Engine
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| Engine Detail | |
| Engine | Kohler CF12.5-1216S |
| Fuel | gasoline |
| Cylinders | 1-cylinder |
| Cooling / layout | air-cooled vertical-shaft |
| Displacement | 398 cc 24.3 ci |
| Bore/Stroke | 3.425x2.638 inches 87 x 67 mm |
| Power | 9 hp 6.7 kW |
| Air cleaner | paper and foam |
| Compression | 8.9:1 |
| Idle RPM | 1350-3350 |
| Starter volts | 12 |
| Sparkplug | Champion RC12YC |
| Sparkplug gap | 0.040 inches 1.016 mm |
| Engine Oil | |
| Oil capacity | 2 qts 1.9 L |
| Oil change | 50 h |
| John Deere STX30 Engine | |
| Photo credit | Image courtesy of Matthew Marchand |
Values may vary by engine, transmission or configuration. View source page