Tuning my webers part two....

[Jac Mac]

At 395 cu in & therefore 810cc per cyl I would suggest that '70' idle jets might be a better choice. sounds like there is a slight lean spot at light throttle cruise conditions @ those RPM where the carbs are probably at the top end of the transition point from idle to main circuits. As the F16 is richer than the F7 you replaced its unlikely that this is the cause.

[Snakebit]

The f16 tubes are leaner than the f7 tubes. The f16 are 8.2mm in diameter and I think the f7's are 5.25? The set up I tried was:
40 chokes
120 holders
65 idle jet
f16 tubes
170 mains
225 airs

The set up was too lean, a lot of popping through the pipes. I switched to f7's with 165 mains and 200 airs. Popping was gone but above 2500 rpm it ran like crap. My guess it is still a little lean. I'm going to try 170 mains and see what changes.

[priobe]

I would stay with what you have with the holders and idle jets, if it is working for you upt to 2500 rpm.

Your transition comes in around 2500 - 2800.

If you are having problems with transition I would lower you air corrector from 225 to 200.

This will help brake the fuel for the transition.

Here is a test.

pull the main circuit out and take it for a drive and see of your still expeirencing the problems up to 2500. Dont step on it just drive normal and you will see the idle jets will take you to 2500.

This will prove your problem is with the main circuit.