I am obsessed with buying a motorcycle for the summer months here at home, and last night i took my friends 98 ninja for a spin around the block and man it was awsome.

what is some basic information about bikes?
im looking in the direction of a Honda CBR 600, it definatly wont be a new one because im just a poor student.

for example:

how many miles is too much for a bike?

how hard are bike engines/parts etc to work on?

are they really that good on gas?

thanks!
-chris