1986-2003 SPORTSTER Engine Kits


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

 

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

From $780.00

 

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 iron lined aluminum, Axtell nicom plated 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 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

$780.00

004-NAIL3563XLK-S

$780.00

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

$780.00

004-NAIL3563XLSK-S

$780.00

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

$780.00

004-NAIL3563TSK-S

$780.00

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

$780.00

004-NAIL3563XB12SK-S

$780.00

 

 

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

$770.00

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

$770.00

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

$770.00

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

$770.00

 

 

1250 Kits With Axtell Nicom Plated Aluminum Cylinders

(top photo)

All-Aluminum construction offers the lightest weight and best heat dissipation. 

Description

Highlighted Fins

Standard Fins

1250cc Bolt-on kit for XL1200 Heads

Natural Aluminum

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

also for 1995-1996 Buell S2/S2T models

004-NA3563XLK-H

$1270.00

004-NA3563XLK

$1220.00

1250cc Bolt-on kit for XL1200 Heads

Silver Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

also for 1995-1996 Buell S2/S2T models

004-NA3563XLK-SH

$1320.00

004-NA3563XLK-S

$12700.00

1250cc Bolt-on kit for XL1200 Heads

Black Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

also for 1995-1996 Buell S2/S2T models

004-NA3563XLK-BH

$1320.00

004-NA3563XLK-B

$1270.00

1250cc Bolt-on kit for XL1200S Heads

Natural Aluminum

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563XLSK-H

$1270.00

004-NA3563XLSK

$1220.00

1250cc Bolt-on kit for XL1200S Heads

Silver Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563XLSK-SH

$1320.00

 

004-NA3563XLSK-S

$1270.00

1250cc Bolt-on kit for XL1200S Heads

Black Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563XLSK-BH

$1320.00

004-NA3563XLSK-B

$1270.00

1250cc Bolt-on kit for Thunderstorm Heads

Natural Aluminum

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563TSK-H

$1270.00

004-NA3563TSK

$1220.00

1250cc Bolt-on Kit for Thunderstorm Heads

Silver Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563TSK-SH

$1320.00

004-NA3563TSK-S

$1270.00

1250cc Bolt-on Kit for Thunderstorm Heads

Black Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563TSK-BH

$1320.00

004-NA3563TSK-B

$1270.00

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

Natural Aluminum

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563XB12SK-H

$1270.00

004-NA3563XB12SK

$1220.00

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

Silver Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563XB12SK-SH

$1320.00

004-NA3563XB12SK-S

$1270.00

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

Black Painted

3-9/16 bore Axtell aluminum cylinders

10.5:1 dome pistons, pins, clips, rings

head & base gaskets

004-NA3563XB12SK-BH

$1320.00

004-NA3563XB12SK-B

$1270.00

 

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 Nicom 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" and now 90" KIT FOR EVOLUTION SPORTSTERS!

From $820.00
 

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 all-aluminum, Axtell aluminum cylinders with cast iron sleeves, or Axtell  cast iron cylinders,  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

 

90ci Kits With Axtell Cast Iron Cylinders

Cast iron construction offers the ultimate in structural integrity and ring seal. This is especially important in the 90ci application as the cylinder wall becomes thin. Our testing has shown that aluminum is not strong enough to maintain good ring seal in this application, but cast iron works very well. Cylinders come only in black baked finish. Fin highlighting is not available. Powder coating is available for an additional $100.00

Description

Black

90ci Big Bore Kit

3-7/8 bore Axtell cast iron cylinders

10.8:1 flat top pistons, pins, clips, rings

head and base gaskets

(case boring required)

10.8:1 CR based on stock 67cc chamber. NRHS can modify your heads for higher or lower CR. Call for details

004-NACI3875FT-B

$820.00

 

 

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

Highlighted Fins

Standard Fins

88ci Big Bore Kit for Thunderstorm Heads

Natural Aluminum

3-13/16 bore Axtell iron lined aluminum cylinders

head and base gaskets

(case boring required)

004-NR3813CITSK-H

$1170.00

004-NR3813CITSK

$1120.00

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

$1270.00

004-NR3813CITSK-S

$1220.00

88ci Big Bore Kit for Thunderstorm 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-NR3813CITSK-BH

$1270.00

004-NR3813CITSKCI-B

$1220.00

88ci Big Bore Kit for XB/2004 XL1200 Heads

Natural Aluminum

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-H

$1170.00

004-NR3813CIXB12S

$1120.00

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

$1270.00

004-NR3813CIXB12S-S

$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

$1270.00

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