2021 Honda Rebel 1100 Recall: Radiator cap may have been improperly formed during manufacturing, which…
NHTSA campaign 21V987000 · Engine and Engine Cooling · filed Dec 16, 2021 · verified Jul 30, 2026
The defect
Honda (American Honda Motor Co.) is recalling certain 2021 Honda Rebel 1100 (CMX1100) motorcycles. The radiator cap may have been improperly formed during manufacturing, which could create an insufficient seal.
The risk
An insufficiently sealed radiator cap may leak or spray hot coolant, increasing the risk of injury or crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Dealers will replace the radiator cap and refill any lost coolant, free of charge. Owner notification letters were mailed February 22, 2022. Owners may contact Honda service at 1-888-234-2138. Honda's number for this recall is KN1.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Affected vehicles
| Make | Model | Model years |
|---|---|---|
| Honda | Rebel 1100 | 2021 |
Related recalls
Other campaigns involving Honda vehicles
Source: NHTSA recall database, campaign 21V987000 (manufacturer number KN1). Data last verified Jul 30, 2026.