{"nhtsa_id":620560,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-08-14","date":"2001-04-09","document_id":"M1112","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM:IGNITION:MODULE","mfr_system":null,"summary":"SOME CUSTOMERS WITH AN EARLIER STOCK ECM MAY EXPERIENCE A COLD AMBIENT, LIGHT LOAD, 1800 - 2000 RPM STUMBLE OR COLD WEATHER PLUG FOULING. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/620560","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"ignition","name":"Ignition","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"HARLEY-DAVIDSON","model":"EVOLUTION","year_from":1997,"year_to":1998,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"TWIN CAM","year_from":1999,"year_to":2001,"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":[]}