Thank you for the tip.
I contacted them and was advised to buy a new carb assy,
what I will do.
I will keep you informed.
Thanks.

The carb assy arrived and the leaking is over, but
still very difficult to start the engine. If I take the spark plug out and hold it against the engine while trying to start there’s no spark.
However after many times starting it starts and the engine runs fine. Once I stop the engine it’s very difficult to start it again; sometimes it starts immediately sometimes not at all.
So I opened the ignition-part and that was very dirty and rusted. I cleaned everything but still the same result.
Is it possible to test the ignition coil?
Is it possible that a bad ignition coil works sometimes and sometimes it doesn’t.
Thank you for your reply.

I measured the ignition coil.
Coils resistance primary is 0.13 and secundary is 9.73
Multimeter on 20k
I don’t know how to measure the clearance from the rotor to ignition core because the coil is located at the inside of the flywheel.
Is that ok?
Thank you

Strange, I read that Coil resistance is: primary approx 0.6Ohms, secondary approximately 12.6kOhms, the Kubota-manual states.
But as there’s no spark when testing the spark plug “outside” the engine; it has to be the ignition coil- no more testing required.
Thank you

Flywheel before cleaning