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Message: [QUOTE="snb73, post: 1220518, member: 49046"] I live in Southern MD, at about 500 feet ASL. I used 93 octane @40:1 with Mobile Racing 2T: Plug = BR8ES Main Jet = 168 Slow Jet = 45 Power Jet = 48 Needle = N8RH @ 3rd Clip Slide = 6.5 I had the same problem you described, from idle to 1/8 throttle the power was predictable but between 1/8-1/4 throttle the power would switch on. Changing the Power Jet from a 50 to the 48 solved most of this. I started using SUNOCO 110 (CAM2 Purple) this made the jetting much easier and alomost completely emliminated my jetting issues. Good luck, Steve. P.S. Since Mo-Better porting and boring to a 265; Fuel = Sunoco 110 @40:1 Mobile Racing 2T Plug = BR8ES Main Jet = 162 Slow Jet = 42 Power Jet = 48 Needle = N8RH @ 4th Clip Slide = 6.5 The Main Jet is very sensitive to air temp now. 168-165 above 70-75* F, and 170-172 below 65* F. Keep in mind this jetting fits me, it may not work for other riding styles. [/QUOTE]