...because they will, when there is no petrol to feed them! Anyway...i find it funny that so many hours- nay- days can be spent stripping and cleaning our lovely old bikes, knowing that bearings can be pulled apart and re-greased, every nut and bolt we have removed is greased before being put back, everything is adjusted just so- in fact these bikes are better than new- but...i know i am...so reluctant to ever get them dirty again....! But at least we have them, and they are good, and when the cars die they will all come into their own and proudly come out from the dark! Yeah, ok, had a hard day off work and building the Rockhopper(94) back up and had a glass or three of merlot....hic.