Honda 2009 TRX90X Owner's Manual page 149

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Drive Chain
Lubrication
Refer to Saf ety Precautions on page 84 .
Lubricate every 30 days of riding or sooner if chain appears dry.
Lubricant: Pro Honda HP Chain Lube or an equivalent chain lubricant
designed specifically for use on O-ring chains.
Commercial chain lubricants not designed for motorcycle drive chains
may contain solvents which could damage the O-rings.
140 Servicing Your Honda