can anyone help me please? my bike runs very well most of the time,but it wont start when its on a gradiant! why does this happen and how can i stop it from happening? it seems to get a bit better when the bike cools down for a while,any ideas please? allso is there anyone who would be able to have a look over it,kinda like a service,just dont trust the shops so much as think they can charge the earth! thanks in advance.