i just bought this bike 3 days ago from the origional owner. it has 16000 miles on it and sat for 10 years. i changed all the fluids and cleaned the gas tank as well. the problem im having is when i am in 5th gear on the freeway,it bogs from 50 to 65mph until it hits 70 then it takes off. I think the carbs need to be synced and cleaned! can anyone help?