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BackClassification by Crankshaft Speed
| Classification Ignition system | Low Speed | Middle Speed | High Speed |
|---|---|---|---|
| Electric spark plug | Less than 800 r.p.m. | 800 – 2,500 r.p.m. | More than 2,500 r.p.m. |
| Injection | Less than 700 r.p.m. | 700 – 1,000 r.p.m. | More than 1,000 r.p.m. |