Thanks mate , I've started doing some home work, there's plenty of kx 250f/450f wrecks 06-09 around , ( that's the good thing about 4 strokes) I found a step by step conversion for 2008 kx 250/450f , that's a big incentive

, from what I've read on the 04/05 250f conversions there's a few issues to overcome , , there's also the incentive of the af frame on 07-09 , where as the 04/05 is steel
Ah that's right, I keep forgetting about that.
I know a guy who has done a few conversions more then me and he really likes the 04-05 conversions.
They are easy to do and the bikes handle great.