The info on the 700r is great thanks AVB. I have amassed quite a few of the Ryobis and MTD's with the ryan engines. The one with the current problem is like a CS26, so I will have a go on that one - only cost $1.50 from the tip, not in great condition, it works - but the lead is only just long enough.
Norm, I feel pretty silly now - I have 3 buggered coils (infinite resistance between lead and coil body) - 2 trimmer ones and a Tecumseh. Almost threw them out 2 weeks ago - knew they would come in handy.
Thanks
Tyler