Hi new to the forum have spent awhile looking for answers but can't find a definitive. Just bought a 320 sherco registered 57 pl ate has a Pwk carb, it bogs when throttle opens quickly either in neutral or when asking to lift the front end without clutch. Have just ultrasonic cleaned the carb and jets then blown thru with air. No difference. Does any body know the factory jetting sizes and needle position. Any help appreciated