Well. Fiddled about. Connected spare wire to earth. Cut the one going behind flywheel. And cut the one to throttle stop and connected it to a proper earth. As usual I hold spark plug lead and pull string. Bam!! Nearly fell offer . Yes!!! Great a good spark. And I seeing stars. So it’s going. But under load still struggling. Must be fuel. Yep u guessed it. The filler cap hole was blocked. Very restricted airflow. So sorted. Well done everyone. And it fits in well with bike and car.