4. PRE-OPERATION CHECKS
Fuel Recommendations Use unleaded gasoline with a pump octane rating of 86
or higher.
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/gaso-
line mixture. Avoid getting dirt or water in the fuel tank.
Occasionally you may hear light “spark knock” or “ping-
ing” (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 an authorized Honda Ma-
rine or Honda Outboard Motor dealer.
1-1 Running the engine with persistent spark
knock or pinging can cause engine damage.
Running the engine with persistent spark knock or ping-
ing is misuse, and the Distributor’s Limited Warranty
does not cover parts damaged by misuse.
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