Hi again,
replaced plug and coil leads and all connectors.. Multi spark is gone. Discovered coil to distributor low tension wire nearly broken, only a few strands left holding at the distributor end so has been replaced. Spark at the plugs while cranking as suggested above is yellow white but not sure it is of the "fat" variety were looking for. Also discovered the bolt holding the distributor clamp bracket to the cylinder head was loose and tightened up, clamp bolt is secure. Still no joy and can't even get it to run
How does one determine that the coil is getting the voltage it requires as mentioned above ? Bit of a grey area for me I've never been able to grasp the intracacies of electrical goings on very well just not my forte!!
The distributor cap is an old original type with side exit leads and I have suspected this from the beginning but it's one of the more expensive options to replace. Earlier when I could get it to run I observed it in the dark and could see no signs of tracking on the outside at least..
As a side check there is fuel to the carburettor and it was running ok previously. The plugs appear to be slightly wet when removed so am assuming fuel is getting thru to the cylinders.
In respect to Tortrons comment above re the distributor body being loose on the shaft I'm not sure what to look for there, do I need to remove distributor to check that out ?
Frustrating !!!!