Honda CRF150F 2007 Owner's Manual page 118

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.
Lubricate only with SAE 80 or 90 gear oil.
Commercial chain lubricants may contain
solvents which could damage the rubber
O-rings.
Drive Chain
Servicing Your Honda
109