Carburetor float needle valve.
Part number 27536-47
125cc and 165cc models.
Fits all 1948 to 1959 S, ST, STU 125cc 165cc models utilizing the L and L carb.
A common issue if your S , ST, or STU 125 or 165 bike leaks fuel while sitting with petcock in the off position.
Easy fix with a new needle valve!