{"nhtsa_id":11032492,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-05-08","date":"2026-04-25","document_id":"M1727","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; UNKNOWN OR OTHER; ENGINE","mfr_system":null,"summary":"SERVICE BULLETIN M1727: BIG TWIN INNER PRIMARY SEAL CHANGES. PURPOSE: Initial release. This bulletin informs dealers of changes to the Inner Primary Seal (Part No. 12052). The seal part number was changed from (Part No. 12052A, black in color) to (Part No. 12052B, brown in color). A new Inner Primary Seal (Part No. 12052C) has been released and the color has been changed back to black.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11032492-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11032492-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11032492","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HARLEY-DAVIDSON","model":"FLD","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHP","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHR","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHRC","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTCU","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTCU TC","year_from":2015,"year_to":2015,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTCUL","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTCUL TC","year_from":2015,"year_to":2015,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTCUTG","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTK","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTKL","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTKSE","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHTP","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHX","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHXS","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLHXSE","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLRT","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLS","year_from":2017,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLS103","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSS","year_from":2016,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTC","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTF","year_from":2016,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTF103","year_from":2015,"year_to":2015,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTFB","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTFBS","year_from":2016,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTN","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLSTNSE","year_from":2015,"year_to":2015,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLTRU","year_from":2016,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLTRUSE","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLTRX","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FLTRXS","year_from":2015,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDB","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDBC 103","year_from":2016,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDBP 103","year_from":2016,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDF","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDL","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDLS","year_from":2016,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXDWG","year_from":2016,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXSB","year_from":2015,"year_to":2017,"match":null,"vehicle_ids":[]},{"make":"HARLEY-DAVIDSON","model":"FXSE","year_from":2016,"year_to":2017,"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":[]}