Home/SPARE PARTS
  •   Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 1
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 2
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 3
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 4
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 5
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 6
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 7
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 8
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 9
      Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221 10

    Cylinder kit for STIHL FS120 2-MIX and FS120 R 2-MIX trimmers 4134 020 1221

    Inquire about this item
    59.99 €
    In stock.

  • This STIHL FS120 2-MIX cylinder kit – a non-original 35 mm cylinder and piston kit, designed for STIHL FS120 2-MIX and FS120 R 2-MIX brushcutters that use the original cylinder number 4134 020 1221.

    In the 2017 STIHL parts catalog, 4134 020 1221 is listed as a 35 mm cylinder with piston, specifically for:

    STIHL FS120 2-MIX
    STIHL FS120 R 2-MIX

    This is not the regular, non-2-MIX FS120 cylinder.

    Fits
    STIHL FS120 2-MIX
    STIHL FS120 R 2-MIX

    Original cylinder number:

    4134 020 1221
    4134-020-1221
    41340201221

    Cylinder diameter:

    35 mm
    Original parts numbers for version 4134 020 1221

    In the STIHL catalog for this engine/version it is specified:

    Cylinder with piston – 4134 020 1221
    35 mm piston – 4134 030 2017
    35 × 1,2 mm piston rings – 4134 034 3003
    Piston pin 10 × 6,5 × 23 mm – 1139 034 1500
    Piston retaining rings – 9463 650 1000
    Cylinder base gasket – 4134 029 2301
    Needle bearing 10 × 13 × 12,5 mm – 9512 003 2250

    These numbers are useful for checking which engine version is disassembled. They are original STIHL engine part numbers and do not mean that all individually listed parts are automatically included in this non-original kit.

    Important: Only for 2-MIX version

    This cylinder does not fit the regular STIHL FS120 or FS120 R without the 2-MIX engine.

    In the same STIHL catalog the regular FS120 / FS120 R has a different cylinder and piston version. 4134 020 1221 is specifically for FS120 2-MIX and FS120 R 2-MIX.

    There is also a later factory version. In the 2019 STIHL catalog, FS120 2-MIX and FS120 R 2-MIX are listed with the 4134 020 1222 35 mm cylinder, together with a different piston 4134 030 2023 and rings 4149 034 3005.

    Therefore this item is specifically the 4134 020 1221 version. If repairing a later brushcutter, before purchasing you should check which cylinder and piston version it uses. Do not blindly mix piston and ring numbers between versions 1221 and 1222.

    What to Check Before Installing

    If the old piston is heavily scored or seized, you must first find the cause of the failure. Check:

    Carburetor adjustment and fuel supply
    Fuel filter and hoses
    Intake system sealing
    Crankshaft seals
    The gasoline and two-stroke oil mixture used
    Engine cooling

    An engine running too lean can very quickly damage a new cylinder.

    When installing, check the connecting rod and the upper needle bearing. Lightly lubricate the piston, rings and cylinder wall with clean two-stroke engine oil. The rings must rest against their locating pins, and the piston must be installed in the correct direction.

    Use the correct cylinder base gasket and tighten the cylinder bolts according to STIHL technical requirements.