The Yamaha YZ125 is Yamaha's 125cc two-stroke motocrosser, a model with roots in the 1970s and one of the few two-strokes that has stayed in production through the four-stroke era. Light, agile and lively, it is a favourite learning tool for young racers and a fun bike for experienced riders.
Yamaha has updated it regularly, with an aluminium frame, Kayaba suspension and a major update for 2022 that brought a new engine, chassis and bodywork. It is a closed-course competition machine. Rivals include the KTM 125 SX, Husqvarna TC 125 and GasGas MC 125.
| Year | Photo | Engine | Power | Weight | Seat | Fields |
|---|---|---|---|---|---|---|
| 2027 |  |
125 cc | – | 86 kg | 980 mm | 42 |
| 2026 |  |
125 cc | – | 86 kg | 980 mm | 42 |
| 2025 |  |
125 cc | – | 86 kg | 980 mm | 43 |
| 2024 |  |
125 cc | – | 86 kg | 980 mm | 43 |
| 2023 | |
125 cc | – | 86 kg | 980 mm | 43 |
| 2022 |  |
125 cc | – | 86 kg | 975 mm | 43 |
| 2021 |  |
125 cc | – | 86 kg | 975 mm | 43 |
| 2020 |  |
125 cc | – | 86 kg | 975 mm | 43 |
| 2019 |  |
125 cc | 33.5 hp | 86 kg | 975 mm | 46 |
| 2018 |  |
125 cc | 34 hp | 86 kg | 975 mm | 45 |
| 2017 |  |
124 cc | – | 86 kg | 975 mm | 43 |
| 2016 |  |
125 cc | 34 hp | 86 kg | 975 mm | 45 |
| 2015 |  |
125 cc | 34 hp | 86 kg | 975 mm | 44 |
| 2014 |  |
124 cc | – | 86 kg | 998 mm | 44 |
| 2013 |  |
124 cc | – | 86 kg | 998 mm | 43 |
| 2012 |  |
124 cc | – | 86 kg | 998 mm | 42 |
| 2011 |  |
124 cc | – | 86 kg | 998 mm | 43 |
| 2010 |  |
124 cc | – | 86 kg | 998 mm | 43 |
| 2009 |  |
124 cc | – | 86 kg | 998 mm | 43 |
| 2008 |  |
124 cc | – | 86 kg | 998 mm | 43 |
| 2007 |  |
124 cc | – | 86 kg | 998 mm | 42 |
| 2006 |  |
124 cc | – | 86 kg | 998 mm | 36 |
| 2005 |  |
124 cc | – | 87 kg | 993 mm | 42 |
| 2004 |  |
124 cc | – | 87 kg | 992 mm | 43 |
| 2003 |  |
124 cc | – | 88 kg | 994 mm | 42 |
| 2002 | |
124 cc | – | 88 kg | 994 mm | 42 |