What can I say, This is my second review on this and here are my final thoughts, I paired this kit with a YX 160 jug and a 60mm piston on a 2003 DR-Z 110 with a 3 inch extended swing arm, inverted forks, 17/14 inch front/rear wheel with disk brake conversion, Mod stock exhaust, VM26mm Molkt carburetor with a 17.5 pilot/ 22 main jet with stock head and valve train. I was having issues getting it started for a while but once I got the carburetor tuned it runs Awesome!!! I took it out for a ride today and did not expect so much power to come from this mod. I started going and I tapped the gas and she come straight up and took off on me. I am okay for now but do be safe if you add this kit.(NO Playing Around. lol) You should give yourself time to get use to the upgrade. It is just all out a great kit.