World's Largest Aftermarket Motorcycle Parts and Accessories Superstore!


Mikuni HSR42 ‘Easy’ Carburetor Kit

Manufacturer Part Number 42-7

J&P Part: 401-130

13 Reviews


The Gold Club is our premier membership program. For most items members receive 10% off every day, plus exclusive sales and benefits just for members. More Info Gold Club Price: $413.99

Free Ground Shipping

13 Reviews

Shipping & Delivery

Checking availability...

– Order in the next to ship today

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 for Mikuni HSR42 ‘Easy’ Carburetor Kit

This product fits a variety of motorcycles. Please select yours so we can find the right part and guarantee fitment. Select A Motorcycle

Click (+) to view all 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
Out of Stock in Retail Center Anamosa, IA
Out of Stock in Retail Center Daytona, FL
Out of Stock in Retail Center Sturgis, SD
Fast & Accurate Shipping Worldwide
Free Tech
120 Day

Select Your Motorcycle


Get Help From Our Industry Experts

  • Monday-Friday: 7 a.m. - 9 p.m. CST
  • Saturday-Sunday: 8 a.m. - 6 p.m. CST
  • Labor Day: 8 a.m. - 6 p.m. CST
  • Help / FAQs