Zama Throttle Adjustment Screw for Carburetors

The Zama throttle adjustment screw (TAS), also called a throttle adjust screw, idle speed screw or idle adjustment screw, is a replacement part for Zama carburetors. Zama carburetors are used on many two-cycle outdoor power tools, including string trimmers, leaf blowers, edgers and chainsaws.

Key Features:

• Sets the throttle opening at idle, which controls the engine's idle speed
• Lets you fine-tune idle so a trimmer or chainsaw clutch stays disengaged at idle and the engine runs at a steady speed
• Replaces a worn, damaged or lost screw on a Zama carburetor
• Made by Zama, a long-established carburetor manufacturer for small engines
• Works alongside the L (low-speed) and H (high-speed) mixture needles during carburetor tuning

The throttle adjust screw only changes idle speed. The L and H needles control the fuel mixture. A common tuning sequence is to set the L needle first, then set idle with the TAS screw, and then recheck the L needle. Turn the screw gently and do not over-tighten it, because that can damage the carburetor. A fresh screw helps the engine hold a steady, reliable idle. Choose the child item that matches your carburetor.