Yamaha DT501988 Owner's Manual page 43

E-803
Recommended fuel:
REGULAR UNLEADED GASOLINE
Fuel tank capacity:
Total: 8.5 L (1.9 Imp gal, 2.2 US gal)
Reserve: 2.0 L (0.4 Imp gal, 0.5 US gal)
Your Yamaha engine has been designed to
use regular unleaded gasoline with a pump
octane number ( [R
+
M]/2) of 86 or higher,
or research octane number of 91 or higher.
If knocking or pinging occurs, use a different
brand of gasoline or premium unleaded fuel.
Unleaded fuel will give you longer spark plug
life and reduced maintenance cost. If un-
leaded gasoline is not available, then leaded
regular gasoline can be used.
Gasohol
There are two types of gasohol, gasohol
containing ethanol and that containing
methanol. Gasohol containing ethanol can
5·10
be used if ethanol content does not exceed
10%. Gasohol containing methanol is not
recommended by Yamaha because it can
cause fuel system damage or vehicle per-
formance problems.