View Full Version : main jet 2008 rs125

12-29-2008, 06:37 PM
just put a single can j&l exhaust on my rs, filter is standard, i`ve blocked the tube to my filter from my standard exhaust, the carb is a phbh 28 bd which has a 128 main jet, can anyone recommend the correct jet size? It is running very lean with the standard jet but goes like a rocket straight past 12000 rpm but can`t run it like this as i think she will blow! The plug is slightly off white when i done a plug chop, can anyone help? :)

12-30-2008, 07:47 PM
Heres a complete deristriction guide for your bike.