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Comparison
2 models side by side, spec by spec.
Independent reference database. Specs are compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.
Best suited for
Each model's factual fit, from its duty class and key specs — no winner declared.
- Stihl MS 311 Farm & ranch occasional firewood, limbing, fence-line clearing, and storm cleanup (59 cc · 18-in bar)
- Stihl MS 391 Forestry / production felling and bucking larger trunks in sustained professional use (64 cc · 18-in bar)
Specs verified against the manufacturer spec sheet on — stihlusa.com.
Specs verified against the manufacturer spec sheet on — stihlusa.com.
| Spec | Stihl MS 311 | Stihl MS 391 |
|---|---|---|
| Engine | ||
| Displacement | 3.6 cu in (59 cc) | 3.91 cu in (64.1 cc) |
| Engine Power | 4.2 hp | 4.4 hp |
| Fuel Capacity | 0.16 gal (0.6 L) | 0.16 gal (0.6 L) |
| Power | 3.1 kW | 3.3 kW |
| Power-to-Weight | 2 kg/kW | 1.9 kg/kW |
| Bar & Chain | ||
| Chain Gauge | 0.050 in | 0.050 / 0.063 in |
| Chain Pitch | 3/8" | 3/8" |
| Guide Bar Length | 17.99 in (457 mm) | 17.99 in (457 mm) |
| Oil Capacity | 11.83 fl oz (350 mL) | 11.8 fl oz (348.97 mL) |
| Dimensions & Weight | ||
| Length | 18.03 in (458 mm) | 18.03 in (458 mm) |
| System Weight | 16.73 lb (7.59 kg) | 16.73 lb (7.59 kg) |
| Weight | 13.8 lb (6.26 kg) | 13.67 lb (6.2 kg) |
| General | ||
| Power Source | gas | gas |