My son's '97 Honda CR80 recently developed this problem. Bike is all stock with the exception of Boyesen reeds. The jetting is already on the lean side (#122 main, 2nd groove on needle, 2-1/2 out on air screw) has fresh gas, HP-2 @ 32:1. I did find rust on the coil mounting bolts and frame, cleaned the fuel filter, checked all electrical connections, inspected the carb and reeds. I'm planning on ohm testing all electrcal components, maybe tonight (yes, I have a factory manual). It may need a top - end rebuild (could this be my problem?) it's been at least 15 tanks of fuel since rebuild. BTW, bike is used for trail and play riding only. I won't be able to check posts 'til tonight, so thanks in advance.:think