i and all my mates get our parts through Scotty's Dirtbike Spares in Ringwood, Victoria. He sells Gasser's and parts for them but he'll get anything in for any othe rbike. he got valve specs for my dad's 1989 Yamaha TT250 and bits for one of ym uncles' 07 WR450f's. this may be good to know if your in Vic, i think he may post stuff though. his web address is
www.scottysdirtbikespares.com