Honda XL700V Owner's Manual page 63

Use unleaded petrol with a research
octane number of 91 or higher.
The use of leaded petrol will cause
premature damage to the catalytic
converters.
CD
NOTICE
If "spark knock" or "pinking" occurs at a
steady engine speed under normal load,
change brands of petrol. If spark knock or
pinking persists, consult your Honda
dealer.
Failure to do so is considered misuse, and
damage caused by misuse is not covered
by Honda's Limited Warranty.
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