Hi andy, seen you lurking and now youve popped in from the cold...greetings
Ive found one...its the only one left in the world Here ....Yep its expensive and no I wouldnt pay it but it does give you the part number so save it as a search on ebay and see if another comes along, alternatively engines or part engines come along now and again so maybe cou could watch out for them. another alternative is maybe get yours re-wound, I dont have experience with this but i would give west country winding a ring and have a chat about it 01279 731172. www.westcountrywindings.co.uk Have you tried Granby or Fowlers for genuine yamaha spares?
...Paul