HONDA EU1000i - Manual (Page 33)

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FUEL RECOMMENDATIONS
Use unleaded gasoline with a pump octane rating of 86 or higher.
This engine is certified to operate on unleaded gasoline.
Unleaded gasoline produces fewer engine and spark plug deposits
and extends exhaust system life.
Running the engine with persistent spark knock or pinging is misuse,
and the
Distributor’s Limited Warranty does not cover parts damaged
by misuse.
Running the engine with persistent spark knock or pinging can cause
engine damage.
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 generator dealer.
Occasionally you may hear a light ‘‘spark knock’’ or ‘‘pinging’’
(metallic rapping noise) while operating under heavy loads. This is no
cause for concern.
Never use stale or contaminated gasoline or an oil/gasoline mixture.
Avoid getting dirt or water in the fuel tank.
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