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Upgrade Kits for Stock Harley-Davidson Motorcycles

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

Our Thrasher series, engine packages are the most powerful and reliable available.

Scroll below

To find updated information on ehancements we offer for your stock 88, 96, 103 ,110

 



NEW More Power and Lower Cost!!!!!

113" Thrasher Upgrade Kit

For 2007-2015 Harley-Davidson Models

3 years of continuous research and development has uncovered 10 more foot pounds of rear real torque and 600.00 less dollars to boot!!

We finished our newest updated design 113” Thrasher Kit on a NEW 2014 110” CVO Harley-Davidson Road Glide.

This motorcycle came to us with only 90 horsepower, and we added 50 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, and ported the heads to add 50 more rear wheel horsepower! Not just a "port and polish" job! But, a big change in shape and size to flow enough air to make 140 HP. We finished with just over 140 RWHP and just over 140 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.

 

We Gained 50 Horsepower with this 113" kit!

Included in the package:

  • Cylinder Heads - Pro Ported & Machined
  • Cylinders - Bored & Honed With Torque Plates
  • Oversized Valves - Intake & Exhaust
  • Performance Valve Spring Kit
  • Titanium Retainers
  • 113 CVO twin cam CP piston kit
  • SE Pro high flow injector kit
  • Custom ground cam kit
  • Camshaft installation kit
  • S&S adjustable Pushrod kit
  • TTS MasterTune kit
  • MLS Head Gaskets
  • FBW 58 mm throttle body
  • Manifold modified to flow
  • S/E clutch upgrade
  • All Necessary Hardware
  • Fluids, Filter & Plugs
  • Complete Labor
  • Before & After Dyno Test
  • Custom Dyno Map
  • Other Options Available

Turn-Key Package Price: $5,395

 

Other Jobs:

 

 


BIG 107" UPGRADE KIT

For 2007-2015 Harley-Davidson Models

AVAILABLE FOR STOCK HARLEY® TWIN CAM 96 C.I. to 103 C.I. ENGINES

New improved Head flow has offered even more power for the same money!!!!!

GO FROM 70 TO OVER 130* 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 130+ 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). *When used with D&D Boarzilla exhaust.

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 10.4 to 1 pistons
  • Cylinders - Bored & Honed With Torque Plates
  • Cam install kit
  • 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.
  • Options include, TTS tuner, Boarzilla exhaust, bigger and better air cleaners

 

Turn-Key Package Price: $4,795

Email George@starracing.com for more info and details

 

 

 


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 118+ and the torque to 100 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
  • Custom Cams
  • CP forged Pistons
  • Cylinders – Bored & Honed
  • Cam Bearings
  • 58mm Throttle Body
  • Air Breather
  • Adjustable Push Rods
  • All Necessary Hardware & Fluids
  • Complete Labor
  • Before & After Dyno Test
  • Options include TTS tuner, Boarzilla exhaust and bigger better air cleaners
   
Turn-Key Package Price:  $4,795

 

98" Thrasher Kit Dyno Sheet

 
 

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