For you guys in the UK: https://www.gpxmotouk.com/shop-gpx.html They have the parts to convert the DTR to 230cc, can probably get the complete engine too. If I was thinking of a engine rebuild and/or Athena 170, I would go for this instead, based on what I learned from the Athena 170 kit.

Cheers buddy, I'd searched and just turned up gibberish that confused me even more, but once I ignored all the threads claiming the pulley rotates clockwise for PV opening, and set the cables back as they were supposed to be (1-2, 2-1) it all made sense again - it must turn anticlockwise viewed from the LHS to open it couldn't work the other way! Anyhow, it's all up and running and I've fully re-dressed her and given her a wipe over and a run up and down the road. All seems well enough but it feels like the PV opened more and earlier before I tore it down and serviced it, I think it had been adjusted from the normal peg-in-hole alignment perhaps, but it's al good enough for now and if I want to tune it a bit differently for preference at least I know what I'm doing now! Time to ride it some more whilst I think about sorting my carb tune properly down the line. Cheers Calum!

Thanks Calum.