Posted April 7, 201113 yr hi there just wondered if anyone could help me out i have a yamaha xt125x 2007 reg i have just fitted a full arrow exhaust system but do i have to upjet my carb at all everything else is standard apart from the exhaust if anyone could help me out id be very greatful
June 1, 201113 yr No there is no point up jetting the carb as an exhaust will only add extra 5 - 10 mph if your lucky upper jetting it will just make it drink more petrol .
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