After riding 200 miles on my recent purchase of a 2003 classic, I noticed a lot of backfire. I did a shim check and the intake is within tolerance ( .1 ) but the exhaust is at 0. I checked the front cyl only as its running much colder than the rear. The bike has V&H exhaust without baffles. My concern is that since I don't know how long it has been running without baffles that the exhaust valves are burnt. Finding a good mechanic here (Dominican Republic) is like finding a needle in a haystack. On top of that you can't leave your bike in the shops here. Most work is done on the streets. This means if I want to see the valve seat I will have to pay to have it torn down then reassambled. From what I see I have 3 options. Reshim and pray the valves are good, buy new exhaust valves and pray the seats are good, or buy used Cyl head assy.