Well I finally solved my starting marathon and CB you were right, it was Mag issues. My Mag was refurbished in 2021 and was never used to my knowledge until I purchased the bike a year ago. During my efforts to resolve the starting and after your comments I checked the strength of the spark and compared to my A7SS it was mickey mouse. But as when it very occasionally started and ran, I thought well it runs fine and I have driven it 10 miles. No suspicion.
So I contacted APL Magnetos Ltd who did the Mag resto and they suggested that due to possible the points being closed I should clean them, maybe they were corroded. So that's what I did, reset them and now she starts 4th kick from cold

Hallelujah
