Honda CRF230F 2007 Owner's Manual page 119

Drive Chain
Lubrication
Lubricate every 300 miles (500 km) or sooner
if chain appears dry.
The O-rings in this chain can be damaged by
steam cleaning, high pressure washers, and
certain solvents.
110
Servicing Your Honda
Lubricate only with SAE 80 or 90 gear oil.
Commercial chain lubricants may contain
solvents which could damage the rubber
O-rings.