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Yamaha Smax Recall 20V277: Engine may stall at idle and fail to restart

NHTSA campaign 20V277, reported May 15, 2020, 3,116 vehicles potentially affected.

What this recall means for you

The cylinder head nuts on certain scooters may not have been tightened properly and could loosen over time. If they loosen, coolant can reach and foul the spark plug.

A fouled spark plug can cause the engine to stall at idle, and the engine may not restart. A sudden stall increases the risk of a crash.

Owners will be notified by Yamaha. Authorized dealers will replace the cylinder head gasket and tighten the cylinder head nuts at no cost to you. To check whether your vehicle is affected, look up your VIN for open recalls, or contact Yamaha customer service at 1-800-962-7926 and reference recall number 990137.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 20V277Yamaha Motor Corporation, USA
Component
ENGINE AND ENGINE COOLING:ENGINE
Problem
Yamaha Motor Corporation, USA (Yamaha) is recalling certain 2015-2018 XC155 scooters. The cylinder head nuts may not have been tightened properly and could loosen, allowing coolant to foul the spark plug.
Risk
A fouled spark plug could cause the engine to stall at idle and possibly not restart, increasing the risk of a crash.
Remedy
Yamaha will notify owners and dealers will replace the cylinder head gasket and tighten the cylinder head nuts, free of charge. The recall began May 29, 2020. Owners may contact Yamaha customer service at 1-800-962-7926. Yamaha's number for this recall is 990137.
Notes
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.safercar.gov.

Affected vehicles

Yamaha Smax2015201620172018
Yamaha XC155F2015