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Home > 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

    Price:$330.00

     
    Polished or Standard Finish:
      Maxair Custom Road Star Premium choke cable (Installed) +75 (**Required Item)
    Custom Barnett: RoadStar to 42 HSR Throttle cables Set of 2 (**Required Item):
      Maxair HellCat 42 Jetting Kit (Installed for your application) +75 (**Required Item)
    HellCat TPS MOD (Required Item):
      Short Idle Adjust knob -Optional (Won't Damage Pushrod Tubes!) (Installed) +25
    Fuel Pump setup or Pumpless (Required choice):
      Yost PowerTube - Installed (optional - even better throttle response!) +$65

     
    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.

    The HellCat is a turnkey solution!

    • Options
       
      • Standard or Polished Finish
         
      • The Maxair HellCat Choke cable (available OEM or any length -with a polish aluminum knob)
         
      • 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 even have the Economical Standard Black Vinyl or the Premium Stainless versions.
         
      • Maxair HellCat 42 Jetting Kit (Max professionally jets the Carb. to your setup- Turnkey !!)
         
      • TPS MOD 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
           
      • No Pump MOD - Complete kit for Eliminating Your OEM Fuel Pump (click here for more info)
         

      We install the Jet Kit, TPS Mod. & Choke, 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  to options are purchased .

    "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 HellCat 42 Carburetor for the Yamaha RoadStar - FAQ

     

    • What is the Maxair HellCat 42 and why should I purchase it for my RoadStar : The Maxair HellCat 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, but we have provided the Maxair HellCat as a turnkey solution!
       
    • I have heard about going pump-less vs. using the OEM fuel pump what's the difference. Pump-less is the way to go! When using our No Pump Mod there is no downside and the upside is never having to worry about your fuel pump dying, leaving you stranded on the side of the road! This must be done correctly however, to avoid fuel starvation issues. Our No Pump Mod kit will do the job right!

      If you decide to run your stock fuel pump, you'll need the optional float needle in the options. We install that for you! 
       
    • What is the TPS Mod.?   This is a modification we do in house to allow your stock TPS  (throttle position sensor) to work with the 42. This greatly improves throttle response performance and gas mileage. 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 ? Max professionally jets the Carb. to your setup- Turnkey !! 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 HellCat 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 HellCat 42 different:  The Maxair HellCat 42 is designed to be turnkey 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.
       
    • Will 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 and is prone to engaging on its own, causing gas mileage problems, so we have design a superior choke for this application. If you have a question about the length let us know and we'll walk you through the measurement process.

     


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

     

    • Maxair HellCat 42 Jetting Kit ( Max professionally jets the Carb. to your setup- Turnkey!)
    • 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 HellCat 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
     
    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
     
    NO_PUMP_MOD No Fuel Pump Mod - 1999-2007 Yamaha RoadStar Complete Kit $199.00
     
    MAX-RAIDER-CABLE FlameWires X2 Series : Yamaha Raider - Replacement Battery / Starter Cables !!! $79.99
     
    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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