I am not sure if this is the actuator arm seal or the crank seal. My bike isnt running lean its actually running a bit rich. I also have another issue which i think its the reeds because when i get up to the rpms like 5th gear its if my rpms throttle and feels like theres no more power after half throttle i've read online its the reeds. I just rejetted the carb but I haven't looked at the reeds yet. I also rebuilt the piston recently and there was no up and down movement on the crank.