Proline® performance cylinder piston kit 49mm for Stihl standard bore size for MS390, 039 and big bore for 029 MS290, MS310. Please compare your existing part with ours to verify proper fitment; actual product pictures are shown. This kit is not made in China.
⚠️ IMPORTANT INSTALLATION NOTES:
1. Cylinder Mounting Screws: This cylinder has machine-threaded mounting holes. Two installation options are available:
- Use the included machine screws: Threadlocker is highly recommended when installing the included screws.
- Use self-tapping screws: You may reuse your original OEM self-tapping screws if they are in good condition or use new self-tapping screws. These screws will cut through/override the existing machine threads during installation.
2. 2019 Models – Muffler Fitment: The muffler bolt slots MUST be filed larger to achieve proper fitment.
Includes:
- Cylinder
- Piston
- Piston rings
- Circlips
- Wrist pin
- Engine pan
- Screw (4pcs)
⚠️ PRODUCT APPEARANCE:
Cylinder color may vary from the pictures shown. Color variation does not affect fitment or performance.
Specs:
- 49mm
-
Proline® Performance Series
- Standard bore size for 039 and MS390
- Big bore for 029, MS290, and MS310
- Nikasil plated
- With decompression hole
- Requires silicone sealant for assembly. We recommend Dirko HT
Replaces Stihl OEM #:
- 1127 020 1216, 11270201216