Just a handy little carburetor jet calculator for Honda motorcycles I stumbled across while doing some surfing around the interwebs. You pick your bike (bunch of Honda and Kawasaki models available), air cleaner, pipes, elevation, etc and it creates a kit which includes the main and pilot jets you need for your setup.

Here is a direct link for the calculator for Honda VT750C VT750CD Shadow (Aero Spirit Ace Deluxe) 1998-2003.

For the 1999 Honda Shadow the stock front main jet is a #105 and the rear main jet #110. The stock pilot jet is a #40 for the both the front and rear.