I'm guessing that Victa 2 stroke has a G4 plastic carburetor. If so it has two wires coming out of the carburetor. One of them goes to earth, so resistance should be zero. The other one goes to the ignition module. Grounding that one kills the ignition. I don't know what its resistance to earth should be: if it is an electronic ignition you are probably measuring the backwards resistance of a semiconductor.
Do you get a steady stream of blue sparks across the spark plug when you pull the starter (spark plug removed, body grounded to cylinder head)? If you do, the ignition is not your primary problem. If not, check the coil to flywheel clearance (should be 0.012" or a visiting card thickness), check that the coil's ground wire is clean and making contact with the engine, disconnect the kill wire from the carburetor, and repeat the spark test. If it still fails the test, you need a replacement ignition module.
