Cheers again, seen an old fan to use some fibreglass on, a strip down each blade and then a few strips wrapped round the rear of the fan hub as i think there's a shoulder to stick it to, reinforcing the body. Gonna get the rad off tomorrow as i got some 2inx2inx10guage galvanised mesh to make a screen between the fan and rear of the radiator, if there is enough room i'll put another in and stagger the squares. Hold them in with some ali mig wire if i can drill some 2mm holes in the back of the rad. Check valves again with my new Teng feeler guage and adjust the cam chain. My boss asked "why did'nt you get a new bike?" I replied " because you can't work on most new bikes, and old ones have soul!" they think i'm mad! Well all part of the learning experience.
If it ain't broke, fix it til it is!