The carb linkage on the tranny side of my bike is sticking in the loweset RPM position. It freezes up in a day or so.. If you put WD 40 on it and work it by hand --it frees up some, but is still slow to close. I thought it was a rusty spring. I went to the local Yamaha dealar with a closeup photo. He says it is not the spring, but the cam or shsft the linkeage moves on. The dealer does not have a part-discontinued. Do you agree with his assessment. Any help is appreciated. Thanks