Thanks very much for your replies guys - it's much appreciated.
I had a check of the coils tonight, both the stator, pulser and ignition and all the resistances check out.
When i troubleshooted the CDI I couldnt get anything that the owner manual said i would
I was getting a resistance of about 455ohm in connections that were meant to be "ON" i assume that means no resistance? and "CON" would have very little resistance.
The terminals that were meant to have 2Mohm resistance had about 700kohm.
I'm thinking that my CDI is cactus, though I'm due for a new ignition coil as the lead is all but snapped off and I be losing a lot of spark through that.