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Home > Shop by Bike > Yamaha RoadStar > The Maxair HellCat : Mikuni 42 Flat Slide HSR Carburetor - Yamaha Road Star

 

The Maxair HellCat Carburetor Kit:

This beast lies under your tank quiet and unimposing....until challenged !! Then with the flick of your wrist, the chains are off and the chase is on!!!

With the Maxair HellCat Carburetor Kit enjoy OEM  drivability, gas mileage and longevity.  Simply twist the throttle to let this beast out of its cage and hang on!!!

 


The Maxair HellCat : Mikuni 42 Flat Slide HSR Carburetor - Yamaha Road Star
 
The Maxair HellCat : Mikuni 42 Flat Slide HSR Carburetor - Yamaha Road Star Quantity in Basket: None
Code: MAX_HSR_42

Regular Price:$330.00
Sale Price:$299.00

 
Polished or regular finsh:
Custom Barnett: RoadStar to 42 HSR Throttle cables Set of 2:
  Maxair Custom Road Star Premium choke cable (Installed) +75
  Maxair HellCat 42 Jetting Kit (Installed for your application) +75
  Modification to mount YOUR stock TPS (we need your TPS mailed to us) +125
  New OEM TPS (Does NOT include TPS MOD -**ONLY If you cannot send us yours) +168
  Short (Won't Damage Pushrod Tubes!) Idle Adjust knob (Installed) +25
  Yost PowerTube (Installed) +61
  No Fuel Pump Mod - 1999-2007 Yamaha RoadStar Complete Kit +195
  Special float needle valve/seat set- to run stock fuel pump (Installed) +35
 
Quantity:

 

 

Click Tabs Below For More Info

Scroll  to the Bottom for Testimonials

  Product Information |Video | FAQ Page | Options |Technical Support

Our Maxair HellCat Mikuni 42 HSR Flat Slide Carburetor is the difference between a "REAL" carburetor vs. the stock OEM "toy" carburetor. Get the power and throttle response that a flat slide carburetor can offer from people who run them on the Yamaha Road Star every day.

This carburetor setup provides comparable gas mileage as well as great drive-ability. There is nothing to lose and superior performance & throttle response to gain.

You canít just bolt up the 42 to the RoadStar without some extras and enhancements. We provide everything you need to make this a turn key mod. 

    • Options
       
      • Maxair Racing 42 Jetting Kit ( Our jet kit will have everything you need)
         
      • Modification to Mount OEM TPS (we need your TPS mailed to us: Video)
         
      • Shorter non- flexible Idle Speed Knob ( This shorter version will not damage your push-rod tubes)
         
      • Running OEM Fuel pump:
        • Special float needle valve/seat set- to run stock fuel pump
      • The Maxair 42 Choke cable (available OEM or any length -with a polish aluminum knob)
      • No Pump MOD - Complete kit for Eliminating Your OEM Fuel Pump (click here for more info)
      • Maxair Throttle cables by Barnett: You will also need to swap your cables for the Barnett cables with the appropriate ends for this application. (We sell those here also- see related products below. We even have the economical standard black or the premium stainless versions.

      When purchasing the 42 Carb., Jet Kit, TPS Mod. & Choke together we will install all the parts, adjust the float level and install stainless steel allen (socket head) float bowl screws and set the carb up ready to install. We will also install the Yost PowerTube & Float Needle if purchased at the same time as those items.

"My Brother and I both run these 42s with the TPS mod. This is like taking off a toy and putting on a real carburetor. Simply one of the best "must have" performance mods. you can do to you can do to your Road Star.

My brother runs the his on the 2003 Road Star with the fuel pump and mine is the 2004 newer design running without the fuel pump. We know both setups well. We have everything you need to do this upgrade right the first time!!!"

Max


 

 

 


 


Maxair Racing 42 Carburetor for the Yamaha RoadStar - FAQ

 

  • What is the Maxair Racing 42 and why should I purchase it for my RoadStar : The Maxair Mikuni 42 HSR Carburetor is a premium flat slide carb. that allows maximum flow and power gains. This kit has become well known among Road Star aficionados, as the must have for the best power, while retaining real world drivability.
     
  • Can I just install the basic 42 without anything else? No, at the very minimum you will need our Maxair spec Barnett throttle cables.
     
  • I have heard about going pumpless vs. using the OEM fuel pump what's the difference.  Some people choose to remove the OEM fuel pump to run pumpless This is Max's preference. The only reason for this is to eliminate the fuel pump and simplify your bike. One less part than can fail. This must be done correctly to avoid fuel starvation issues. You'll need the Hi Flow Pingle fuel petcock & the Hi Flow Pingle fuel filter. The Pingle petcock requires a minor enlargement of the fuel outlet hole which is easily done with a round file.

    Using your OEM fuel pump is the simplest way to go. In this case you'll simply need the optional float needle setup in the options.
     
     
  • What is the TPS Mod.?   This is a modification we do in house to allow your OEM TPS ( throttle position sensor to work with the 42. This greatly improves throttle response performance and gas mileage. We strongly recommend this mod. We'll need you to send us your TPS for this modification. You can still run your bike during this time without a TPS
     
  • How will I know what jetting to use ?  If you Purchase the optional jet kit from us we'll do that for you. We'll simply ask you what your bikes specs (pipe, air kit, engine mods etc.) are, along with other information such as elevation and make a determination based on that and the data we have. We include a Maxair 42 Quick Start guide with all the options installed. Most of our customers simply install the carb. and they are done. Some will need minor tweaking. We have a private tech support forum dedication to this process.
     
