2004 & UP SPORTSTER Engine Kits

THE 1250cc BOLT-ON BIG BORE KIT FROM NRHS: MAKE YOUR NEW SPORTY A BIG BORE WITHOUT THE BIG EXPENSE! From $699.95

Now that you've got the best looking and most technically advanced Sportster in history in your garage, NRHS wants to help make your new XL run as good as it looks with the introduction of our 1250cc bolt-on big bore kit. Filled with premium components, this kit is the perfect foundation on which to build your American hot-rod,  and best of all, no case boring is required for installation! Each of these kits includes a pair of premium quality cylinders in your choice of iron lined aluminum or all cast iron. Our testing has shown these cylinders are superior in both ring seal and longevity to any other cylinder of the same type on the market. Also included is a set of premium quality NRHS Hurricane forged pistons with tool steel wrist pins, Total Seal rings, and Cometic EST gaskets. Take your Sporty to the next level with a bolt-on big-bore kit from NRHS! 

 

Note:  all of our kits use the 2003 and older style cylinders. They bolt up just like the newer cylinders but the fins are slighly smaller. In our experience this does not cause any extra heat and most folks cannot tell the difference when installed.

 

Ordering Information

1250 Kits With NRHS Iron Lined Aluminum Cylinders (shown above)

Iron Lined Aluminum construction offers greater structural integrity with good heat dissipation and excellent ring seal.

Description

Black w/Highlighted Fins

          Black

Silver

1250cc Bolt-on kit

3-9/16 bore iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

head and base gaskets

004-NAIL3563XL04K-BH

$699.95

004-NAIL3563XL04K-B

$699.95

004-NAIL3563XL04K-S

$699.95

 

 

1250 Kits With Axtell Cast Iron Cylinders (shown above)

Cast iron construction offers the ultimate in structural integrity and ring seal.  Cylinders come only in black baked finish. Fin highlighting is not available. Powder coating is available for an additional $100.00

Description

Black

1250cc Bolt-on kit

3-9/16 bore Axtell cast iron cylinders

10.5:1 pistons, pins, clips, rings

head and base gaskets

004-NACI3563XL04K-B

$820.00

 

 

 

 

 

88" BIG BORE KITS FOR THE 2004 & UP SPORTSTER

 

Turn your new XL into the absolute nastiest hot-rod around! These kits take your Sporty out to the maximum bore size you can get in your stock cases. Of course, this engine kit comes with the finest quality components money can buy: Kit includes Axtell iron lined aluminum,  matching forged Hurricane pistons with tool steel wrist pins, Total Seal rings, and Cometic EST gaskets! Note: case boring is required for installation.

 

88ci Kits With Iron Lined Aluminum Cylinders

For those who want light weight, good heat dissipation, and and more structural integrity we now offer 88" Axtell cylinders in aluminum with a cast iron sleeve.  These cylinders are built to last with heavy duty ribs in the cooling fin areas. Other powder coat colors available, please call for details.

Description

88ci Big Bore Kit for XB/2004 XL1200 Heads

Silver

3-13/16 bore Axtell iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

head and base gaskets

(case boring required)

004-NR3813CIXB12S-SH

$1220.00

88ci Big Bore Kit for XB/2004 XL1200 Heads

Black

3-13/16 bore Axtell iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

head and base gaskets

(case boring required)

004-NR3813CIXB12S-BH

$1220.00

 

 

 

Performance tip: Although the XB/'04 XL1200 head is a better piece, Thunderstorm type pistons use an angled squish band that improves chamber efficiency over the flat bathtub style used in the XB heads. For the optimum in performance, let NRHS cut a 15 degree squish band into your XB/'04 XL1200 heads and match this up to a Thunderstorm engine kit.


ARE YOU READY FOR THE POWER THAT ONLY PORTED HEADS CAN PROVIDE? AN NRHS STAGE 1/2/3 BOLT-ON KIT IS THE ANSWER!

From $1075. 00

 

The NRHS 2004 XL Stage 1/2/3 kits are matched packages that are proven on the dyno and on the street to work exceptionally well together. Buying a matched package takes the guesswork and error out of your project!

 

Not seeing what you want? Give us a call! We have tremendous experience at hot-rodding and racing XL's and we'll be happy to put together a package that works for you.

  

Description

Black with  Highlighted Fins

04 and up 1200r heads

Silver

XB heads

 

Stage 1 engine kit, 1212cc

Bore & hone your cylinders to 3.515”

10.5:1 pistons, pins, clips, rings

Stage 1 head prep

Complete Top End Gasket Set ($50 extra 2007 and up models)

005-NR3515XL04S1EK

$1075.00

Stage 2 light engine kit, 1250cc

3-9/16 bore NRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

NewXB or 04 1200R heads with Stage 2 light head prep

Complete Top End Gasket Set 

Matching Street Performance Camshafts

005-NA3563XL04S2EK-H

$2425.00

005-NA3563XL04S2EK

$2550.00

Stage 2 std engine kit, 1250cc

3-9/16 bore NRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

New XB or 04 1200R heads with Stage 2 std head prep

Complete Top End Gasket Set

Matching Street Performance Camshafts

005-NA3563XL04S2EK-SH

$2525.00

005-NA3563XL04S2EK-S

$2650.00

Stage 3 engine kit, 1250cc

3-9/16 boreNRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

New XB or 04 1200R heads with Stage 3 head prep

Complete Top End Gasket Set

Matching Street Performance Camshafts

005-NA3563XL04S2EK-BH

$2775.00

005-NA3563XL04S2EK-B

$2900.00