PZ20 Carburator
Although everyone has suggested the VM22 unless you change the intake manifold you wont get more than 20mm anyway so i went with this $13 carb from amazon it is adjustable and has cheap jet kits available, but right out of the box with a slight adjustment to air/fuel screw it has added power and eliminated the bogging the factory carb would do at times.
https://www.amazon.com/dp/B07NTX9X57...p_mob_ap_share