Yamaha YZ426F 2001 Manuel D'atelier Du Proprietaire page 56

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FUEL
Always use the recommended fuel as stated
below. Also, be sure to use new gasoline the
day of a race.
Use only unleaded gasoline. The use of
leaded gasoline will cause severe damage
to the engine internal parts such as valves,
piston rings, and exhaust system, etc.
NOTE:
If knocking or pinging occurs, use a different
brand of gasoline or higher octane grade.
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FUEL
Recommended fuel:
Except for ZA:
Premium unleaded gasoline
only with a research octane
number of 95 or higher.
For ZA:
Premium gasoline
CAUTION:
GEN
INFO