All good suggestions on the mods but consider this: sandpaper, polish, sawblades. rivets, aren't completely free unless you already have it all sitting around the garage. For $25 you can get a 16t front sprocket, borrow the tools from a friend if you need to, do the work yourself, and have a mod you can really feel for practically nothing. I get where your at with $. I mod, fabricate, and handmake everything I possibly can even my own drag race exhaust (not on the bike in this pic). After that I shop for used parts I can get cheap. I got less than $6000 in this one so far including cost of the bike.