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Bolt-on 1250 Kit For 86-up Xl Sportster Or Buell For Sale

Bolt-on 1250 Kit For 86-up Xl Sportster Or Buell

HAMMER PERFORMANCE - High Performance for your Harley Twin Cam, Evo Big Twin, Sportster or Buell! 970-344-7120 BOLT-ON 1250 Kits from HAMMER PERFORMANCE For 1986-present Sportsters and 2004-2010 Buell XB12 Now Available in 2004-Up Big Fin Style!


2004-Up Big Fin Style Hammer Performance Bolt-On 1250 Kit in Black Highlighted
Also available in straight Black or Silver
Also available with smaller 86-03 style fins


Our 1250 Kits let you take your Sportster or Buell XB12 out to 1250cc with no case boring required. It's a bolt-on kit that can be installed in an afternoon without removing your engine from the frame!


Each kit comes standard with the best components on the market:

  • Sledge Hammer 3-9/16 Bore Iron Lined Aluminum Cylinders in your choice of 86-03 or 04-Present fin style and Black, Silver, or Black with Highlighted Fins
  • Sledge Hammer 3-9/16 Bore Forged Pistons in your choice of dome configurations to match your heads
  • Lightweight Tool Steel Wrist Pins
  • Circlips
  • Premium Quality Moly Faced Rings,
  • Premium Quality .030 Multilayer Steel Head Gaskets and .020 Coated Steel Base Gaskets (upgrade to a full Cometic top end set available)
Installation is easy with our detailed illustrated instructions!
SLEDGE HAMMER CYLINDERS

Sledge Hammer cylinders from Hammer Performance are the result of over a decade of experience with 1250 kits. We've seen what works and what doesn't, and none of the offerings on the market really solved all the issues we came across, so we set out to make a cylinder that combines the best features of all of them. We're proud to bring you these fine cylinders, which we believe to be the best ones available for a street 1250 application. And we now have them available in either the 86-03 small fin or 2004-present big fin styles!


Ring seal depends on a straight and round bore, and this is the main objective in any cylinder design. Under the extreme pressure and heat of a high performance engine, cylinders want to grow, twist and distort, and that makes it impossible for the rings to stay sealed. We've seen some cylinders that grow and distort so badly that head bolts break, cylinder studs pull out of the cases, and head gaskets blow.

For the straightest and roundest bore possible under these extreme conditions, cast iron is the ticket, as it's much stronger and grows about half as much as aluminum. But aluminum offers advantages in the form of reduced weight, better heat dissipation, and it doesn't rust. So we made Sledge Hammer 1250 cylinders with the best of both worlds: an aluminum cylinder with an extra thick iron liner that stays straight and true. The end result for you is a lightweight, cool cylinder with superb ring seal for less oil consumption, less blow-by, and more power.

But we didn't stop there. Since the cylinder stays round and true, ring seal depends less on the ring's ability to carve the liner into it's shape. As a result, were were able to use a harder iron alloy for the liner than you find in most cylinders - we actually had to get new, harder honing stones to even hone these cylinders! Our measurements show a wear rate that's less than half the wear rate on the factory cylinders. You can expect a long, trouble-free life from Sledge Hammer cylinders.



Choose the cylinder color you want and indicate at checkout


SLEDGE HAMMER PISTONS

Complementing these great cylinders is a set of our exclusive forged Sledge Hammer Pistons. These pistons are lighter than the competition's for more power and less vibration, and they're actually stronger as well. They feature extra large valve pockets for those radical cams, anti-detonation grooves, dual wrist pin oilers, expansion grooves for superior ring seal, and ribbing to give maximum strength with minimum weight. You cannot find a finer piston for your HD or Buell


Unlike some of the other kits out there, we custom hone every set of cylinders to the exact set of pistons that are included in the kit. This gives a much more precise fit than you can get when slapping together off-the-shelf cylinders and pistons, resulting in better ring seal and longer life. Close is not good enough, we want it perfect!


So Just How Much Lighter is a Sledge Hammer Piston?


Here's a side by side comparison of a conventional forging 1250 kit 15 degree piston and the SLEDGE HAMMER 15 degree 1250 kit piston. Less weight means less vibration, less wear and tear on the lower end, and more power!. Use the best, SLEDGE HAMMER pistons from HAMMER PERFORMANCE!



Choose the dome configuration you need and indicate at checkout
Pistons are available to work with any 1986-present XL heads


NEW! Trick New 30 Degree Reverse Dome Piston Now Available!

Looking for the ultimate in chamber efficiency? Look no further! It's well known that 30 degree dome angles work the best; they give maximum chamber unshrouding and also direct the fuel coming out of the squish band more directly at the flame front. But the problem has always been that they give up squish band surface area unless the dome is made really tall, which of course cranks up the compression. For this reason, 30 degree pistons have largely been limited to race-only applications.

Until now, that is. We've combined a tall 30 degree dome, providing lots of squish area, with a dish in the middle to drop the dome volume down to pump-gas friendly levels. The result is what you see here, an ultra-trick 30 degree reverse dome piston suitable for street motors! No longer do you have to compromise on the dome angle to use pump gas!

