The 2017 Yamaha XC155 has two recalls, the more serious involving a primary sheave nut that can loosen and fall off, causing the engine to stall with no ability to restart.
The second recall also carries a stall risk: cylinder head nuts may not be properly tightened and can work loose over time, allowing coolant to contaminate the spark plug. A fouled spark plug can cause the engine to cut out at idle and potentially not restart. Both issues leave the rider without power in traffic, raising the risk of a crash.
At a glance
What can fail
The nut securing the primary sheave can loosen and detach from the scooter's transmission system.
What the fix does
Dealers replace the primary retaining nut and washer with a redesigned version that prevents loosening.
Summarized — see the official notice for exact wording, dates, and contacts.
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At a glance
What can fail
The cylinder head nuts may not have been tightened properly during manufacturing and could loosen over time, causing coolant to leak into the spark plug area.
What the fix does
Dealers will replace the cylinder head gasket and retighten the cylinder head nuts at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
