What everybody else said, buy the shop manuals and for my 2 cents buy the parts catalog for your bike too, they come in awful handy when you take something apart and need parts or a referance on how things should look or go together. I take a look at the parts catalog before I take something apart and judge weither or not I got the tools and the skill to tackel something, go down to Harley with my parts list with numbers and then I'm all set up to go and rarely end up running back and forth for parts.