Honda Rebel 1100, model year 2021. Filed by Honda (American Honda Motor Co.) and reported to NHTSA on 16 December 2021. 1,022 vehicles potentially affected.
What the notice says 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.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Honda's own number for this recall: KN1. That is the number on the owner letter and on the dealer paperwork. 21V987 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 21V987 cover?
- Honda Rebel 1100, model year 2021.
- What is wrong with them?
- 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.
- What can happen if it is not put right?
- An insufficiently sealed radiator cap may leak or spray hot coolant, increasing the risk of injury or crash.
- Is there a fix yet?
- Yes, and it is free. 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.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Honda calls this recall KN1, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “An insufficiently sealed radiator cap may leak or spray hot coolant, increasing the risk of injury or crash.”
affected
in the notice
caught
| Campaign | 21V987 |
|---|---|
| Filed by | Honda (American Honda Motor Co.) |
| System at fault | Engine And Engine Cooling:Cooling System:Radiator Assembly |
| Reported to NHTSA | 16 December 2021 |
| Model years | 2021-2021 |
| Vehicles named | HONDA REBEL 1100 |
What the notice says today
The consequence
An insufficiently sealed radiator cap may leak or spray hot coolant, increasing the risk of injury or crash.
The remedy
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.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 588 notices in the record whose component field names engine and engine cooling. Across that group the median wait before owners were written to was 47 days.
Last checked . No change has been recorded in the wording.
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 21V987, wording as read on 16 September 2026. https://carsmultiverse.com/recall/21v987/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Honda notices we hold
- 26V500: 2017-2023, 2025 CMX500, 2017-2023, 2025-2026 CMX300, and 2025 Honda SCL500 motorcycles
- 26V424: 2026 Pilot and Passport
- 26V423: 2018-2020 Odyssey
- 26V366: 2023-2026 CR-V Hybrid, Accord Hybrid, and 2025-2026 CR-V Fuel Cell EV
- 26V365: 2016-2022 Honda Pilot, 2017-2023 Ridgeline, 2019-2023 Passport, and 2014-2020 Acura MDX
- 26V306: 2024-2025 Honda Prologue and 2024 Acura ZDX
- 26V227: 2018-2022 Odyssey
- 26V194: 2025 CB1000SP motorcycles
All 256 Honda campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 21V987 on 23 August 2026, they were:
- Defect summary
307cfdea - Consequence
7d1880c5 - Remedy
341c4bf5
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 21V987 · how the whole register is watched
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