New Carb ( which one )

I am thinking of updating the carburettor on my Li125 Silver special (175cc barrel and piston)
The current Carb is the standard SH1 20, 20ml but it needs updating as it's pretty old and struggling a touch, any ideas as to what would be a good replacement ?
cheers in advance
The current Carb is the standard SH1 20, 20ml but it needs updating as it's pretty old and struggling a touch, any ideas as to what would be a good replacement ?
