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Description
4229 122 6200 STIHL Idle Speed Screw – Genuine OEM Carburetor Part
The STIHL Idle Speed Screw (4229 122 6200) is a genuine OEM carburetor adjustment component designed to restore proper idle speed control and stable engine performance across a wide range of STIHL handheld equipment. This screw plays a critical role inside the carburetor by setting the throttle stop position, ensuring the engine maintains correct idle RPM.
Over time, idle speed screws can become worn, stripped, bent, or corroded due to vibration, repeated adjustments, or servicing. A damaged idle screw may cause rough idle, stalling, or cutting attachments spinning at idle. Replacing it with the correct OEM part helps restore proper carburetor calibration without replacing the entire carburetor assembly.
Manufactured to STIHL factory specifications, this genuine idle speed screw ensures correct fitment, smooth adjustment, and long-term durability under professional operating conditions.
Product Details
OEM Part Number: 4229 122 6200
Brand: STIHL (Genuine OEM)
Part Type: Idle Speed Screw
Application: Carburetor throttle stop / idle adjustment system
Condition: New Genuine OEM Part
Function
This STIHL idle speed screw is designed to:
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Control and stabilize engine idle RPM
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Set throttle plate stop position inside the carburetor
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Prevent clutch engagement at idle
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Improve throttle response and idle consistency
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Replace worn or stripped adjustment screws
⚠️ A failing idle speed screw can cause stalling, unstable idle, or attachments moving while idling.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4229 122 6200
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Your carburetor model matches those listed below
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Application matches your STIHL illustrated parts diagram
⚠️ Idle adjustment screws are carburetor-specific — always verify by OEM part number and carburetor type.
Compatibility
This OEM idle speed screw fits many STIHL carburetors used across blowers, trimmers, hedge trimmers, Kombi units, chainsaws, and cut-off machines, including:
Blowers / Shredder Vac Units
BG 45 / BG 45 C KAT (C1Q-S112)
BG 46 / BG 46 C KAT / BG 46-D (C1Q-S112)
BG 50 (Carburetor 4229/12)
BG 55 / BG 55 C KAT (C1Q-S64)
BG 65 / BG 65-D (C1Q-S64)
BG 85 / BG 85-D / BG 85 C KAT (C1Q-S64)
BR 45 C (C1Q-S73)
BR 350 (C1Q-S220 / C1Q-S199)
BR 430 / BR 450 / BR 450 C-EF (Carburetor 4244/11)
SH 55 / SH 85 / SH 85-D (C1Q-S64)
Trimmers / Brushcutters / Kombi Units
FS 45 / FS 45 C-E / FS 45 D (C1Q-S71)
FS 46 / FS 46-D / FS 46 C-E / FS 46 C-E D (C1Q-S71)
FS 55 / FS 55 R / FS 55 R-D / FS 55-D (C1Q-S66 / C1Q-S71)
FS 75 / FS 80 / FS 80 R 4137 (C1Q-S63 / C1Q-S78)
FS 85 / FS 85 R / FS 85 RX (C1Q-S63 / C1Q-S78)
FC 55 / FC 55-D (C1Q-S71)
FC 75 / FC 85 (C1Q-S63)
KM 55 R / KM 55 R-D / KM 55 RC-E / KM 55 RC-E D
KM 85 R
KW 85
Hedge Trimmers / Pole Pruners
HS 45 (C1Q-S169 / C1Q-S170 / C1Q-S70 / C1Q-S150)
HL 45 / HL 45-D (C1Q-S71)
HL 75 / HL 75 K (C1Q-S63)
HT 70 / HT 75 (C1Q-S63)
Chainsaws
MS 192 T (C1Q-S257 / C1Q-S134 / C1Q-S103)
MS 192 TC-E (C1Q-S257 / C1Q-S134 / C1Q-S103)
MS 192 C-E (C1Q-S259 / C1Q-S124)
Cut-Off Machines
TS 410 / TS 410-A (Carburetor 4238/05)
TS 420 / TS 420-A (C1Q-S118 / C1Q-167)
TS 440-A (C1Q-S118H)
Other Equipment
BT 45 (C1Q-S74)
MM 55 (C1Q-S79)
SR 430 / SR 450 (Carburetor 4244/11)
(Exact fitment depends on carburetor type and production version — always verify using OEM parts diagram.)
Installation Notes
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Locate idle adjustment screw on carburetor body
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Replace screw carefully to avoid thread damage
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Warm engine before adjustment
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Turn clockwise to increase idle RPM
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Turn counterclockwise to decrease idle RPM
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Adjust according to STIHL factory specifications
⚠️ Carburetor adjustments should be performed by a qualified technician.
Maintenance Tips
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Inspect idle adjustment screws during carburetor service
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Avoid over-tightening to prevent stripped threads
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Keep carburetor clean for accurate adjustment
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Always use genuine STIHL OEM components for proper calibration
