http://www.ebay.co.uk/itm/MONTESA-COTA-247-FRONT-EXHAUST-HEADER-PIPE-21M-/121153516402?pt=UK_Motorcycle_Parts_13&hash=item1c354ff372
i dont have a 247 but it looks like the rubber joint holds the two pipes together
a 2 stroke will smoke when its not been run for a long time