  • How is the Maxair 42 different:  The Maxair 42 is designed to be turn key with the ability to purchase all options in one automated process. We then include our expertise in setting up the carburetor for your Road Star as well as the in house TPS mod. We have proven that despite the term Racing carb you can get great gas mileage and drivability with this upgrade.
     
  • While the 42 choke work with my bike or should I order your custom choke.  The 42 choke is too short to reach the stock choke position so we recommend getting our high quality choke which can be made to any length. If you have a question about the length let us know and we'll walk you through the measurement process.

 


Maxair Racing 42 Carburetor for the Yamaha RoadStar - Options (See FAQ tab for more info.):

 

  • Maxair Racing 42 Jetting Kit ( Our jet kit will have everything you need)
  • Modification to Mount OEM TPS (we need your TPS mailed to us: Video)
  • Shorter non- flexible Idle Speed Knob ( This shorter version will not damage your push-rod tubes)
  • Running OEM Fuel pump:
    • Special float needle valve/seat set- to run stock fuel pump
  • The Maxair 42 Choke cable (available OEM or any length -with a polish aluminum knob)
  • No Pump MOD - Complete kit for Eliminating Your OEM Fuel Pump (click here for more info)

When purchasing the 42 Carb., Jet Kit, TPS Mod. & Choke together we will install all the parts, adjust the float level and install stainless steel allen (socket head) float bowl screws and set the carb up ready to install. We will also install the Yost PowerTube & Float Needle if purchased at the same time as those items.


At Maxair Engineering we pride ourselves on having the best support in the technical support industry! Since most of our customer install this product themselves we have earned a reputation for fast reliable technical support. .

Technical support for the Maxair 42 Flat Slide HSR can be found on our Technical Support forum: The Maxair Garage

The Maxair Garage is a private technical Support forum for customers to receive technical support and expertise. You will find all the help and information you need. There are links, videos and much more to assist you though the install.

  

Screen-Shot of the Maxair Garage Technical Support forum


One of the best add-ons I have done. I do suggest having Maxair jet the carb, install your TPS, and add the short idle screw. The installation was a breeze after that. Maxair helped me to get the correct cables and tech department worked with me to ensure my bike was up and running. It is now flying like a champ, this carb is soooo much better then the stock CV. Should have done this years ago. I will be a Maxair customer for life due to the fantastic customer service. Thanks!!! Customer: Craig Comeaux (Williamsburg, Virginia)

 


 


 

           



Related Item(s)
Code Name Image Price Availability    
MAX_RS_42_CABLE-PUSH_and_PULL SET OF TWO : Barnett Custom Throttle Cable for the 42,45 or 48 HSR- Yamaha Road Star - Stainless or $120.00  
RS_CHOKE_CABLE Yamaha Road Star OEM & HSR 42 Carb. Performance choke cable $82.00  
RS_PINGLE Pingle High Flow Petcock-Yamaha Road Star $138.00  
PINGLE_FUEL_FILTER Pingle High Flow fuel Filter $45.00  
BAR_RSTR_FRIC Barnett Replacement Clutch Plates -Road Star 1600 & 1700 ( Not Warrior) $155.00  
CBLR_RPR The New Maxair Emergency Cable Repair Kit for Yamaha V Star 1100 & RoadStar $25.99  
Customer Testimonials
Average Customer Rating: 5 out of 55 out of 55 out of 55 out of 55 out of 5 8 Testimonials
Write an online testimonial and share your thoughts with others.

5 out of 55 out of 55 out of 55 out of 55 out of 5 I LOVE IT it's wicked, 9.17.2014
Customer: Chad Gurley (Tucson , AZ)

Got it all together today max everything worked out great she runs awesome!! We just got back from the first ride since the 42 I LOVE IT it's wicked thanks again .. Chad

 

5 out of 55 out of 55 out of 55 out of 55 out of 5 LOVE IT, LOVE IT, LOVE IT., 11.19.2012
Customer: Bill Delaney (Pahrump, NV)

I just insatalled the carb. WOW the bottom & mid range is terrific. The bike has come to life. LOVE IT, LOVE IT, LOVE IT.

 

5 out of 55 out of 55 out of 55 out of 55 out of 5 waited too long, 10.4.2012
Customer: andy (new salem, pa)

Stock carb got me 30-33 mph. Above 6000' it was useless without a rejet. This carb gives me not less than 37 mph with a lot more power. Took it west and at 14000' got 48mpg. Don't wait any longer just do it.

 

5 out of 55 out of 55 out of 55 out of 55 out of 5 What a difference!, 2.2.2012
Customer: Mike Moreland (Danville, Ohio)

5 Stars for Maxair! Installed my HSR 42 and my bike sounds like a new machine! The settings were spot on and all I needed to adjust was the idle. Max made my purchase effortless and carefree from day one! Great customer support throughout. Thanks Max!

 

5 out of 55 out of 55 out of 55 out of 55 out of 5 Things could not have been simpler!, 12.5.2010
Customer: Lyle Kohler (Oxenford, QLD, Australia)

Just received the Mikuni 42, fitted last night and Bike ran great first start. Thanks for your help, much appreciated. Things could not have been simpler!

 

View all 8 Testimonials

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