Yamaha YZ450FX 2021 Owner's Service Manual page 324

Fault code No.
Item
1 Delete the fault code.
70
Engine forcibly stops when the vehicle is left idling for a long period
of time.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
8-41
FUEL INJECTION SYSTEM