Honda HS622 Owner's Manual page 18

Fuel Recommendations
Use unleaded gasoline with a pump octane rating of 86 or higher.
This engine is desi
P
ned to operate on unleaded gasoline. Unleaded
gasoline produces ewer engine and spark plug deposits and extends
exhaust system life.
Never use stale or contaminated gasoline or an oil/gasoline mixture.
Avoid getting dirt or water in the fuel tank.
Occasionally you ma
(metallic rapping
noise Y
hear a light "spark knock" or "pinging"
cause for concern.
while operating under heavy loads. This is no
If spark knock or pin
ing occurs at a steady engine speed, under
normal load, than
persists,
see an aut R
e % rands of gasoline. If spark knock or pinging
orized Honda servicing dealer.
Running the engine with persistent spark knock or pinging can cause
engine damage.
Running the engine with persistent spark knock or pinging is misuse,
and the Distributor's Limited Warranty does not cover parts damaged
by misuse.
16