Hei i come from denmark and my dad have one of these baike.. he hadn´t been driving it for 18 years or so.. then he tried it on a farm, but after some time it could not start again when you was kickstarting it. the stamp glides really fast in the cyllinder, there is no press and it dosn´t start:-( can you helt me? maybe you know what it is then, how much is the diameter of the stamp? tank you