Right, Many thank you's for all the ideas and advice guys Lots of cleaning, soaking and warming up eventualy got the pipes out of the spare crankcases, gsx600f ones i believe. The 650 Bandit ones were a pig. The whole one came out, eventually, by the usual methods .. The rotten one broke almost instantly. However this may have been a blessing as i was able to weld a piece of metal to what was left and use a slide hammer to pull it out .. Pretty much a whole days work but done now ..