9. DRIVE AND DRIVEN PULLEYS MXU 250R/300R SERVICE INFORMATION GENERAL INSTRUCTIONS · The drive pulley, clutch and driven pulley can be serviced with the engine installed in the frame. · Avoid getting grease and oil on the drive belt and pulley faces. Remove any oil or grease from them to minimize the slipping of drive belt and drive pulley. SPECIFICATIONS Unit: mm (in) Item Standard Service Limit Movable drive face bushing I.D. 26.98927.052 (1.079561.08208) 27.06 (1.0824) Drive face collar O.D. 26.9626.974 (1.07841.07896) 26.94 (1.0776) Drive belt width 23.624.4 (0.9440.976) 22 (0.88) Clutch lining thickness 0.5 (0.02) Clutch outer I.D. 153153.2 (6.126.128) 153.5 (6.14) Driven face spring free length 131 (5.24) Driven face O.D. 39.96539.985 (1.59861.5994) 39.94 (1.5976) Movable driven face I.D. 4040.025 (1.61.601) 40.06 (1.6024) Weight roller O.D. 22.9223.08 (0.91680.9232) 22.8 (0.912) TORQUE VALUES Drive face nut 9.5 kgf-m (95 Nm, 68 lbf-ft) Clutch outer nut 5.5 kgf-m (55 Nm, 40 lbf-ft) Drive plat nut 5.5 kgf-m (55 Nm, 40 lbf-ft) SPECIAL TOOLS Universal holder E017 Clutch spring compressor E027 Bearing puller E008 Oil seal and bearing install E014 TROUBLESHOOTING Engine starts but motorcycle won't move Lack of power · Worn drive belt · Worn drive belt · Broken ramp plate · Weak driven face spring · Worn or damaged clutch lining · Worn weight roller · Broken driven face spring · Fouled drive face Engine stalls or motorcycle creeps · Broken clutch weight spring 9-2