Yes they were Bosch magnetos. There was a special tool that screwed into the centre of the flywheel to pull it off the crank. Annoyingly the points gap had to be set with the flywheel in place as the cam was part of it. The “ windows” in the flywheel provided to give access fot feeler gauge and screwdriver, never seemed to be in just the right place.
Back in the 80s we were servicing lots of contractor and golf course machines so to make the job easier I cut the centre from a scrap flywheel to provide a dummy cam before refitting the flywheel – still got the puller and my dummy cam.
