S&S 883 To 1200 Conversion Kit For Harley Sportster 1986-2017
  • S&S 883 To 1200 Conversion Kit For Harley Sportster 1986-2017 - Silver
  • S&S 883 To 1200 Conversion Kit For Harley Sportster 1986-2017 - Silver

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Video Reviews (2)

S&S 883 To 1200 Conversion Kit For Harley Sportster 1986-2017 Videos

S&S Cycle 883cc To 1200cc Conversion Kit For Harley Sportster

Maybe you need more power from your 883. Maybe you're a handy type who realized he could buy an 883 and a big-bore kit cheaper than he could buy a 1200 Sportster. Whatever the reason you're contemplating enlarging your engine, know that S&S has got you covered with a high-quality kit that makes the job a snap.


  • Increases displacement from 883cc to 1200cc
  • Save time because pistons are already fit to the cylinders - they're ready to assemble right out of the box
  • No machining
  • No re-balancing of your 883cc flywheels
  • No cylinder head modifications
  • Available in wrinkle black and silver powdercoat finish
  • Big bore 3 1/2" cylinders
  • 9.6:1 compression ratio with stock 883cc heads
  • Kits include cylinders, pistons, rings and gaskets (head, base and exhaust)
  • Made in the USA
5 / 5
Bang For The Buck
4 / 5

Fitment Notes & Exceptions

  • You will need to purchase rocker box cover, carburetor, and intake gaskets for most bikes in addition to the kit contents
  • These parts require a good deal of technical skill to install correctly - it is the responsibility of the person assembling the parts to check all clearances and assembly specifications
This Product Fits:
Harley Davidson
Sportster Custom XL883C 19982009
Sportster Deluxe XLH883DLX 1989, 1990, 1991, 1992
Sportster Hugger XLH883HUG 19882003
Sportster Iron XL883N 20092017
Sportster Low/SuperLow XL883L 20052017
Sportster Roadster XL883R 20022012
Sportster XL883 20042009
Sportster XLH883 19862003
Product Style RevZilla Item # Manufacturer Product # Availability
Black 958416 910-0296 In Stock: Ships within 24 hours
Silver 958415 910-0301 In Stock: Ships within 24 hours


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5.0 / 5.0
1 Review
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Bang For The Buck
4.0 / 5
Bang For The Buck
4 / 5
More oomph
I thought an 883 would be enough for me...I was wrong. Instead of buying a new bike I got this kit and had it professionally installed. It's overall quicker (obviously) and it made my exhaust (V&H grenades) sound a little deeper. I've had them on for about a week now and so far so good. I also sought to get the FuelPak3 to regulate.
My garage said they could've gotten the parts for me for a little cheaper so shop around.
April 3, 2016
2014 Harley Davidson Sportster Iron XL883N
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Have a functionality, fit, or otherwise product-specific question about the S&S 883 To 1200 Conversion Kit For Harley Sportster 1986-2017? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

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Browse 9 questions Browse 9 questions and 6 answers
How many horse power is added after the conversion?
Do?a K on Aug 14, 2016
What is the correct Cylinder Head to get in conjunction with the Big Bore kit for a 2013 Iron 883?
Jesse L on Mar 15, 2016
The notes at the bottom of the big bore kit upgrade state that you will need to buy rocker box cover, carb, and intake gaskets. THe Gaskets are listed with the kit description, are those the correct gaskets mentioned? What Carb part would I need? I've picked out the rockerbox cover, but the way the kit reads, are those absolutly needed?
I also have a question about the Roland sands Venturi Ronin air cleaner. What adjustments will I need to make if I install that?
I have never done any upgrades to a bike, but I have worked on a bike in the past, I will have knowledgeable help when doing this, I just need to know what all to buy.
Thanks in advance.

A shopper on Mar 21, 2015
BEST ANSWER: Roger V: The gaskets that come with the kit are base and head gaskets. Since you are removing the heads you need to remove the valve covers (rocker box) and the intake manifold and exhaust pipes therefore you will most likely need to replace all these gaskets. since you are not changing the heads you can reuse the valve covers. The carburetor will need to be rejetted or replaced since the displacement is increased and therefore the airflow. If a fuel injected biked model the ECU will need reprogramming and perhaps new higher flow injectors will be required.
I have the 2016 iron , i would like to know if I need to buy an aftermarket coil and bigger plug wires for this kit to run properly?? Any help is greatly appreciated .
A shopper on Oct 4, 2015
BEST ANSWER: Roger V: Ignition voltage and energy requirements are largely dictated by the density of gas in the spark plug gap and the gap distance itself. Since the compression ratio is not changing significantly and I assume you will keep the same spark plug gap no ignition system changes should be required.
i have a 97' 883. do they state what kind of jetting is needed or change stothe carb?
ErnieC on Feb 9, 2016
BEST ANSWER: There is no preset jetting you can install, every engine is different and it's trial and error. You are safest bringing bike to a dyno and letting them rejet so your air / fuel ratios are correct and you do not run too lean and melt down your expensive engine.
Will I burn more oil with this kit? Or more gas ?
Tony R on Aug 29, 2016
A shopper on Jun 18, 2016
BEST ANSWER: You run a Harley with a belt drive, it's not like the old chain drives where you would drop a tooth in one or the other sprockets. With all the Extra Horsepower that comes with this kit you will get if you properly re jet your Carb or put a tuner on your fuel injection, install a high flow airfilter, replace the restrictive exhaust and hold on it will have plenty of power throughout all speeds. It is a fantastic kit, turns your peppy bike into a beast.. highly recommend
Will my aftermarket exhaust still work with this big bore kit?
A C on Oct 9, 2016
Are these small fin cylinders like 2003 and earlier or big fin like 2004 and later ?
A shopper on Oct 2, 2016