alright peeps, the cap is new an rotor arm. i checked the cap yesterday, still no luck.

The leads are all sparking. Even no 3 lead sparks aswell. I took no 3 lead off the plug pushed another plug into the ht lead and rested it on metal on the engine i.e earth'd it. Then cranked it over and the lead is working and the plug is sparking. IT just not doing it when the plug is screwed in, OR it is sparking but a valve or something broken inside is not allowing it to run right due to incorrect combustion or valve not sealing or seating properly.

Any thoughts on this idea folks?

cheers