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148
Technical Information
Specifications
Engine Specifications
Valve clearance
(cold)
Intake: 0.004 in
(0.10 mm)
Exhaust: 0.006 in
(0.15 mm)
Spark plug
(standard)
CPR6EA-9 (NGK)
Spark plug gap 0.03–0.04 in
(0.8–0.9 mm)
Idle speed 1,400 ± 100 rpm
Power Transmission
Primary reduction 3.250
Gear ratio, 1st 3.181
2nd 1.705
3rd 1.238
4th 0.916
Final reduction CRF125F: 3.538
CRF125FB: 3.769
Final drive chain
Power Transmission
Drive chain
freeplay
1–1 3/8 in (25–35 mm)
New chain length 20.0 in (508 mm)
distance between a
span of 41 pins
Used chain service
limit length
20.4 in (518 mm)
distance between a
span of 41 pins
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