Honda CRF125F 2023 Owner's Manual page 159

Specifications
Engine Specifications
Valve clearance
(cold)
Spark plug
(standard)
Spark plug gap
Idle speed
(non-adjustable)
150
Technical Information
Intake: 0.004 ± 0.001 in
(0.10 ± 0.02 mm)
Exhaust:0.006 ± 0.001 in
(0.15 ± 0.02 mm)
CPR6EA-9 (NGK)
0.031- 0.035 in
(0.80 - 0.90 mm)
1,400 ± 100 rpm
Power Transmission
Primary reduction
Gear ratio, 1st
2nd
3rd
4th
Final reduction
Final drive
Power Transmission
Drive chain
freeplay
New chain length
Used chain service
limit length
3.250
3.181
1.705
1.238
0.916
CRF125F: 3.538
CRF125FB: 3.769
chain
1–1 3/8 in (25–35 mm)
20.0 in (508 mm)
distance between a
span of 41 pins
20.4 in (518 mm)
distance between a
span of 41 pins