EFI Injection to Mikuni HSR 48 Conversion Kit, Harley Davidson Twin Cams

$1,775.00 AUD$1,795.00 AUD

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This Mikuni Carburetor kit is for converting to a high performance carburetor, Harley Davidson Twin Cam models using the earlier Magneti Marelli or throttle cable operated Delphi injection systems.

We do not have a video at present but there are numerous YouTube videos out there on the procedures for the gas tank preparation and the fitting of the Thunder Heart ignition when doing this conversion, which are a good indicator for seeing whats involved.

The following kit components are included:

Mikuni HSR Total Kit 48-4 for 1999 to present Harley Davidson Twin Cam 115cui and larger Bigtwin Models. For the maximum available increase in all round performance and power available, these kits are complete with everything needed for a total installation. Kits include a Mikuni HSR 48mm carburetor, a Mikunioz upsized large plenum manifold with oversize (1.880” O.D.) spigots (matching rubbers need to be purchased elsewhere), rubber flange, 3″ wide maximum high flow K&N Filter, chrome cover, breather kit and mounting hardware. A new up-graded choke cable is provided and simply connect up your stock throttle cables. Both the air-cleaner element and manifold will deliver an additional performance improvement over the Screaming Eagle equivalents. It is always recommended to replace your manifold to head o-ring gaskets when fitting a new manifold. Sorry not available through Mikunioz.

This specially designed Mikunioz manifold positions your carb and air-filter in as close to the motor as possible whilst enhancing maximum performance. There is a range of manifold lengths available depending on the engine size and configuration, where please contact us for conformation.

Stainless steel Gas tank fittings and Hi-Flow Fuel Petcock. The gas tank adapter and plug sets differ between the early Magneti Marelli Tanks with an 18mm plug for blanking off the no longer required EFI return port and a 3/4″ x 16TPI thread on the petcock fitting. These are the ones pictured with the red washers (Loctite 567 Sealant required) and an inline fuel filter needs to be purchased separately along with your new fuel line of choice as the adapter inside diameter negates the space for a petcock screen. The same applies to the two Delphi options where the earlier tanks require a second 22mm plug and the later just the petcock adapter.

Thunder Heart Ignition System:


All international buyers are responsible for the payment of their domestic customs duties and taxes charged on imported goods. The duty free threshold and duty/taxes payable rates differ from one country to another and we strongly advise you check your liability before ordering if unsure. Please check your tracking on all international shipments within 7 days to follow their progress and determine if it is being held by your local customs dept. or on their behalf by the Postal Service, who you will need to make contact with using the provided tracking number.

Please Note: Other than exact replacement OEM carburetors, all Mikuni Aftermarket Carburetors and Tuning Components are sold “As Is” for Off Road / Racing Use Only and are not intended or approved for use on vehicles operated on Public Roads or in locations where applicable engine tampering and anti-pollution laws apply.


Additional information

Select Your Kit

Magneti Marelli, Delphi 2 Tank Adapters, Delphi Single adapter


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