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:
-
Restore engine compression and combustion performance
-
Transfer power from combustion to the crankshaft
-
Replace scored, worn, seized, or damaged pistons
-
Improve starting, power, and throttle response
-
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:
-
OEM part number 4149 030 2012
-
Piston diameter Ø 35 mm
-
Your STIHL model is listed below
-
Your machine serial number matches the range shown
-
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
-
HL 91 K (Engine from serial number 516095589)
-
HL 94 (Engine up to serial number 514368761)
-
HL 94 K (Engine up to serial number 514368761)
-
HL 94 KC-E (Engine up to serial number 514368761)
Trimmers / Brushcutters
-
FS 94 R (Engine up to serial number 514309587)
Kombi Tools
-
KM 94 R (Engine up to serial number 514291126)
Installation Notes
-
Turn off engine and allow it to cool completely
-
Remove cylinder and inspect cylinder wall for scoring
-
Remove old piston and wrist pin components
-
Install STIHL OEM piston Ø 35 mm 4149 030 2012
-
Ensure piston ring orientation is correct and ring end gaps are positioned properly
-
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
-
Use fresh fuel mix with correct oil ratio
-
Keep air filter clean to prevent dirt ingestion
-
Avoid running with air leaks (intake boot, gaskets, seals)
-
Replace piston rings if needed during rebuild
-
Use genuine STIHL OEM pistons for correct fit, balance, and durability
