Welcome Dave, I have no JAP parts at all and as you can imagine are a bit tricky o find. Keep on checking in and be patient as some mebers dont live here all the time so if someone has a spare they just might be able to help. NOw if it was a Victa one, no worries I have a few of those kicking about the place.
Can you post a pic of the rest of the engine to job some meories. You will need to compress the image to post online.