- Single exhaust pipe
- No oil filter
- Smaller engine size (typically less than 500cc)
- Lighter weight
- More compact design
- Higher power-to-weight ratio
- Louder exhaust note
- Produces more smoke
4-Stroke Engine
- Dual exhaust pipes
- Oil filter
- Larger engine size (typically over 500cc)
- Heavier weight
- More complex design
- Lower power-to-weight ratio
- Quieter exhaust note
- Produces less smoke