the engine doesn't smoke at all anymore in all conditions (deceleration or acceleration) and runs as before ...very smooth.

A compression test should be done with all spark plugs removed, carbs wedged open at WOT. If the numbers you posted weren't taken using this procedure, do it again...you've gotten false readings.

Thank you for the information. Is WOT means without throttle?

WOT means Wide Open Throttle.

The manifold has to be opened as much as possible to the atmosphere to get all the air it can to do the compression test.

I addition to the points mentioned above, the engine should be at normal operating temperature.

Crank it just long enough for the pressure reading to stabilise.

Make sure you vent the gauge of pressure before doing the next cylinder:cheeky:

Thanks again for the information for the compression test. I will do it the proper way and will post the results in a couple of days.

I am amazed that I don't have anymore smoke at all.