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 iron lined aluminum cylinders. 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: It is recommended that you upgrade to an adjustable ignition module or ECM tuner to compensate for the added compression of this kit.

Click here for more details about ignitions.

 

Note:  all of our kits use the 2003 and older style cylinders. They bolt up just like the newer cylinders but the fins are slightly smaller. In our experience this does not cause any extra heat and most folks cannot tell the difference when installed. Pictured below is a NRHS 1250 kit with 2007 XL 1200 heads.

 

 

 

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

 

Options to Make These Kits Even Better!

 

If your bike is over 2 years old or has more than 4,000 miles, you should consider upgrading to a full Cometic top end gasket kit. These kits include all rocker box, head, base, pushrod, intake and exhaust gaskets.

 

If you would like NRHS to gap your rings and pre-install your assembled pistons into pre-lubed cylinders you can also order that below.

 

Ordering Information

 

NOTE: GASKET KIT UPGRADE IS ONLY AVAILABLE WITH 1250 CONVERSION KIT PURCHASE!

 

 

Description Part Number Price  

Top End Gasket Kit Upgrade

 

2004-2006 XL's

88-C9971-U

$50.00

Top End Gasket Kit Upgrade

 

2007 and up XL's

88-C9177-U

$50.00

Ring gap and pre-install pistons

116-007

$1.00

 

 

 

 

88" and 90" 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 either Axtell  iron lined aluminum or all cast iron cylinders,  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 and up 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 and up XL1200 Heads

Black Highlighted

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

 

 

 

90" 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. Note: case boring is required for installation.

 

Description

Black

90" Kit for XB/2004 XL 2004 and up 1200 Heads

3.875 bore Axtell cast iron cylinders

10.5:1 pistons, pins, clips, rings

head and base gaskets

004-NACI3875XL04K-B

$890.00

 

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 $1100. 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

All Black or Black w/  Highlighted Fins

Silver

 

Stage 1 engine kit, 1250cc

3.563 bore NRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

Stage 1 head prep (send us your stock heads)

Complete Top End Gasket Set

005-NR3515XL04S1EK

$1250.00

Stage 2 light engine kit, 1250cc

3-9/16 bore NRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

Stage 2 light head prep (send us your stock heads)

Complete Top End Gasket Set 

Matching Street Performance Camshafts

005-NA3563XL04S2EK-H

$1765.00

005-NA3563XL04S2EK

$1765.00

Stage 2 std engine kit, 1250cc

3-9/16 bore NRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

Stage 2 std head prep (send us your stock heads)

Complete Top End Gasket Set

Matching Street Performance Camshafts

005-NA3563XL04S2EK-SH

$1865.00

005-NA3563XL04S2EK-S

$1865.00

Stage 3 engine kit, 1250cc

3-9/16 bore NRHS iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

Stage 3 head prep (send us your stock heads)

Complete Top End Gasket Set

Matching Street Performance Camshafts

005-NA3563XL04S2EK-BH

$2015.00

005-NA3563XL04S2EK-B

$2015.00