Needle Jet

Fuel Dispersement at part throttle / mid rpm.
(pattern and quality)

HDJ High Dispersal Jet

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Stock needle jet allows fuel to exit in large drops that burn incompletely in the combustion chamber - decreasing power and response. Factory Pro high dispersal jet system.
Maximum power, better response and cleaner running occurs when fuel is sprayed into the port in a more burnable, denser mist.