chech you diaphram in you carb, have had a few go hard and also the slide can score and get worn, also on the side of the carb is a round filter with gold mesh in it make sure this is clean, check to see if it has an accelerator pump on the carb and its not just running off the fuel from that, also check your ignition coil, blue in clour right hand side of th frame jst behind inspection cover where your right foot goes, sometimes the lead will go very hard and brittle causing it to break internally causing flatspots and hesitation
m, March 2010