Honda CRF150F 2005 Owner's Manual page 145

Specifications
Engine Specifications
Valve clearance
(cold)
Spark plug
(standard)
Spark plug
(cold climate;
below 5°C, 41°F)
Spark plug gap
Idle speed
136
Technical Information
Intake: 0.004 in
(0.10 mm)
Exhaust: 0.004 in
(0.10 mm)
DPR8EA-9 (NGK) or
X24EPR-U9 (DENSO)
DPR7EA-9 (NGK) or
X22EPR-U9 (DENSO)
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
3.333
2.769
1.882
1.400
1.095
0.923
3.692
chain