Yamaha WR250F 2023, Owner'S Manual, Page: 44 / 176

ENGINE SPECIFICATIONS
2-3
Push rod bending limit 0.30 mm (0.012 in)
Drivetrain
Primary reduction ratio 3.353 (57/17)
Transmission type Constant mesh 6-speed
Gear ratio
1st 2.385 (31/13)
2nd 1.813 (29/16)
3rd 1.444 (26/18)
4th 1.143 (24/21)
5th 0.957 (22/23)
6th 0.815 (22/27)
Secondary reduction ratio 3.923 (51/13)
Final drive Chain
Air filter
Air filter element Wet element
Air filter oil grade Yamaha foam air filter oil or other quality foam
air filter oil
Idling condition
Engine idling speed 1900–2100 r/min
Exhaust gas sampling point Sampling port on the exhaust pipe
Coolant temperature 70–80

C (158–176

F)
CO% 3.7–6.7 %
Intake vacuum 45.4 kPa (341 mmHg, 13.4 inHg)
Throttle grip free play 3.0–6.0 mm (0.12–0.24 in)