Amico AH7500E, Руководство пользователя

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Running the engine with persistent spark knock or pinging is misuse, and
the Distributor's Limited Warranty does not cover parts damaged by
misuse.
Fuel Recommendation
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.
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 an
authorized AMICO generator dealer.
Running the engine with persistent spark knock or pinging can cause
engine damage.
NOTICE