Thank you Max for your detailed information. I'll reset everything in the morning and have another go at getting the points in the right spot. The magnet on the flywheel seemed to be good as the key fell out of the keyway and was caught by the magnet in the flywheel. The mower does not have the original low mounted air intake assembly shown in Model 5 material, or the longer assembly shown in the Model 4. The mower takes the large Victa 225mm long paper filter in the housing, which I replaced with a Bynorm filter and pre-filter as the old one was floating loose inside the housing and wasn't effective. The air filter assembly starts at the carburettor with an original rubber hose (only goes about 30cm up the lower handle, but then connects into the standard rippled plastic air hose used on modern 2-strokes. I pulled the plastic tube off both ends and re-sealed it with silicone and wrapped each end with electrical tape to stop any excess air accessing the air pipes. As such, there is no restrictor in the air intake on this engine. I meant to take a photo of the mower to show the configuration, but forgot. I also cleaned the spark plug after I first started the mower when I found it was backfiring, but that didn't help as plug looks pretty new but was black. That said, I took a photo of it today and it is again black with the electrode looking dark brown. I may need to find the right part numbers so I can get a correct set of points and possible condenser and/or ignition module to match a motor with the 3F carburettor (Not a G3 or G4). Will see what happens in the morning. Appreciated. Regards. Daryl.