2019 Honda Cmx300 problems, complaints & recalls
Safety recalls (2)
Steering: Steering Wheel/Handle Bar 2026-07-30 · campaign 26V500000 · 43,913 vehicles
Defect: Honda (American Honda Motor Co.) is recalling certain 2017-2023, 2025 CMX500, 2017-2023, 2025-2026 CMX300, and 2025 Honda SCL500 motorcycles. The handlebar lock screw may loosen and detach.
Risk: A detached screw may lodge between the frame and stem, interfering with steering and increasing the risk of a crash or injury.
Fix: Dealers will replace the lock screw and apply thread lock, free of charge. Owner letters were mailed September 29, 2026. Owners may contact Honda's customer service at 1-866-784-1870. Honda's number for this recall is KU8. This recall expands previous NHTSA recall number 26V146. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning August 4, 2026.
Power Train:manual Transmission 2019-06-04 · campaign 19V412000 · 3,898 vehicles
Defect: Honda (American Honda Motor Co.) is recalling certain 2019 CB300R, 2018 CBR300R, 2018 CRF250L, 2018 CRF250L Rally, and 2018-2019 CMX300 motorcycles. The circlip, on the transmission's main shaft, may detach allowing for gear misalignment.
Risk: A misaligned gear can shift the transmission from neutral into gear during engine start, potentially resulting in unexpected motorcycle movement or seize the transmission and rear wheel while the motorcycle is in motion. Both conditions increase the risk of crash or injury.
Fix: Honda will notify owners, and dealers will replace the transmission main shaft, free of charge. The recall began July 8, 2019. Owners may contact Honda customer service at 1-866-784-1870. Honda's number for this recall is KK3.
Service bulletins (1)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Equipment Adaptive/Mobility 2021-02-19 · TheWrench2Feb.21 · Service Bulletin/Repair Instructions
the wrench - if the right engine cover is leaking coolant on any of the models listed, this could be due to the water pipe causing a gap at the clutch cover side. replacing the o-ring will not fix the leak. instead, replace the water pipe.
What owners report
No detailed complaint narratives on file.
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.