The 2018 Yamaha XC155 has two recalls, both involving engine stalls that can leave the rider unable to restart and at risk of a crash. In the more serious issue, a nut securing the primary sheave in the drivetrain can loosen and fall off entirely, causing the engine to stall with no ability to restart. The second recall involves cylinder head nuts that may not be properly tightened, which can allow coolant to foul the spark plug and cause the engine to stall at idle, again potentially leaving the scooter unable to start.
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.
