WOW Eric Gorr seems to be the man around here!! Sounds like the .080 pistons are in such demand, I think I will go for the 133cc .060 I think that's the piston size :think ? Anyways, I have a 99CR125 and it rips plenty for me, I already have the FMF Fatty Pipe (Eric's website says FMF's Fatty Pipes are excellent for bikes that have been bored out), I also have the PowerCoreII Silencer, with Boyesen CF Reeds and RAD Valve. I want to get my bike punched out to a 133cc. Also over the winter, I plan on buying a 250cc carburetor for it. Because in Eric's website, he says for more power, the 99CR125 has the bigger airboot, but still needs the larger carburetor. I have a 99CR125, so should I buy the 99250 carburetor for it? If not, what's the best year for it and will it fit on my reed cage at all since my bike is a 125?? I'm really not an expert at this, but to anyone who reads this, can you share some helpful info about this topic at all? Thanks guys and keep on roosting!!