Image available on the official notice.
Motorcycles (Yamaha SEROW XT250, tricker XG250) - Repair
Official notice
14 Jun 2022
Last checked
27 Oct 2026
An official CAA Japan notice concerns Motorcycles (Yamaha SEROW XT250, tricker XG250) - Repair. Engine (engine control unit) defect. ■ Defective component: Engine (engine control unit). ■ Condition of the structure, equipment or performance deemed noncompliant with standards and its cause: ① Due to inappropriate programming of the engine control unit (ECU), holding the throttle slightly open causes the ECU to recognize the throttle as closed and reduce fuel, making the air-fuel mixture entering the combustion chamber lean. Slowly opening the throttle from this state makes the mixture even leaner and, in the worst case, the engine may stall. ② Due to inappropriate programming of the engine control unit, holding the throttle slightly open causes excessive fuel enrichment, making the mixture entering the combustion chamber rich. This triggers fuel-reduction control to lean out the mixture. If the throttle is then closed, fuel-enrichment control stops but fuel-reduction control continues, making the mixture lean and, in the worst case, the engine may stall. ③ Due to inappropriate programming of the engine control unit, continued idling during engine warm-up triggers fuel-reduction control to clean up exhaust emissions, making the mixture entering the combustion chamber lean. Consequently, engine speed becomes unstable and, in the worst case, the engine may stall. Published 2022-06-14.
What to do now
Recall 5165. ■ Remedial measures: Reprogram the engine control unit on all vehicles with the corrected program.
Units affected
15,089
Recall number
5165
Official notice
2022-06-14
The hazard
The hazard
Engine (engine control unit) defect. ■ Defective component: Engine (engine control unit). ■ Condition of the structure, equipment or performance deemed noncompliant with standards and its cause: ① Due to inappropriate programming of the engine control unit (ECU), holding the throttle slightly open causes the ECU to recognize the throttle as closed and reduce fuel, making the air-fuel mixture entering the combustion chamber lean. Slowly opening the throttle from this state makes the mixture even leaner and, in the worst case, the engine may stall. ② Due to inappropriate programming of the engine control unit, holding the throttle slightly open causes excessive fuel enrichment, making the mixture entering the combustion chamber rich. This triggers fuel-reduction control to lean out the mixture. If the throttle is then closed, fuel-enrichment control stops but fuel-reduction control continues, making the mixture lean and, in the worst case, the engine may stall. ③ Due to inappropriate programming of the engine control unit, continued idling during engine warm-up triggers fuel-reduction control to clean up exhaust emissions, making the mixture entering the combustion chamber lean. Consequently, engine speed becomes unstable and, in the worst case, the engine may stall.
How to check if you're affected
How to check if you're affected
Compare the product name and identifiers below with the item you own. Check the official notice for the affected products and next steps.
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Where it was sold
Where it was sold
Retailer information is not currently available in RecallScope. Check the official notice for distribution details.
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Company & contacts
Company & contacts
Brand: Yamaha. Contact: ヤマハ発動機株式会社. Phone 0120-090-819.
Source & status
Source & status
Recall details
Recall details
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Documents, notices & source
See the official notice and source documents for full details.
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