Finally, I came across the Athena big bore kit and it works! The first thing you will notice when you open the kit is the high quality. The kit comes with everything you need to bolt it right on, except for jets. We ended up switching from the stock 190 main to a 210 and the stock 25 pilot to a 27.5. This is with the stock pipe, at 60 degrees, at sea level, using 32:1 gas and oil. The kit isn't any harder to install than doing a regular top end job, so as long as you have a Kawasaki service manual in hand, you can get the job done.You wouldn't think that adding 15cc to a KX 65 would make such a huge difference, but it does! From the moment I started the bike, you could tell it meant business. It had a bark right off the bottom that was amazing. I hardly even have to hit the clutch anymore to keep the RPMs up. The great part is the bike revs up just as high as the stocker, but pulls so hard on the bottom that you can lug the motor around on the tightest trails or tricky sections of the track. Everyone from beginners to pros are going to love the super wide power spread.