The place to come to share your technical expertise, or just find out what the little springy thing is that's just pinged out of sight under the work-bench.
Thank you Stig. That pretty much answers my question. I am looking to buy a clutch housing from as late a bike as possible so that I can save it for the future. The top end of my motor is really good, zero smoke, so I think it worth investing in decent components along the way.