HEY BOO!! the carb is just set up a lil larger on jets and discharge nozzles for the larger cid...your not going to automaticly pick up performance with a lil larger carb...you might have a fuel prob. on the plugs if there is to much gas. which would also not help with the lil stumble you have ..i would get the heat on it working for the better warm up though and keep an eye on the plugs for to much gas ...(loading up)blackish !! the plug should run a light tan color to be correct..you might even think about a lil carb spacer 1"..this will take a lil low end off but should help lean the carb out some...hope that this helps....regards.....gary
