Honda EB12D Owner's Manual page 25

6. After the engine starts, let the engine switch return to the ON position.
ON
7. Warm the engine for 2 or 3 minutes before applying a load to the
generator. Blue smoke might be emitted from the exhaust during the
warm-up. This is a normal occurrence.
piEiq pr oper engine
warm-up will stabiliie the engine speed. It also is
needed to warm-up the engine oil and properly lubricate internal engine
parts.
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