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It depends on where you use the bike . If you have ever ridden a Harley in very hot conditions and had the bike start cutting out due to vapor lock you would understand. The fuel gets to the point it will boil and vapor lock the fuel system.
High heat, high altitudes, that kind of thing under some conditions can cause the engine heat to boil the fuel and vapor lock the engine.
It is simply a heat shield. Needed on bikes that have the enclosed engine areas such as the 1500. Not a concern with the open engines like the older models .
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