These pistons are now available as a standard offering in the HAMMER PERFORMANCE Bolt-On 1250 kits. Order yours today!

Please Note: 30 degree pistons require a matching 30 degree squish band be machined in the chamber. HAMMER PERFORMANCE can handle this service for you. We machine all chambers by CNC and they come out a perfect match for the piston every time.



GET THE BEST! GET A 1250 KIT FROM HAMMER PERFORMANCE! Choose your kit below and indicate at checkout

Also let us know the year and model of your bike, and whether you want the 86-03 or 04-present fin style. The later big fin style works on any 86-up Sportster but the earlier small fin style requires a minor modification to fit on a late model Sportster; we will perform this mod for you if backdating your cylinders.


Hammer Performance 1250 Kits for Sportsters & Buells

Heads

Dome Type

Color

86-Present XL883

Reverse

10:1 @49cc

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

88-03 XL1200
95-96 Buell S2

Radius

10.5:1 @67cc

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

98-03 XL1200S
96-03 SE/Lightning
96-98 Buell S1
97 Buell S3
97-98 Buell M2
(Lightning Heads)

10 Degree

10.5:1 @62cc

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

98 Buell S1W & S3
99-02 Buell all

15 Degree

10.5:1 @67cc

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

86-87 XL1100
04-present XL1200
04-present SE
04-10 Buell XB12

10.5:1 @62cc

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

Custom Application

Flat Top

9:1 @67cc

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

Custom Application

Note 1

30 Degree Reverse Dome

10.5:1 @61cc
(SMASH ported 883 heads)

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

Custom Application

Note 1

30 Degree Reverse Dome

10.5:1 @72cc
(IMPACT ported 1200 heads)

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

Custom Application

Note 1

30 Degree Reverse Dome

10.5:1 @76cc
(CRUSH/SLEDGE ported 1200 heads)

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95

Race Application

Note 1

30 degree x .400

Machine for
Desired CR
Note 2

Silver - $699.95
Black - $699.95
Black w/Highlighted Fins - $699.95


Note 1: 30 degree dome angles provide the optimum chamber efficiency but require the cylinder heads be machined to match. HAMMER PERFORMANCE can handle this service for you.
Note 2: the 30 degree x .400 dome race pistons are designed to be cut down to achieve your desired compression ratio, call for details


OPTIONS TO MAKE THESE KITS EVEN BETTER

For the ultimate in convenience, add our pre-assembly option. For only $40 more, we'll thoroughly clean your cylinders, precisely gap your rings, and then pre-lube and assemble the pistons and rings into the cylinders. The ready-to-install assemblys will then be shipped to you in sealed plastic bags to keep them clean and safe. This service makes the installation a breeze, as you simply lower the piston down enough in the bore to expose the wrist pin hole, position it over the connecting rod, insert the wrist pin and circlip, and push the cylinder down into position. No special tools required!

Another popular option is to upgrade the included head and base gaskets to a Cometic full top end gasket set. We offer this upgrade option for a mere $40 more, and we have a wide selection of applications to choose from.


1250 Kit Options

Description

Price

Description

Gap Rings and Pre-Assemble Engine Kit

$40

We will precision gap your rings, assemble your pistons & rings into the cylinder, and ship the assemblies to you sealed in plastic bags fro protection.

Upgrade Head & Base Gasket to Full Cometic Top End Gasket Set

$40

1986-1990 .030 Head/.020 Base - C9907
1986-1990 .040 Head/.020 Base - C9762
1991-2003 .030 Head/.020 Base - C9854F
1991-2003 .040 Head/.020 Base - C9763
2004-2006 .030 Head/.020 Base - C9971
2004-2006 .040 Head/.020 Base - C9970
2007-Up .040 Head/.020 Base - C9177
04-10 Buell XB12 .040 Head/.020 Base - C9856

Tip: Choose your top end gasket set based on the type of rocker boxes you're using. The head and base gaskets all interchange from 1986-present.


CONVERTING AN 883?

HAMMER PERFORMANCE has put together a tech article to tell you all about converting your 883 to a 1250. Give it a read here. It lays out what you need for anywhere from a basic conversion ...


Actual Dyno Result from an otherwise stock 2004 883 converted to a 1250


... all the way up to a powerhouse of a conversion ...


Actual Dyno Result from a 2007 883 converted to a 1250 with head porting and cams


HAMMER PERFORMANCE has the technology, experience, and proven track record of making big results like this. Don't settle for second best, hit it with a HAMMER!
PICTURES OF KITS

Here you can see pictures of the cylinder styles and colors to choose from.



Hammer Performance 04-Present Big Fin Bolt-On 1250 Kit in Black



Hammer Performance 04-Present Big Fin Bolt-On 1250 Kit in Silver



Hammer Performance 86-03 Bolt-On 1250 Kit in Silver


Hammer Performance 86-03 Bolt-On 1250 Kit in Black



Hammer Performance 86-03 Bolt-On 1250 Kit in Black Highlighted


Bolt-on 1250 Kit For 86-up Xl Sportster Or Buell

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Bolt-on 1250 Kit For 86-up Xl Sportster Or Buell:
$700




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