(in a good way). After a complete carb strip, petrol tank tap off for a de-gunk, and fresh fuel, my CCM now starts as it should, just on the choke. Once warmed up, choke off, the engine runs smoothly through the rev range without coughing. Sweet music.
Later today, I'll take the bike to my Mum's farm for a proper shake-down blasting up the rough driveway. BP