| Furthermore, two-strokes expel 25-30 percent of their fuel unburned to the water. |
| Due to this distinction, two-strokes are more powerful but consume more fuel and are more polluting also. |
| Four-stroke engines are heavier than two-strokes but the technology means they burn fuel more completely and emit fewer pollutants. |
| Four-strokes just run so much cleaner than the old two-strokes. |
| Eligible two-strokes will receive an additional three years Yamaha Extended Service coverage. |
| I had some good performances on 500 cc two-strokes in 1998 and 1999 but some still weren't convinced that I could win on the big bikes. |
