1st gear problem

86 TRX250 fourtrax. When put into gear it will idle but when you give it gas will either die or go. Think it may be a fuel problem as carburetor was pretty gunked up before i cleaned it. May possibly be cause the tank is rusty (anyone know how to clean them?). Also have done the brake line fly nut up but lever still donesnt engage brakes, any suggestions? would putting a spacer on the cable work?
Cheers

1st gear problem

86 TRX250 fourtrax. When put into gear it will idle but when you give it gas will either die or go. Think it may be a fuel problem as carburetor was pretty gunked up before i cleaned it. May possibly be cause the tank is rusty (anyone know how to clean them?). Also have done the brake line fly nut up but lever still donesnt engage brakes, any suggestions? would putting a spacer on the cable work?
Cheers