{"nhtsa_id":607356,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-09-21","date":"1999-05-17","document_id":"M1080","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:CLUTCH ASSEMBLY","mfr_system":null,"summary":"HARLEY DAVIDSON HAS LEARNED THAT COMPRESSION OF THE CLUTCH INSPECTION COVER O-RING ON SOME VEHICLES WITH 1998 AND EARLIER EVOLUTION ENGINES CAN LEAD TO DISTORTION OF THE COVER RESULTING IN LEAKAGE OF THE PRIMARY CHAINCASE LUBRICANT. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/607356","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"clutch","name":"Clutch","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"HARLEY-DAVIDSON","model":"HARLEY DAVIDSON","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}