Fuel Recommendations - Honda BF25A Owner's Manual

5. PRE-OPERATION CHECKS
Fuel Recommendations
Use unleaded gasoline with a pump octane rating of 86 or
higher.
These outboard motors are certified 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 in 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 Marine dealer.
-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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