Hory Clap! 1/8" Washers! (0.125")Midrange carburetion is controlled by the needle. Adjusting the idle screws won't change midrange leanness.
All you have to do is remove the fuel tank and you can remove the carb tops, remove the needles, place 1/8" thick plastic washers in the needle seats and replace the needles.
You can see if there's a Holeshot jet kit. But the washer fix is really quick and simple and might just do the trick.
More like 0.030" (vaguely 1/32" or ~0.8mm) to 0.035" thick washers, MAX I'd say.
Try a #6 or #8 washer, if you can't find metric that'll fit..............