So over the course of the summer, I will be doing some performance upgrading to make my bike into the ultimate freestyle bike. Bottom end is definitely a must in freestyle. I also was thinking about it, and all engines are the same, before you can upgrade the engine, you should definitely try getting the max airflow and exhaust flow before you do anything to the engine. With that said, here is my list. 1.) Twin Air Performance intake kit 2.) Pro circuit ti-4 Exhaust system 3.) Athena 290cc Big bore kit 4.) Stage 2 hot cams I will also be upgrading from my already 50t sprocket to a 52t driven sprocket. If thats too much, ill just go back to 50t, but I still wanted to try it. The biggest problem with the thumpers in freestyle is the quick run-in's to the jumps in arena's. with 2 strokes, they have such godly acceleration to powerband you can hit the jumps so easily just in 2nd gear up to about 70-80 feet. Some run ins are about 35ft to jump 65ft, and with a stock 250f, i will not be accomplishing this. Blake "Bilko" Williams uses a 302 big bore kit on his crf250, so I wanted to get this done before not too long. And to weed out the comments about it, no, it isnt wise to just save the money and buy a 450. There is no point in adding weight and bulkiness, that cons of the 450 in freestyle cancel out the pros. By this, I mean yes, you do get that extra power, but the bike is so big, with much more engine brake in the air [the biggest problem]. So thats my post. Any comments on my upgrades list? edit: Does anyone know if the washer trick still works on the clutch bolts? to make it so you can kick it over in gear? or just go and buy 6 new clutch springs or was this all just for the 01-03 bikes?