opdeweegh1 thanks alot! that was exactly what i was looking for! i called the guy a tit becuase all i wanted was an answer like yours explaining how to do the job, anyways i found what you have put really really helpful because i now have an insight into what may be wrong with the bike and how to check and fix it!my dad also say thanks alot!your help is much apreciated i will begin sometime this week and tell you how things are going....thanks again for your reply!