I just bought my first bike, a Honda Rebel, and I love it. One thing that I have heard and that I'm afraid of is that I am going to "grow out of it" fairly quick as I will want more power. I love riding it, but I can see that there will be a point when my comfort level allows me to want more power. I love the fuel efficiency and agility of the bike, so what can I do to get more punch out of the bike without replacing every part? I can handle a little sweat and grease so hit me.