The oil line routing for a 1990 Harley Davidson Fat Boy involves several key components. The oil is drawn from the tank through the oil pump, which then routes it through the oil filter. From the filter, oil flows to the engine's critical components, including the crankcase and cam chest, before returning to the oil tank through the return line. It's essential to ensure that all connections are secure and that the lines are free of kinks or blockages for optimal performance.
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