Proline® piston rings for Stihl MS391 chainsaws and MS311 models equipped with a 49 mm big-bore cylinder. Compare your original rings and OEM part number before ordering to verify proper fitment. Actual product pictures are shown. Parts are not made in China.
⚠️ FITMENT NOTE: MS311 fits 49 mm big-bore conversions only. Standard MS311 models use a 47 mm piston.
Includes:
- Piston rings (2)
Specs:
- Size: 49mm × 1.2mm
- End gap type: Side pin
- Color: Black
Replaces Stihl OEM #:
- 1140 034 3001, 11400343001