My '03 with 3000 miles on it (pretty sure factory carb setup when I bought it) came with 38/138 jets and factory sealed 1 5/8 turned out air screws. Did earshave with stock exhaust running 38/142 with 2 shims and air screws 2 1/2 turns out. Made bike too lean even with air screws later backed out to 3 1/2 turns and the pipes got a bit yellowed with chalky white plugs so after 500 miles swapped the slow jet to a 42. Pipe yellowing stopped. After 10,000+ miles plugs are a bit dark. Have ordered 140 mains and plan to swap in the next few weeks.
For my bike I suspect 40 or 42 slow jets and 140 mains with 2 shims is the way to go with a stock exhaust.
Update: Got a few thousand miles with the 40/140 setup (2 shims) and plugs look about right, great throttle response. I'll probably remove 1 shim just to see how she runs next time I pull the carbs.
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Last edited by Spencer1; 06-15-2014 at 06:47 PM.