What is the chain tension on a 2003 yz 125?

The chain tension on a 2003 Yamaha YZ125 should generally be set to allow about 1 to 1.5 inches of play in the chain when measured at the midpoint between the rear axle and the swingarm. Proper tension is crucial for optimal performance and to prevent excessive wear on both the chain and sprockets. Always refer to the owner's manual for specific adjustments and maintenance recommendations.