Primer bulb. The primer bulb draws fuel into the carburetor to make the engine easier to start.
Walbro primer bulb. The primer bulb draws additional fuel into the carburetor to make the engine easier to start. If the primer bulb is leaking, replace it.
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.
Zama rb-k75 carburetor
Zama rb-184 rebuild kit
Walbro k13-wyk carburetor repair kit
Needle kit jet