Emailed Jon and reply is as follows (in case anybody else needs same info!)........"The NGK BPR5ES is normal for the Pro but I run a BPR5EIX in mine. It's a much better plug and
worth the added expense. Set the gap at .6mm (.024"). The previous owner probably did not check
the gap before installing the plug.
Assuming you're near sea level, the jetting should be in the neighborhood of:
Main-107
Pilot-S36 or better, S38
Needle-D48 with clip on 2nd groove from top
Fuel screw- start at 3.5 turns out
Check float height, float should parallel with sealing surface on carb body
The Dellorto flatslide was only used on the 2003 Pro. Set your fuel screw
each time you ride to get the maximum response. Blip the throttle open and
closed quickly to check response and open/close fuel screw to give the best
pickup response."