9. DRIVE AND DRIVEN PULLEYS Mongoose/KXR 90/50 Measure the clutch lining thickness. Service Limit: Mongoose/KXR 90: 1.5mm replace if below Mongoose/KXR 50: 1.0mm replace if below INSPECTION Measure the driven face spring free length. Service Limit: Mongoose/KXR 90: 137.5mm below Mongoose/KXR 50: 92.8mm below Check the driven face for wear or damage. Measure the driven face O.D. Service Limit: 33.94mm below 9-11