Have found out that to check and clean points the total engine has to be removed with the mounting plate held on by four nuts and bolts. this is because the engine is very close to the mower framework,and removal of flywheel cover is a none starter.
Having removed the carb and cylinder head I found that a lot of short engine running had left the engine coked up very heavily,so a decoke had to be done.
The sparking problem luckily was a quick fix,there was a little life there but when flywheel was removed the points themselves where so bad with corrosion and high spots a full removal and a rub on the wet stone brought the point contact faces back to a high standard. a quick spin on the fly wheel then produced a spark which could jump 4 mm onto the engine a great result.
