Thanx guys. It's my off weekend so I will spend time this weekend and get back to you on Monday. One thing julien_d, howcome 160/48 is to rich if the bike is at sealevel? Surely that is the jetting the manufacturer suggests at sealevel. I'm new to this site and is actually quering this for a guys bike in town. I competed in competitions in Namibia 1993-1997 and of the last 4 years with a brand new KDX, so I had no problems. Bought a KDX brand new 6 months ago. This guy have been struggling with this 2004 KDX and I would like to help them. I thank you guys in advance for assisting me. I'll get back to you on Monday. What a great site with friends/supporters like you guys! By the way, I'm actually Afrikaans, so excuse the spelling!