+1 for carb sync making a difference. I found my Avenger II was WAY out of sync on Sunday, so I got it all tweaked out. Starts easier, smoother operation, shifts nicer, a bit quieter (not as much clatter), and I hope to see the mileage pick up a bit as well. My bike is a Honda Shadow, so sync'ing 2 carbs is a lot easier than 4. But I lose the "cool" ness of the inline 4.
Here's the trick for the Honda 4s:
work on cylinders 3 and 4, and get them to line up.
work on cylinders 1 and 2, and get them to line up.
THEN, balance between 3&4 and 1&2.
I did verify this with an older Honda mechanic.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.