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Thanks for your photos.
I wrote a little confusion.
I know how its made the seal, but i don't know how They orientation in the crankcase.

Please look the video by link below

https://youtu.be/YTBIqL2WJmU

It's a pratical test that the engine have another way for The inlet air.

Have you some photos of the internal seals?
Side clutch and flywheel. And how these seals are mounting.
And The troubleshotting during assembly.
So, When i'll speak with mechanic, I'll understand If He Tell me the right thinghs.
Many thanks in advance

Yes, Big work but it's Not for me.
I've already payed the mechanic for replace the seals.And Now, He must replay the work.
I Hope that the crankcase haven't problem like crack or Small hole that the mechanic didn't look while He was working.

I agree with you about the flower. I Told Her about you message, He agree with you:-). Please look the pictures. This morning, the mechanic took me a new cylinder+ piston. He Told me: your cylinder is ok, but you try this new ore. .. At The end? If i Closed the carburetor with a piece of paper, the ...

I'll take some photos this night when my housewife sleep....

No, Please look the picture.

I rebuilt the engine, i replaced only seals and bearing of the shaft.
The muffler was old but ok.
Also the cylinder was in Good conditions.
I tuning the ports in front of exaust. I increased its height 5 mm.
So, Now They open before the Main ports

Good news : The engine run for few second! I bought a new carburetor and i replaced the wire From coil to spark. The bad news: The engine run only with a gas like "quick start". When the gas finisched, the engine stopped. After thirty minutes and Ten time run the engine, i opened the intak...

i forgot to write one thing : i took another float + valve from another Ape that I know the engine run very good.
And The gasoline lake was appeared the same.

I cleaned the carburator in all its parts
I dryed the crankcase and I tried to run the engine without touched the throttle. Nothing. I moved the engine 30-45 sec
After that, I disconnected the intake Collector. I found a big lake of gasoline into it!.

I replaced the external high voltage coil with other new coil. Nothing.
After that, i replaced the new condensator with older. Nothing.
I checked the time timing. It was ok.
I tried to run the engine 4 time. I didn't move the throotle.
The crankcase and The intake were full of gasoline.

After a night that i though many hours, i decided to change the external high voltage Wire.
I Hope to reach the goal!
I found out that it is similar of fiat 127.

Very bad news I install a new spark plug. Nothing. I rotated in every position the puntine. Nothing. I Closed the gasoline, disconnected the filter, empty the carburetor, dryed the cylinder. Nothing. I found into the intake a Lot of oil I tried to start the engine with espress gas at full throotle. ...

I didn't remove anithing From high voltage bobin.
No, Because i don't understand Where you connected the Wire on the top of screw driver.
So, i use a device tester in order to do like your test.

Good and bad news: The timing is correct. I followed your advices and The ignition is correct. The switch "on", I rotated the flywheel by Hand while i looking the hole in the flywheel, the spark plug led ignition! !! But Nothing. I dry the cylinder, i empty the carburetor and after i run t...