Pumping the throttle may cause a raw fuel to accumulate in the
intake air duct, creating a fire hazard in the event of a backfire.
If this occurs, maintain a cranking action to suck the flames
the engine. An outside attendant with a fire extinguisher is
advised for cold starts without preheat.
If the engine does not start during the first few attempts, or
if engine firing diminishes in strength, it is probable that the
spark plugs have frosted over. Preheat must be used before
another start is attempted.
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