- Feb 25, 2006
Hello, I have a 1999 yz 125 with a pc pipe and silencer and an athena works kit (with the removable dome). Right now the jetting is pretty close with the stock reeds. The suggestions that come with the rad valve say to go 2-4 sizes leaner on the main. I would just like to know what people have done to get their bikes running well after putting one in. My main concern is going to lean and damaging the top end. Any input would be greatly appreciated.