Brilliant, thanks. Looks like it will be my little project for the winter!

Thanks both Al and zed1015, that has been a great help. One final question , I am presuming from the catalogue and the picture of zed1015's bike that the RPK3190 is designed to run with no outer cover. Is this correct?

Thanks zed1050. Every day is a school day as they say. I've been looking for ways to go faster without putting anymore stress on the 1260 motor, hence the quickshifter, plus ceramic bearings, non o-ring chain, losing dust seals, etc to reduce chassis friction. The alternator mod looks like my next t...

Thanks Al, running a standard alternator but also have a healtech electronic quickshifter so revs don't really drop between shifts. Sounds like something I should look into for next season.

This has been a very interesting read, thank you all. I run a 1975 Z1B based engine in my sprint bike and have no electric starter as my battery is too small to run one. I rely on the old fashioned kick start. Do people think that one of these systems would be beneficial in sprinting and if so does ...