I recently restored a go-kart for our grandkids and made the mistake of buying an inexpensive imported carb (not from Jacks) for the karts's 5hp engine. MISTAKE. The import had a steel fuel bowl and rusted from the inside out causing reliability issues. This carb from Jacks was a perfect OEM fit and has an aluminum fuel bowl. After bolting it on and connecting the linkages the engine started right up. No adjustments were required. The grandkids are having fun again on their go-kart.