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I had a Boyer ignition system fitted on my old Triumph twin. I remember this lost spark system needs the coils to be changed to 6V items to work best.

When some bikes are left unused for some days their clutch may get stuck. To free it, one solution is to pull the clutch lever and press the kickstarter.

When a twin engine is misfiring, it is always useful to know if both cylinders are affected or only one , and which one. Once you know that, it is easier to find the cause and cure it.

Aermacchi Linto Marilina. A special built by Lino Tonti for himself.

I would try to disconnect alternatively one spark plug to see if the trouble affects one cylindre or both.

Do you know if both cylinders are misfiring or one only?

There are probably several malfunctions on this bike but the most obvious is that the clutch is severely slipping. This is the first and easyest thing to fix. At this stage, all the rest is a loss of time.

You're right

On my chain too, the split link is very hard to remove. but the good news are that you can remove the wheel without splitting the chain.

You say that you changed the condensators. Maybe, doing that, you swapped the orange and the grey wire from the points and now the ignition timing is 360 degrees out. I suggest you check the ignition timing first.

Are you sure you are in first gear?

I suggest you push the bike with your legs before releasing the clutch so the bike will not stall. Then you will check if the engine pulls and revs as it should.

Did you clean the pilot jet and check the float height?

The manufacturer of this bike is FN (Fabrique Nationale). A belgian factory near Liege. They retained very specific front suspensions up in the fifties.

It is not clear whether the problem is related with high revs or with wide throttle opening.

That's what I suggested one week ago.😉

Did you check valve timing?

I think that at the point of your rebuild you should not worry that much about the auto advance device. But, before trying to start the engine, do the static ignition timing with the auto advance in full retarded position and then check the timing in full advanced position. Then you can safely...

My experience is that a malfunction of the auto advance system does not cause the symptoms as described ninitially by Prisondawg The usual consequences of a faulty auto advance are kickback when starting, sluggish acceleration or revs not falling to tickover when releasing the throttle.

I suggest Prisondawg should tell us if the bike did previously run fine with the present setup or was it put together and never ran.