Honda CRF230F 2006 Owner's Manual page 159

Specifications
Engine Specifications
Valve clearance
(cold)
Spark plug
(standard)
Spark plug
(cold climate;
below 5°C, 41°F)
Spark plug gap
Idle speed
150
Technical Information
Intake: 0.004 in
(0.10 mm)
Exhaust: 0.004 in
(0.10 mm)
DPR8EA-9 (NGK) or
X24EPR-U9 (DENSO)
or
DPR7EA-9 (NGK)
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
6th
Final reduction
Final drive
3.090
2.769
1.941
1.450
1.148
0.960
0.812
3.846
chain