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Description
4149 030 2012 STIHL Piston Ø 35 mm – Genuine OEM Part
The STIHL Piston Ø 35 mm (4149 030 2012) is a genuine OEM engine piston designed for use in select STIHL trimmers, Kombi tools, and hedge trimmers (serial number ranges apply).
This piston is a critical internal engine component that compresses the fuel/air mixture and transfers combustion power to the crankshaft. Replacing a scored, worn, seized, or damaged piston helps restore compression, power output, and reliable engine operation.
Manufactured to STIHL factory specifications, this OEM piston provides correct diameter, proper fitment, and long-lasting durability.
Product Details
OEM Part Number: 4149 030 2012
Brand: STIHL (Genuine OEM)
Part Type: Piston
Size: Ø 35 mm
Application: Engine / Cylinder Assembly (varies by model)
Condition: New Genuine OEM Part
Function
This OEM piston is designed to:
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Restore engine compression and combustion performance
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Transfer power from combustion to the crankshaft
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Replace scored, worn, seized, or damaged pistons
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Improve starting, power, and throttle response
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Support proper engine reliability after top-end rebuild
⚠️ A damaged piston can cause low compression, hard starting, loss of power, excessive heat, and complete engine failure.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4149 030 2012
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Piston diameter Ø 35 mm
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Your STIHL model is listed below
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Your machine serial number matches the range shown
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Part location matches your engine / cylinder diagram
⚠️ Always verify fitment by OEM part number, piston size, and serial number for best accuracy.
Compatibility (Fits STIHL Models)
(Serial number range applies)
Hedge Trimmers / Long-Reach Units
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HL 91 K (Engine from serial number 516095589)
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HL 94 (Engine up to serial number 514368761)
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HL 94 K (Engine up to serial number 514368761)
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HL 94 KC-E (Engine up to serial number 514368761)
Trimmers / Brushcutters
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FS 94 R (Engine up to serial number 514309587)
Kombi Tools
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KM 94 R (Engine up to serial number 514291126)
Installation Notes
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Turn off engine and allow it to cool completely
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Remove cylinder and inspect cylinder wall for scoring
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Remove old piston and wrist pin components
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Install STIHL OEM piston Ø 35 mm 4149 030 2012
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Ensure piston ring orientation is correct and ring end gaps are positioned properly
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Reassemble cylinder and torque fasteners evenly to OEM specification
⚠️ Always inspect the cylinder for damage. Installing a new piston in a scored cylinder can cause rapid failure.
Maintenance Tips
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Use fresh fuel mix with correct oil ratio
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Keep air filter clean to prevent dirt ingestion
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Avoid running with air leaks (intake boot, gaskets, seals)
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Replace piston rings if needed during rebuild
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Use genuine STIHL OEM pistons for correct fit, balance, and durability
