HAMMER PERFORMANCE - High Performance for your Harley Twin Cam, Evo Big Twin, Sportster or Buell! These kits work with your stock 883 heads! This kit lets you take your 883 Sportster out to 1250cc with no case boring required and no change to your cylinder heads 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. Silver Sledge Hammer 3-9/16 Bore Iron Lined Aluminum Cylinders. In the 2004+ big fin style - The ONLY 1250 kit available in the proper fin style for 2004+ models! Sledge Hammer 3-9/16 Bore Forged Pistons. In a dished design to allow the use of your stock 883 heads and give a 10:1 compression ratio.
Lightweight Tool Steel Wrist Pins. Premium Quality Moly Faced Rings. 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!
Also check out our new bolt-on 1275 kits! DON'T COMPROMISE YOUR BIKE'S APPEARANCE OR COOLING! There's a MASSIVE difference Between Small and Big Fin Cylinders! Use the Correct Style on Your 2004+ Sportster!New bigger fins (right) were part of a coordinated series of changes that came out in 2004 to manage the additional heat that came with higher cylinder pressures introduced that year. All 2004 Sportsters got oil squirters under the pistons to cool the undersides of the domes, MAP based ignition, and these bigger fins on both the heads and cylinders.
Although small fin cylinders can be made to fit on 2004+ bikes by grinding on the lowest fin on the pushrod side, that's a hack! They won't match your heads and you'll go backwards in your cooling capacity. Don't compromise your bike's appearance or cooling capacity with an inferior 1250 kit.HAMMER PERFORMANCE offers the ONLY big fin 1250 kit on the market today! OPTIONS TO MAKE THESE KITS EVEN BETTER. For the ultimate in convenience, add our pre-assembly option. 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. Another popular option is to upgrade the included head and base gaskets to a Cometic full top end gasket set. Gap Rings and Pre-Assemble Engine Kit. Upgrade Head & Base Gasket to Full Cometic Top End Gasket Set. The Cometic Extreme Sealing Technology (EST) top end gasket set is a premium gasket set with every gasket you'll encounter during the 1250 kit installation. QUESTIONS ABOUT CONVERTING YOUR 883? HAMMER PERFORMANCE has put together a tech article to tell you all about converting your 883 to a 1250 or 1275. 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.. 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! Can this kit be installed on an 883 with stock heads and no machine work or balancing? This kit comes with pistons made for use with stock 883 heads. They give a 10:1 compression ratio.
Is anything else needed to install this kit? Yes, you will probably need some other things depending on the year and model of your Sportster.
The correct jets are available from HAMMER PERFORMANCE. 2004+ 883 models need a clutch spring upgrade. Read more about this here.2007+ models will need a suitable flash tuner device to adjust both fueling and ignition timing. Read about suitable tuner devices here. For information on a complete package with everything you need for a successful conversion. Please Read BEFORE You Order! We need some specific information before we can fill your order.
You can help us out and eliminate a lot of back and forth if you provide this info at the time you place the order. What year is your 883 Sportster? This has all of the gaskets and seals you need for the entire top end, including rocker box, head, base, intake, exhaust, and pushrod covers. We precision gap your rings and assemble the pistons and rings into the cylinders for you. They will arrive pre-lubed and ready to install per our kit installation instructions.
This service eliminates the most tedious and error prone part of the kit installation. Over 95% of our customers choose this option, and of the few who don't, probably half of them end up ordering a replacement set of rings because they botched the job. You can do it successfully, though, if you're careful and patient. Our kit installation instructions go over the procedures. The invoice will cover the cost of the upgrades.
Please help us help you and provide the information at the time of your order. The item "HAMMER Bolt-On 883 to 1250 Conversion Kit for 2004-Present Harley Sportster" is in sale since Friday, April 14, 2017. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits". The seller is "hammerperf" and is located in Sandpoint, Idaho. This item can be shipped worldwide.