1. Remove the fuel tank and air filter housing (see Chapter 4), and the right-hand heat shield. Visually inspect the hoses between the reed valves on the valve covers and the PAIR control valve behind the right-hand radiator, and between the control valve and the air filter housing, for kinks and splits and any other damage or deterioration (see illustration) Similarly check the vacuum hose between the control valve and its take-off point on the front cylinder intake duct. Make sure that all hoses are securely connected with a clamp on each end. Replace any hoses that are damaged or deteriorated.
25.1. PAIR system control valve and hoses - XL650V models
2. See Chapter 4 for further information and tests on the system.