honda-automobiles hrr216vxa ユーザーズマニュアル

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SERVICING YOUR MOWER
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Fuel Recommendations
Use unleaded gasoline with a pump octane rating of 86 or higher.
These engines 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 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 servicing dealer.
NOTICE
Running the engine with persistent spark knock or pinging can cause 
engine damage.
This is considered misuse, and the Distributor’s Limited Warranty 
(page 57) does not cover parts damaged by misuse.