The 2015 Yamaha XC155F has two recalls, both carrying similar crash risk: a speed sensor wire that can fatigue and break, leaving the rider with no speedometer reading, and loose cylinder head nuts that can allow coolant to foul the spark plug.
When the speed sensor wire fails, the speedometer goes dark entirely, making it harder to judge safe riding speed. On the engine side, if the cylinder head nuts were not tightened properly, coolant can reach the spark plug and cause the engine to stall at idle, with the possibility that it will not restart.
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.
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Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The speed sensor lead wire may not be clamped securely enough, causing it to fatigue and break over time.
What the fix does
Dealers will replace the speed sensor assembly at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
