Recall 21V251 affects 4,262 2015-2020 Yamaha XC155 scooters for a loose primary sheave nut. Do not drive. Free repair at any franchised Yamaha dealer.
A missing primary sheave nut can cause the scooter to stall and leave the engine unable to restart, increasing crash risk. Do not drive or ride the scooter, even for short trips. An abnormal engine noise often comes before the nut falls off. Repair is free at any franchised Yamaha dealer.
Yamaha is recalling 4,262 2015-2020 XC155 scooters because the primary sheave nut can loosen and fall off, leaving the scooter stalled without the ability to restart. Do not drive an affected scooter until a Yamaha dealer completes the free repair.
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What's wrong?
The primary sheave nut and washer on the 2015-2020 Yamaha XC155 help hold part of the engine's drive system in place. The primary sheave is part of the mechanism that transfers engine power through the scooter's transmission. That assembly depends on the retaining nut staying tight while the engine is running.
On affected scooters, the primary sheave nut can loosen during riding. As the nut backs off, the primary sheave can move out of position and contact the case cover. If the scooter keeps being ridden in that condition, the nut can fall off.
The warning sign is an abnormal engine noise while riding. Treat that noise as a reason to stop riding and have the scooter checked, because it is the sign Yamaha identified before the nut falls off.
Who's affected?
The engine component differs by model year. The 2019 XC155 identifies the primary sheave retaining nut; the other included years identify the primary sheave washer.
| 2016 Yamaha XC155 | Engine |
|---|---|
| 2019 Yamaha XC155 | Engine |
| 2020 Yamaha XC155 | Engine |
| 2017 Yamaha XC155 | Engine |
| 2018 Yamaha XC155 | Engine |
| 2015 Yamaha XC155 | Engine |
| Units affected | 4,262 |
| Field incidents | NHTSA has logged no field incidents to date. |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific scooter is included.
What's the safety risk?
A missing primary sheave nut can cause the scooter to stall and leave the engine unable to restart, increasing crash risk. Do not drive or ride the scooter, even for short trips. An abnormal engine noise often comes before the nut falls off. Repair is free at any franchised Yamaha dealer.
What should I do?
- Check your VIN to confirm your 2015-2020 Yamaha XC155 is included in this recall.
- Do not drive the scooter until the primary retaining nut and washer repair is complete.
- Arrange a tow or trailer transport if the scooter has to be moved to the dealer; do not drive it there yourself.
- Contact a franchised Yamaha dealer to schedule the free primary retaining nut and washer replacement that fixes the loosening primary sheave nut.
- Call Yamaha customer service at 1-800-962-7926 with questions, and reference recall number 21V251 when you call.
What happens at the repair
Do not ride the scooter until this recall repair is complete. At the dealer, a Yamaha technician replaces the primary retaining nut and washer with new design parts so the primary sheave nut stays secured. The recall repair is free, and Yamaha covers the replacement parts and labor through its dealer repair campaign. Owner notification letters were mailed on April 28, 2021, but the dealer can handle the repair now if your VIN is included.
Timeline
| April 9, 2021 | NHTSA published the recall |
|---|---|
| April 28, 2021 | Owner notification mailed |
| April 28, 2021 | Dealer notification began |
| April 28, 2021 | Interim owner notification (was planned for this date) |
| April 30, 2021 | Dealer notification ended |
Frequently asked questions
What is recall 21V251?
Recall 21V251 covers 4,262 2015-2020 Yamaha XC155 scooters with a primary sheave nut that can loosen and fall off. If the nut is missing, the scooter can stall and fail to restart, increasing crash risk. Yamaha dealers will replace the retaining nut and washer for free.
What should I do if my 2015-2020 Yamaha XC155 is on this recall?
Check your VIN to confirm your specific scooter is included in recall 21V251. If it is, do not drive or ride it. Contact a franchised Yamaha dealer to schedule the free replacement of the primary retaining nut and washer, and reference recall 21V251 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. Yamaha dealers will replace the primary retaining nut and washer with a new-design nut and washer free of charge.
What does 'do not drive' mean for this Yamaha scooter?
Do not drive or ride the scooter until the recall repair is complete. Yamaha advised owners not to ride because the primary sheave nut can loosen, fall off, and cause a stall without restart. Ask the Yamaha dealer how to move the scooter without riding it.
What warning signs should I watch for?
The recall does not list a reliable warning sign before the nut comes off. The stated risk is a stall without the ability to restart the engine. Treat VIN confirmation as the decision point, then keep the scooter off the road until a Yamaha dealer completes the repair.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V251000 |
|---|---|
| Yamaha customer service | 1-800-962-7926 |
| NHTSA recall # | 21V251 |
| NHTSA recall # (full) | 21V251000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 24, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →