Simplicity 4040 PowrMax Engine
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| Engine Detail | |
| Onan CCKA | |
| gasoline | |
| 2-cylinder | |
| air-cooled horizontal-shaft opposed-twin | |
| Displacement | 816 cc 49.8 ci |
| Bore/Stroke | 3.25x3.00 inches 83 x 76 mm |
| Power (gross) | 16.5 hp 12.3 kW |
| Fuel system | Marvel-Schebler downdraft carburetor |
| Air cleaner | paper element |
| Compression | 7:1 |
| Rated RPM | 3600 |
| Idle RPM | 1200-3850 |
| Starter | electric |
| Starter volts | 12 |
| Sparkplug | Champion H-8 |
| Sparkplug gap | 0.025 inches 0.635 mm |
| Point gap | 0.020 inches 0.508 mm |
| Intake valve clearance | 0.007 inches 0.178 mm |
| Exhaust valve clearance | 0.016 inches 0.406 mm |
| Engine Oil | |
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| Oil capacity | 3.5 qts 3.3 L |
| Oil change | 50 h |
| Page information | |
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| Peter Easterlund - owner/author | |
| Email: Peter@TractorData.com | |
| Updated on June 7, 2023 |