Hi Guys... 
I am from Denmark and found this great forum, where it seems like there is help for everything    
Just bought a Gas Gas 280 03', it is a great bike, but my problem is that i always have been driving MX so dont know so mouch about trials.... 
When i ride it and a bit up in rpm's and ex. on flat ground where it doesen't have to pull (mayby not the right word for it) it has a knocking sound, but not on hills etc. where it pulls. 
If it was all the time and it was an mx bike, i would say the the connecting rod bearing was broke...... 
Is this normal ????? 
Hope you can understand what i am trying to explaine   
Peter / Denmark