1986-2003 SPORTSTER Engine Kits


AN INDUSTRY STANDARD: THE NRHS BOLT-ON 1250 KIT FOR EVOLUTION SPORTSTERS

 

Now available with your choice of iron lined aluminum, or full cast iron construction cylinders!

From $699.95

 

We’ve sold literally thousands of these kits since their introduction in 2001. Why do they sell so well? BECAUSE THEY WORK! Customers report huge increases in torque and horsepower, as well as longevity and reliability and without the expense and down-time of other big bore kits because no case boring is required for installation! And now we're proud to offer this kit with your choice of premium quality NRHS iron lined aluminum,  or Axtell full cast iron construction cylinders. Our testing has shown superb ring seal, power, and longevity with each of these kits. Each of these kits also includes top quality NRHS Hurricane forged pistons and tool steel wrist pins, Total Seal rings, and Cometic EST gaskets. Give your Sportster the BEST parts money can buy: the bolt-on big bore kit from the inventor of the 1250 kit, NRHS! Kits are available for XL1200, XL1200S, Thunderstorm, and XB/'04 XL1200R heads.

 

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

Silver

1250cc Bolt-on kit for XLH1200 Heads

3-9/16 bore iron lined aluminum cylinders

10.5:1 pistons, pins, clips, rings

head and base gaskets

also for 1995-1996 Buell S2/S2T models

004-NAIL3563XLK-BH

$699.95

004-NAIL3563XLK-S

$699.95

1250cc Bolt-on kit for XL1200S Heads

3-9/16 bore iron lined aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NAIL3563XLSK-BH

$699.95

004-NAIL3563XLSK-S

$699.95

1250cc Bolt-on Kit for Thunderstorm Heads

3-9/16 bore iron lined aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NAIL3563TSK-BH

$699.95

004-NAIL3563TSK-S

$699.95

1250cc Bolt-on kit for XB/2004 XL1200 Heads

3-9/16 bore iron lined aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NAIL3563XB12SK-BH

$699.95

004-NAIL3563XB12SK-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 for XL1200 Heads

3-9/16 bore Axtell cast iron cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

also for 1995-1996 Buell S2/S2T models

004-NACI3563XLK-B

$820.00

1250cc Bolt-on kit for XL1200S Heads

3-9/16 bore Axtell cast iron cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NACI3563XLSK-B

$820.00

1250cc Bolt-on Kit for Thunderstorm Heads

3-9/16 bore Axtell cast iron cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NACI3563TSK-B

$820.00

1250cc Bolt-on kit for XB/2004 XL1200 Heads

3-9/16 bore Axtell cast iron cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NACI3563XB12SK-B

$820.00

 

 

Performance tip: Although the XB/'04 XL1200 head is a better piece, Thunderstorm type pistons use a superior 15 degree angled squish band arrangement. For the optimum in performance, let NRHS cut a 15 degree squish band into your XB/'04 XL1200 heads and use a Thunderstorm engine kit.

 

An NRHS/Axtell 1250 kit and Stage 2 XL1200R heads shown installed

on a Buell S2 owned by Sam Matteo

 

Right side


FOR THE ULTIMATE POWER FROM YOUR SPORTSTER: THE NRHS 88" KIT FOR EVOLUTION SPORTSTERS!

 

This kit is not for the faint of heart! Your Sportster will surprise and amaze you with the torque and horsepower these kits produce. Power is right there for the taking, it comes on early and often. Tuned properly, the engine’s reliability and longevity is actually enhanced in the process due to the premium quality  Axtell aluminum cylinders with cast iron sleeves,  NRHS Hurricane forged pistons and tool steel wrist pins, Total Seal rings, and Cometic EST gaskets found in this kit. You can’t buy a better kit for your Sportster, anywhere at any price! Note: This kit requires the engine to be disassembled and the cases to be bored

 

88ci Kits With Axtell 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 iron lined aluminum construction  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 Thunderstorm 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-NR3813CITSK-SH

$1220.00

88ci Big Bore Kit for Thunderstorm 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-NR3813CITSK-BH

$1220.00

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

All 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.

 

GET A COMPLETE MATCHED PACKAGE WITH AN NRHS STAGE 1/2/3 POWER KIT!

From $1500.00, includes NEW 04 and up 1200 Heads

Don’t mess around with poorly matched components, get a matched combination from NRHS! Listed below are some of our most popular packages, proven on the dyno and on the street. Or give NRHS a call and let us put together something made just for you that we know works.

 

Description

Black with  Highlighted Fins

04 and up 1200r heads

Silver

XB heads

Stock XB heads engine kit, 1212cc

Bore & hone your cylinders to 3.515”

10.5:1 pistons, pins, clips, rings

New  04 and up 1200 heads*

Complete Top End Gasket Set

005-NR3515TSS1EKH

$1375.00

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-NA3563TSS2EKH-H

$2425.00

005-NA3563TSS2EKH

$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-NA3563TSS3EKH-H

$2525.00

005-NA3563TSS3EKH

$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-NA3563TSS3EKH-SH

$2775.00

005-NA3563TSS3EKH-S

$2900.00