Great improvement when used with exhaust and or big bore kits. You do need a bigger manifold and 48mm air filter
30mm carb with manual accl pump. use this carb when upgrading a 150cc or 250cc scooter or GO Cart using the GY6 150 engine along with a chrome intake or teflon coated manifold which is larger plus add a high performance air filter. This will get the right amount of air and gas in to get an cylinder upgrade or exhaust upgrade to the power and speed.
The 30mm carb is alo an upgrade for better performance for most 150 and 250cc scooters and go carts that might have vaccum only pump or just not getting the gas it needs. Get this carb get rid of air box you have and let er go.
We also have lots of different air filters for scooters and carbs, some are tappered to fit in the tight places these carbs have to fit. We have installed on several different scooters and go carts with great results. Just plain better than stock carbs that come with scooters and go carts.