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Stihl Chainsaw | 029 039 MS290 MS310 MS390 |
Compatible for | Stens 615-743, Walbro HD-19 HD-19-1 HD-19B, Stihl 1127 120 0650 |
● Drain screw: used to drain the fuel out of the carburetor.
● Idle mixture screw: controls the intake of fuel to adjust the engine for optimum running.
● Idle speed screw: controls the intake of air to adjust the engine’s idle speed.
● High-speed screw: adjustment for high speed.
● Low-speed screw: adjustment for low speed.
● Turn clockwise to decrease the RPM (revolutions per minute) while turning counterclockwise is for increasing the RPM. The amplitude for each adjustment is 1/4 turn.
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