Ive recently bought a lovely 1999 bultaco/sherco trials bike. unfortunately the previous owner tried to disguise it as a 2002 sherco 290 and made a terrible job of it so i am currently trying to restore it to its original condition. Im just not sure on the engine size. Also i was wondering how to change the oil? and finally the access to the radiator cap is almost impossible and i wanted to get in to top up the water and coolant but it seems almost impossible to gain access as the electrics are obstructing the filler cap. Any kind of help would be appreciated as i am keen to get this bike back to running and riding condition asap. thanks.