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Message: [QUOTE="NOTTIES, post: 1321570, member: 80133"] I have just completed my project: 1993 KDX250 rebuild. I see on your site many of the riders suggests a pilot jet of 38-42 and a main jet of 155-158. I currently have a 38 pilot installed and a 150 main jet. Jet needle 1368. Needle clip 2nd from top. Have a FMF header pipe. Standard reed valves. B8ES spark plug. I did not run the bike yet(waiting for front caliper). Will then do the plug tests etc. I would like to know if the extra leaner main jet will have the risk of letting the bike run too hot or cause any other damage? Did anybody try the 150 option? Will a 155 main jet be a safer option? [/QUOTE]