what throttle position are you jetting? i assume you're not wacking it open and dumping the clutch so if it's flat at the bottom richen air screw and/or bigger pilot jet to fix lean at 0-1/4 throttle. if it's lean at full throttle than go to a bigger main jet. if it's lean in the 1/4-3/4 range raise needle.
07 gasgas xc300-94 duc 900ss-86 morini camel (2)-84 IT200-83 IT175-78 guzzi lm1-77 pursang 250-76 morini 3 1/2 strada-76 frankentaco pursang 200-74 frankentaco pursang 200-74 morini 3 1/2 sport-74 mz ts250/0-74 puch 175 (3)-73 can-am 175tnt-71 guzzi frankeneldo-71 ossa Stiletto-70 frankentaco sherpa s(2)-66 morini corsarino(2)-63 morini corsaro + many more