Harley Davidson Mikuni HSR45mm Easy Kit Twin Cam (1999 to present), Big Twin (1990-1999), choke cable, air box adapter,

45-5: Mikuni Easykit 1999 to present Harley Davidson Twin Cam, 1990 to 1999 Harley Davidson Big Twin Evo. Includes 45mm carb with choke cable, air box adapter, instructions. For the maximum available increase in all round performance and power available, this kit will instantly impress.

Twin Cam (1999 to present), Big Twin (1990-1999)

As this carburetor has a larger spigot diameter than the stock item and will not fit into your manifold, you must use a H-D Screamin’ Eagle Manifold Kit or better still either a Mikuni HS42/061-45 Evo or Hs42/061-45TC Twin Cam Manifold which are for use on all engines with stock length cylinders. When fitted along with the also purchased here separately HS42/062-45 mounting flange it will position the HSR so as not to protrude out any further than stock with the benefit of better carburetor heat isolation, more secure mounting and a 2 to 3 HP gain over the standard item.

It is always recommended to replace your manifold to head o-ring gaskets when fitting a new manifold. 

For fitment of S&S Shorty air-cleaners to a Mikuni HSR carb, some material will need to be ground off the outer edge of the S&S backing plate to allow for clearance giving total unimpeded movement of the return arm on the carburetor. See the picture showing the required modification.

Links

• https://speedmotoco.com/hs42-062-45-mikuni-flange-mounting-hsr45-to-mikuni-manifold/
• https://speedmotoco.com/hs42-061-45tc-alloy-manifold-for-twin-cam-models-rubber-flange-not-included/

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