Overview
Motorcycles are commonly grouped according to the fundamental technology that powers their drivetrain. The principal categories are:
| Engine type | Typical characteristics | Notable production models |
|---|---|---|
| Petrol (internal‑combustion) – four‑stroke | Uses a four‑stroke Otto cycle; the most prevalent engine type in modern motorcycles. | • Honda CBR600RR (inline‑four) • Yamaha YZF‑R1 (inline‑four) • Ducati Monster 821 (L‑twin) • Harley‑Davidson Sportster (V‑twin) |
| Petrol – two‑stroke | Completes a power cycle in two piston strokes; lighter and higher‑revving but less fuel‑efficient. Production largely ended in the early 2000s. | • KTM 250 SX‑F (single‑cylinder) • Yamaha YZ125 (single‑cylinder) • Honda NSR250 (parallel‑twin, 1984–2001) |
| Rotary (Wankel) | Uses a rotary piston (Wankel) instead of reciprocating pistons; smooth power delivery, limited durability and emissions compliance. | • Suzuki RE5 (single‑rotor, 1973–1975) |
| Diesel | Rare in motorcycles due to weight and vibration; some prototypes and limited‑run models exist. | • Royal Enfield Diesel (prototype, 2006) – no mass‑produced diesel motorcycles are listed in major encyclopedic sources. |
| Electric | Powered by rechargeable battery packs and electric motors; zero tailpipe emissions. | • Zero SR/F (hub‑motor, 2019‑present) • Energica Ego (liquid‑cooled permanent‑magnet motor, 2014‑present) • Harley‑Davidson LiveWire (2020‑present) • NIU NQiGTS (electric scooter, 2020‑present) |
| Hybrid | Combines an internal‑combustion engine with an electric motor for assistance or plug‑in capability. Production numbers are low; most examples are scooters or concept bikes. | • Honda PCX Hybrid (2020‑present, scooter with small gasoline engine and electric assist) • Kawasaki Ninja 400 Hybrid (concept, not mass‑produced) |
Additional classifications commonly used alongside “type of engine”
- Cylinder configuration – single‑cylinder, parallel‑twin, V‑twin, inline‑four, V‑four, boxer, L‑twin, etc.
- Cooling method – air‑cooled, liquid‑cooled, oil‑cooled.
- Induction system – carbureted, fuel‑injected, direct‑injected.
These secondary attributes are typically listed in more detailed motorcycle directories but are not primary “engine‑type” categories.
Notes
- The two‑stroke segment largely ceased after stricter emissions regulations in the early 2000s; only a few off‑road and competition models continue to use two‑stroke engines.
- Diesel motorcycles have not achieved commercial viability; only experimental or very limited production units are recorded.
- Hybrid motorcycles remain a niche market; most manufacturers focus on pure electric models for future growth.
This list reflects the categories and representative models documented in reputable automotive and encyclopedic sources up to 2024.
