yes the high speed needle,well it was just a thaught because when i was just learning and yes i am still learning my mt2 felt like it was loosing power when i was at full throttle i opened carb bit at a time or close which ever the case and havent had a problem since some people find it hard to tune but all you have to do is observe by trial and error and learn the prinsiples of the carb setting at the time you are running.only my thaughts and oppinions that all .