I have a well used 88 xr600 with a third gear problem. good top end, rebult last spring, jetted and a supertrapp. third is jerky feeling so I havent been riding in it just reving hard in second then double clicking into fourth when needed. now there is a nuetral between 3rd and 4th and it wont let me double click past third, goes to neutral. I have to rev it then click it a few times for it to go into 4th.givin the cost of repair im leaning twords a new bike, its hard to put more money into the 600r .