Honda TRX450ER Owner's Manual page 166

Drive Chain
Lubrication
Refer to Saf ety Precautions on page 77 .
Lubricate every 30 days of riding or sooner if chain appears dry.
Lubricate only with SAE 80 or 90 gear oil. Commercial chain lubricants
may contain solvents which could damage the rubber O-rings.
Servicing Your Honda 157