The few bucks option as in a new stock carb has already been tried. $70 or so for the 18mm mukini I found. (have not bought yet) I will try the polish technique, Never thought of that. I may also loosen the magnito and see if I can move it a little to advance the timing a degree or two. I know there is some play there because I had an engine apart B-4 to replace a failed crank bearing. I know this bike will do it because max speed recorded on the speedo is 33.6mph. Good tips, THANKS!!!