Primer bulb. The primer bulb draws fuel into the carburetor to make the engine easier to start.
Zama carburetor rebuild/repair kit. If the carburetor is clogged, the engine won't get enough fuel. As a result, the engine may not start or may run rough. It is often possible to repair the carburetor if it is clogged.
Needle, low speed
High speed needle
Needle, high speed