Okay, everything else being equal (timing good, filters cleaned, new plugs... etc...) what would make a bike run richer and richer over time? I'm talking over a couple of years here with no changes to the set up. Visably running richer according to the plugs (and exhaust) and gas milage dropping by about 5-10 miles per gallon?
The Basics: Ducati 750 V-twin. K&N Air filter (stock air box) and race (glass pack) pipes. It has been this set up since early 2001 when I was getting 50+ MPG. Now I am getting just over 40 and the plugs (which I change often) are showing that it is running rich. What should I be looking for?
Granted this isn't a SOHC honda question... Heck, it isn't even Japanese. It's just a quesiton that I have for those out there who are knowledgeable in such matters.
