I just bought a 2003 CRF150F for $700. When I bought it, I did notice the brakes were weak. And I did feel like it could start easier. So, here's what I did. Replaced spark plug with .035 Gap. Replaced front and rear brakes. Changed oil. My question is, is it good to hit the trails? Seems like everything is solid. Brakes work excellent now and it starts on first kick. Also, I did notice the front engine sprocket feels kinda loose. Is this common? Does it need to be replaced? Thanks.