Read ( 13 ) Reviews

Mikuni HSR42 ‘Easy’ Carburetor Kit

J&P Cycles Part Number: 401-130

Manufacturer Part Number: 42-7


Gold Club Price: $413.99

Checking availability...

– Order in the next to ship today
  • Free Ground Shipping

Description for Mikuni HSR42 ‘Easy’ Carburetor Kit

• Replaces stock CV carb for more power and dependability

• Features a two-piece throttle slide rolling on stainless bearings for much smoother operation

• Benefits include better performance, excellent throttle response, and easier starting

• Pre-jetted and ready to run, per application

• 42 mm carburetor smoothbore Venturi offers great airflow

• Enlarged needle and seat for extended full throttle operation

• Adjustable accelerator pump provides instant throttle response at any RPM

• Light throttle return spring for easy pull operation

• Works with stock manifold and throttle cables

• Kit includes carb adaptor and a chrome air cleaner cover

• High-flow air filter such as 400-639 recommended for maximum performance

Product Specs

Product Specs for Mikuni HSR42 ‘Easy’ Carburetor Kit

Bore Size:
Manufacturer Part Number:
Sold in Units:
Warehouse Part Number:
Fitment Questions?

With over 750 years of experience combined, our tech staff has the answers!

Compatible Models

Harley-Davidson® Models

  • Dyna Low Rider Convertible FXDS-CONV : 1994–1999
  • Dyna Low Rider FXDL : 1993–1999
  • Dyna Super Glide Custom FXDC : 1992
  • Dyna Super Glide FXD : 1995–1999
  • Dyna Super Glide Sturgis FXDB-S : 1991
  • Dyna Wide Glide FXDWG : 1993–1999
  • Softail Bad Boy FXSTSB : 1995–1997
  • Softail Custom FXSTC : 1990–1998
  • Softail Fat Boy FLSTF : 1990–1999
  • Softail Heritage Classic FLSTC : 1990–1999
  • Softail Heritage FLST : 1990
  • Softail Heritage Springer FLSTS : 1997–1999
  • Softail Night Train FXSTB : 1999
  • Softail Nostalgia FLSTN : 1993–1996
  • Softail Springer FXSTS : 1990–1999
  • Softail Standard FXST : 1990, 1999
  • Super Glide FXR : 1990–1994
  • Super Glide FXR2 : 1999
  • Super Glide FXR3 : 1999
  • Super Glide Low Rider Convertible FXRS-CONV : 1990–1993
  • Super Glide Low Rider Custom FXLR : 1990–1994
  • Super Glide Low Rider FXRS : 1990–1991
  • Super Glide Low Rider Sport FXRS-SP : 1990–1993
  • Super Glide Police FXRP : 1990–1994
  • Super Glide Sport Glide FXRT : 1990–1992
  • Touring Electra Glide Classic FLHTC : 1990–1999
  • Touring Electra Glide Sport FLHS : 1990–1993
  • Touring Electra Glide Standard FLHT : 1995–1999
  • Touring Electra Glide Ultra Classic FLHTCU : 1990–1998
  • Touring Road Glide FLTR : 1998–1999
  • Touring Road King FLHR : 1994–1999
  • Touring Tour Glide Classic FLTC : 1990–1992
  • Touring Tour Glide Ultra Classic FLTCU : 1990–1995
Customer Reviews

Customer Reviews for Mikuni HSR42 ‘Easy’ Carburetor Kit

Overall Rating

5 out of 5 stars (based on 13 reviews)

5 stars (11)

4 stars (2)

3 stars (0)

2 stars (0)

1 star (0)

0 stars (0)


installed in few hours what a diference should have done it sooner and the step by step tunning dirrection mad it a snap


I recently purchased and installed on of these carburetors on my 2001 FXDWG. WOW, what a difference. Like some of the other reviews said It pulls like a freight train now. Excellent item at an excellent price. You can't go wrong......

Keith Hertzog

great carb - definitely worth replacing the stock CV you wont be sorry..


Easy instructions and installation. I get more power on my 2000 Heritage Softail.


I think the mikuni carburetor is great. The box came complete with everthing that you need to install it. The directions were clear. It fit without any special modifications. Once installed, it was real easy to adjust the a/f ratio and set the idle. The jets that came with the carburetor are just right for me. Not only did the bike run better over the stock carburetor, but the fuel mileage was better too. It is a great product.


This kit is for 2003 and earlier Sporters with Keihin carburetors that need to be replaced. It requires 2-3534B breather bolts to make it fit 2004-06, and even then the air filter element and the cover must be 2003 to work correctly. The carburetor does deliver better milage and quicker throttle response, and it almost eliminated backfire on my 2005 1200C. Because the accelerator pump stroke is adjustable, it should resolve the backfire issue on almost any Harley. However, for what it took to make it fit, I wish I had chosen the S&S Super E kit instead. BTW, don't call Mikuni and ask for help. They won't talk to you. J&P's staff was far more help to me when the new air cleaner parts didn't fit with the existing parts listed in the instructions.

Bolt on HP! throttle response improved and cold starts as well.


Works Sweet!!!!! Eazy Install Jetted Right On, out of the box for my bad boy....... Thank You


This carb and a cam does wonders.


carb kit worked out as expected as replacement for original cv.carb Love the mikuni ! Smooth throughout the rpm range.


Should have got this carb a long time ago. Brought new life to my Softail. Esy install had all that was needed did not halve to go and buy any thing else, which I like. Just bolted it on and took off, only needed minor adjustment to lean it down. I love this carb, I'm sold. Think I will melt down the CV into something useful like a paper weight. And the throtle response is great.


Runs great!!! Easy to install, awesome carb.


Awesome carb. More fuel and air really made my 883 wake up and scream.

Instructions & Manuals
Important Product Notes

• Will not permit the use of cruise control

• Includes chrome air cleaner cover.

Pickup in our Retail Stores

Get Help From Our Industry Experts

  • Monday-Friday: 7 a.m. - 9 p.m. CST
  • Saturday-Sunday: 8 a.m. - 6 p.m. CST
  • Thanksgiving: Closed
  • Christmas Eve: 7a-5p CST
  • Christmas: Closed
  • Help / FAQs