Fuel Recommendations - Honda HRB536C Owner's Manual

4. PRE-OPERATION CHECKS

Fuel Recommendations

Use gasoline with an octane rating of 86 or higher (unleaded preferred).
This engine is designed to operate on unleaded gasoline. Unleaded gasoline
produces fewer 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 may hear light "spark knock" or "pinging" (metallic rapping
noise) while operating under heavy loads. This is no cause for concern.
If spark knock or pinging occurs at a steady engine speed, under normal load,
change brands of gasoline. If spark knock or pinging persists, see your
servicing dealer.
NOTICE
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
warranty does not cover parts damaged by misuse.
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