Honda CRF150F 2007 Owner's Manual page 157

Specifications
Engine Specifications
Valve clearance
(cold)
Spark plug
(standard)
Spark plug
(For extend high
speed riding)
Spark plug gap
Idle speed
148
Technical Information
Intake: 0.003 in
(0.08 mm)
Exhaust: 0.005 in
(0.12 mm)
CPR8EA-9 (NGK)
CPR9EA-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
5th
Final reduction
Final drive
3.350
2.786
1.875
1.409
1.120
0.938
3.615
chain