I found this helpful article and thought I’d share. It includes good links to how to identify different types of jets, carbs, etc.:
A Little background
Many will look at jetting charts and infer from it the jet which is affecting carburetor circuit. For example at wide open throttle the engine runs poorly, according to a jetting chart the jet to adjust is the main jet. Since the pilot/slow jet is supplying fuel at wide open throttle, it may be the problem, therefore we always recomend starting with the slow/pilot jet.
Rejetting can be confusing so let’s keep it simple, do not change more than 1 thing at a time. For example don’t change the pilot jet, move the needle clip and change the main jet. If more than one item is changed no determination can be made as to which thing caused the result.
Read the full article at: http://www.jetsrus.com/FAQs/FAQ_rejetting_101_how_to_rejet.htm