Star Racing
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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



For 2007-2016 Harley-Davidson Models


(Also available on Twin Cooled)

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


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
  • 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: $4,975

Email for more info and details



Customer Jobs:




107 Mail Order Kit

One Stop

We do the machine work to Your heads & cylinders.

We send you all the parts you need to make your own Thrasher Kit!!

With our Mail Order Kit you get:

  • A set of our "Thrasher 130 HP"  .630 cam set and cam install kit
  • Adjustable pushrods
  • The complete "Thrasher Kit" gasket set including multi- layer stainless steel head gaskets
  • CP forged 107 pistons +3 cc domes 10.4 to 1 compression ratio
  • Custom fit CP rings, precision ground wrist pins
  • We increase the port sizes, increase the port flow capacity by reshaping and resizing the total intake and exhaust systems.
  • We install oversized "Black Diamond" Stainless intake and exhaust valves,
  • We replace the valve guides with high performance bronze alloy.
  • Our "Thrasher Kit” includes NASCAR quality springs, titanium retainers and valve keepers.
  • At Star Racing we bore and hone, your cylinders with torque plates, to the perfect size and finish.

You will need to get the engine built in a professional manner.

The engine will need to be extensively tuned on a load controlled dyno. We will send a “starter map” to get you started.

Price for all above: $2,495.00

*If you install this kit, with options...Boarzilla exhaust, Heavy Breather air cleaner, and a S/E 58mm throttle body

This "Thrasher Kit" will make over 130 rear wheel horse power.


High flow 58mm Throttle Body      $ 480.00

Easy Start cam option                      100.00

S&S "gear drive" cam upgrade         480.00

D&D Boarzilla exhaust                      995.00

Extra "Ghost pipe" for left side         350.00

TTS Master Tuner                              440.00

High flow injectors                            169.00

S/E Heavy Breather air cleaner         369.00


NEW More Power and Lower Cost!!!!!

113" Thrasher Upgrade Kit

For 2007-2016 Harley-Davidson CVO-110 Models

(Also available on Twin Cooled)


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
  • 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 OptionsAvailable, TTS master tuner, Boarzilla exhaust and High flow air filter

Turn-Key Package Price: $5,275.00



Customer Jobs:







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
  • Adjustable Push Rods
  • All Necessary Hardware & Fluids
  • Complete Labor
  • Before & After Dyno Test
  • Options include TTS tuner, Boarzilla exhaust and bigger and better air cleaners
Turn-Key Package Price:  $4,975


98" Thrasher Kit Dyno Sheet


S&S 126

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