The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: Gearbox on 20.04. 2026 12:46

Title: Kicking back when starting
Post by: Gearbox on 20.04. 2026 12:46

A10 with Thorspark ignition, been running fine for years but now kicking back and spitting from carb when trying to start, when going, runs fine
Manual advance/retard system, checked it is working OK, If it was to slip, assume it would retard rather than advance,
checked carburetter, all clean and correct nothing changed there, next job is inlet valves.
Anyone with other ideas please

Title: Re: Kicking back when starting
Post by: Gearbox on 20.04. 2026 14:09

Well, that's typical, been looking at advance retard again, adjusted the cable a bit, cleaned carb again. Started 1st time, idling very nicely, not sure what sorted it, but happy now

Title: Re: Kicking back when starting
Post by: CheeserBeezer on 21.04. 2026 00:25

Air leak at manifold?