Excellent Carburetor and a truly vast improvement over the Sheng Wey 20mm and 24mm carbs! I have this carb on a 1971 Honda Z50 K2 that has the TB 88 cc big bore kit and the TB 51 mm crankshaft installed on the original Honda engine along with the TB Performance exhaust. Very crisp throttle response and with the Flex jet installed which i very strongly recommend with this carburetor as it really makes adjusting the idle mixture a snap! I set it at 2 and a half turns out from closed and i did not have to touch it since. Jetting appears to be spot on right out of the box and it runs very strong! Bike was reluctant to start initially but after running it a bit, it starts hot or cold in 1 or 2 kicks but most often starts on first kick.