Regulation Values of Japan
Motorcycle Exhaust Emissions Standards of Japan
| Item | Regulation Values | |
| 4-stroke | 2-stroke | |
| CO (carbon monoxide) g/km | 13.00 | 8.00 |
| HC (hydrocarbons) g/km | 2.00 | 3.00 |
| NOx (nitrogen oxides) g/km | 0.30 | 0.10 |
Noise Regulation Values of Japan (Effective on and after October 1, 2001)
| Item | Class A Motorcycle 50cc or Less |
Class B Motorcycle Over 50cc to 125cc or Less |
Light Vehicle Over 125cc to 250cc or Less |
Small Vehicle Over 250cc |
| Exhaust noise near the outlet, standard value dB(A) | 84 | 90 | 94 | 94 |
| Acceleration noise, standard value dB(A) | 71 | 71 | 73 | 73 |
| Constant speed pass-by noise, standard value dB(A) | 65 | 68 | 71 | 72 |
