Description
Overview:
This is a genuine Stihl cylinder with matching 34 mm bore piston for HS 81 and HS 86 series hedge trimmers. It replaces the engine's top-end components that create compression, helping the machine start reliably and deliver consistent cutting performance. The cylinder and piston are made from robust metal alloys with precision machining for a close fit in the two‐stroke engine. Designed specifically for the Stihl HS 81 and HS 86 ranges, it provides the correct alignment and clearances without modification. The 34 mm (approx. 1.34 inches) size matches the original specification, so it is suitable for restoring power after wear, scoring, or damage to the original cylinder. A practical choice for regular maintenance or a full rebuild of the trimmer's top end.
Key Features:
- Genuine Stihl part for assured compatibility and performance
- 34 mm bore (approx. 1.34 inches) to match original specification
- Direct replacement for HS 81 and HS 86 series; no machining required
- Durable metal construction designed for demanding hedge trimming work
- Precision manufacturing helps restore compression and smooth running
- Good heat dissipation characteristics to support reliable operation
- Helps resolve loss of power, hard starting, or excessive fuel use due to wear
- Suitable for routine top-end refresh when the original cylinder is worn
- Fits R, RC, T and TC variants within the supported model series
Typical Applications:
Used during top-end rebuilds of Stihl HS 81/HS 86 hedge trimmers to replace worn, seized, or scored cylinders and pistons. Ideal when compression has dropped, starting becomes difficult, or cutting performance has declined. Common for professional landscaping, grounds maintenance, and domestic garden care where reliable daily operation is required.
Also known as:
Hedge trimmer cylinder and piston, cylinder kit, barrel and piston, pot and piston, top-end kit, piston and cylinder assembly, 34 mm bore kit for Stihl HS 81/HS 86.
Fits Models:
HS 81, HS 81 R, HS 81 RC, HS 81 T, HS 81 TC, HS 86, HS 86 R, HS 86 T, HS81, HS81R, HS81RC, HS81T, HS81TC, HS86, HS86R, HS86T
Alternate Part Numbers:
4237-020-1201, 42370201201
Product Specifications
| L&S Part No. | 4237 020 1201 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42370201201 |
| Unit of Sale | 1 |
| Applications | HS 81, HS 81 R, HS 81 RC, HS 81 T, HS 81 TC, HS 86, HS 86 R, HS 86 T, HS81, HS81R, HS81RC, HS81T, HS81TC, HS86, HS86R, HS86T |
| Machine Type | Hedgetrimmers |
| Fits Brands | Stihl |
| Fits Models | HS81, HS86 |
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