and go up to 58 or even 60 and work my way from there.
If you need jets you can contact me, I can help you out with that.
Merry Christmas.
Torben.
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