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I changed my Like 150i belt at 8200 miles.  It looked as though it could have easily lasted another 2000 miles, but I changed it anyway.  Kymco belt Mitsuboshi 23100-LFB6-900.  Two of the rollers were showing obvious flat spots, so I installed a new set.  Roller set 22121-GFY6-325.  The variator boss was sticky with grease, and the roller cages were dirty but not sticky.  Variator plate was not worn, but I did scrub the belt residue from the place where it reached its upper limit of travel.  I cleaned everything with spray brake cleaner and installed with no lubricant at all on the boss, shaft, or rollers.  Now the scooter is much smoother and quicker at take-off.  Top speed increased slightly, too.  Noticeable difference in overall performance!  Earlier, at 7500 miles, I checked and adjusted the valves.  Intake valves were in spec, exhaust vales needed slight adjustment.  This made no noticeable difference in engine performance--but I felt better about it!