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Message: [QUOTE="HiG4s, post: 157644, member: 22165"] Factory stock is 400/35 Which is what I'm still running on my 99 CR125, but I do have a PC pipe. I run 40 to 1 with Honda synthetic oil and it runs pretty well. 390/30 would be one step leaner than stock on both jets, mainly for hot temps at sea level like here in FL. Higher altitudes may need to be leaner. I have a 390 but the 30 is back ordered and I want to change that first as it seems to run good up top but hesatates a little down low. If you have a fax machine I can fax you the jetting chart and carb parts pics from my shop manual. [/QUOTE]