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Message: [QUOTE="BigR, post: 145019, member: 21097"] I have a 01 CR250. I'm going with the recommendation of trying the s7 nozzle instead of the s9. My current jetting is 410 main H2-74 needle 1st position (top clip) 30 pilot AS 2 turns out I understand that each one of those affects a certain throttle opening. What range of throttle does the nozzle effect? What changes to my current jetting might I need to make after changing to the new nozzle? The area I ride is Sacramento, CA. Mostly at the Hangtown track. So low elev. and hot (90-100). Thanks [/QUOTE]