Description: Fuel injectors directly affect the air/fuel ratio for the engine and new fuel injectors do require a new or updated tune. This is a non-OEM product, accessory only! Specification: OE Number: 28160355,16400-004-0000,16400-004C-0000 O-Rings Included: Yes, preinstalled Orifice Type: 2 Holes Disc Flow Rate: Same as Pin Number: 2 Pins Material: Metal, Plastic Color: Black Voltage: DC 12V Size: 54x36mm / 2.13"x1.42"(L*W) O-Ring Diameter: 14mm/0.57" Fitment: for Hisun EFI 500 & 550 UTV ATV 2011-2018 for Massimo MSU500 for Challenger 500 550 for Coleman UT500 for Bighorn 500 Cowboy 500 Installation: Step 1. Make sure the engine is cool down. Disconnect the battery. Step 2. Remove the bolts and brackets from the fuel rail. Step 3. Disconnect the plug on each injector. Step 4. Lift the fuel rail and remove the injector from the fuel rail. Step 5. Press the new injector into the rail. Reattach the fuel rail and put the injectors in their respective holes. Step 6. Bolt down fuel rail. Reattach fuel line. Plug in injector connectors. Reconnect battery. Step 7. Double check for fuel leaks before and after starting the engine. Note: This installation should be done by an experienced mechanic who has access to a factory service manual and all required tools! Please check the fitment section of this listing before you purchase. Please kindly check again your engine volume! This is a non-OEM product, accessory only! Package Included:1 x Fuel Injector
