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Upgrade Kits for Stock Harley-Davidson Motorcycles

Call 800-841-STAR or E-mail for more information.



113" Thrasher Upgrade Kit

For 2007-Current Harley-Davidson Models

We finished our 1st 113” Thrasher Kit on a NEW 2013 110” CVO Harley-Davidson Road Glide.

This motorcycle came to us with only 90 horsepower, and we added 51 more!

Now it’s WAY more fun to ride!

We bored it to 113 cubic inches at 10 to 1 compression ratio. We installed our custom pistons, custom ground cams with oversize valves, roller rockers and ported the heads to add 51 more rear wheel horsepower!

We finished with just over 140 RWHP and just over 129 ft. lbs. of torque!

Please call Star Racing for more info on this 113” Thrasher Kit!
This is the way Harley should sell them!

Call 800-841-7827 to make an appointment.

Included in the package:

  • Cylinder Heads - Pro Ported & Machined
  • Cylinders - Bored & Honed With Torque Plates
  • Oversized Valves - Intake & Exhaust
  • Performance Valve Spring Kit
  • 113 CVO twin cam piston kit
  • SE Pro high flow injector kit
  • Camshaft installation kit
  • Cam drive gear kit
  • Roller rockers
  • Pushrod kit
  • TTS MasterTune kit
  • MLS Head Gaskets
  • FBW 58 mm throttle body
  • Manifold
  • Gear drive cam set
  • All Necessary Hardware
  • Fluids, Filter & Plugs
  • Complete Labor
  • Before & After Dyno Test
  • Custom Dyno Map
  • Other Options Available
Turn-Key Package Price: $5,995

We Gained 51 Horsepower with this 113" kit!


BIG 107" UPGRADE KIT

For 2007-Current Harley-Davidson Models

AVAILABLE FOR STOCK HARLEY® TWIN CAM 96 C.I. ENGINES
GO FROM 68 TO OVER 120 REAR WHEEL HORSEPOWER

The 107” upgrades offered by Star Racing delivers more bang for your buck than any other upgrade on the market. Our performance packages typically produce 120+ horsepower depending upon your current exhaust system.  Installation of the kit maintains the appearance of a stock engine, but you will definitely feel the difference!  Finally, your bike will be the fastest and your buddies will be scratching their heads trying to figure out what you have done.  One work week turnaround (dependent upon throttle body replacement).

Call 800-841-7827 to make an appointment.

Included in the package:
  • Cylinder Heads - Pro Ported & Machined
  • Oversized Valves - Intake & Exhaust
  • Bronze Alloy Valve Guides
  • Performance Valve Spring Kit
  • 600 Lift Cams
  • CP +3cc Pistons
  • Cylinders - Bored & Honed With Torque Plates
  • Cam Bearings
  • Race Tuner
  • K&N High Flow Air Filter
  • Big Bore 58mm HD
    Throttle Body
  • Adjustable Push Rods
  • All Necessary Hardware
  • MLS Head Gaskets
  • Fluids, Filter & Plugs
  • Complete Labor
  • Before & After Dyno Test
  • Custom Dyno Map
  • Other Options Available.
Turn-Key Package Price: $4,895

 

Want to see more of what the Thrasher kit can do for your bike?

Click the links below to see more dyno sheets from real Star Racing customers!

Think you have enough hp with the 106 Kit?

Check out this customer who gained over 30 hp when switching from the 106 to the 107 Kit!

Click to view larger


New Partnership with Gruene Harley-Davidson

We've partnered with Gruene Harley-Davidson in New Braunfels, Texas, to offer customers

brand-new, Star Racing-modified Harleys STRAIGHT off the showroom floor! With our

107 Thrasher Upgrade Kit, dyno tuning and other upgrades, these bikes are much more fun to ride!

We took a new 2013 Road Glide from 60 horsepower to over 120!

Call Star (800-841-7827) or Gruene (830-624-2473) for more information.

 


Twin Cam 98" Harley Thrasher Kit

For 1999-2006 Harley-Davidson Models

A stock twin cam Harley has around 64 horsepower and about 75 foot pounds of torque.  The Star Racing Thrasher Kit increases the horsepower on average to 100+ and the torque to 96 foot pounds.  Turn around time is typically one week, two weeks maximum, so you will be back on the road in no time!

Since 1980, Star Racing has been dedicated to providing its customers with the best in motorcycle performance and reliability and is pleased to announce the availability of the Thrasher Kit for your 1999 to 2006 twin cam Harley®.  This kit is a Star exclusive that increases the performance of your motorcycle while maintaining the stock appearance and reliability.

The Star Racing Thrasher Kit has been designed to work with the stock clutches, starters, and all other Harley Davidson parts while maintaining ease of drivability and running on today’s pump gas.

Before and after dyno runs are performed on each bike so you may monitor the progress in performance.  This means you not only feel the power, you can see it too!

Included in the package:
  • Heads - Pro Ported & Machined
  • Oversized Valves - Intake & Exhaust
  • Cams
  • Pistons
  • Cylinders – Bored & Honed
  • Ignition
  • Cam Bearings
  • 42mm Mikuni Carburetor/Race Tuner
  • Air Breather
  • Adjustable Push Rods
  • All Necessary Hardware & Fluids
  • Complete Labor
  • Before & After Dyno Test
   
Turn-Key Package Price:  $4,895

 

98" Thrasher Kit Dyno Sheet

 
 

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