4 Harley-Davidson Sportster Big Bore 1250 & 1275 Kit Manufacturers

Sportster big bore kits offer major performance increases for both the Sportster 883 and Sportster1200, but who makes these kits and where do you start? Were going to answer those questions in this video by taking a look at 4 different companies producing Sportster Big bore kits. NRHS, S&S Cycle, Revolution Performance and Hammer Performance offer a wide price range and options vary between each company. We'll look at the pricing and the differences in the products between each company to help you decide which one fits your needs and budget.

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Bikes on the channel:

Motorcycle: 2016 Harley-Davidson Sportster XL1200CP (Sportster 1200 Custom)

Custom Parts Installed:
Screamin' Eagle Heavy Breather air cleaner
Harley-Davidson Reach Seat
Harley-Davidson Chrome and Rubber Collection grips
Drag Specialties Offset Clevis Footpeg Conversion Kit
Aftermarket Detachable Back Rest
Harley-Davidson Air Flow timing cover
Harley-Davidson Air Flow clutch cover
Screamin' Eagle spark plug wires
Screamin' Eagle spark plugs
Flipped Down Stock Mirrors

Motorcycle: 2017 Harley-Davidson Sportster XL1200X (Sportster Forty-Eight)

Custom Parts installed:
Harley-Davidson Factory Security System
Screamin' Eagle Exteme Billed Air Cleaner (Black)
Harley-Davidson Burst Collection Foot Pegs
Harley-Davidson Burst Collection Grips
Harley-Davidson Burst Collection Shifter Peg
Screamin' Eagle spark plug wires

[GixxerFoo]

Let me know if you are aware of any other companies producing Sportster big bore kits!! Thank you for watching and supporting!

[Doomzday]

Every time I think about getting rid of my sportster I can’t do it’s such a great machine!

[georgecostanza]

S&S makes great exhausts, crate engines and other components, but Hammer's 1275 kit takes the win for Sportster upgrades. Honestly, Hammer leads this market and everyone else is just fighting for scraps. They offer very high quality products, lots of options, real world cutting edge r and d, knowledgeable staff providing friendly service, and fair prices. They are so far beyond the competition there's absolutely no reason to consider anyone or anything else, the best choice is crystal clear as far as big bore kits for a Sportster is concerned: Hammer Performance.
I don't work for them and they haven't paid me to promote them, but trust me... if you work with Hammer to modify your bike, you'll be singing the same tune.

[paulfiore]

Since my best friend passed last year you have become my spiritual mechanical guru. We talked engine, all types but especially Harley and air cooled since they're basically the same 😊. I was looking for performance mods for my 96 Sportster S and here you are! Thanks!

[bobkinney]

Thanks for the review on these and showing the Hammer Time! 1275!

[t.s.racing]

As a true Harley Engine Builder, I can honestly say this, that S&S has always rated their performance numbers modestly. Even on the 143 Twin Cam, the real world numbers are much higher than published.
The quality is second to none, I can say this honestly as well. No, I don't receive any special treatment from the company, but I truly stand by them. SARGE.

[edwinnaranjo]

I did Hammer 1250 and will never be more happy with the decision. Even though i have never work with the other companies, the costumer service is amazing with hammer, even in weekends or in the night. If they see your question they will answer via email.
One important thing, it depends on the year of your sporty but in most cases you HAVE to buy an ignition module. And it adds at least 300$ more to the numbers for a "basic" conversion.

[Wisk]

Have a 1275 hammer kit ported 883 heads dynatech 2000i ignition mikuni hsr 42 extra clutch plate kit and I wouldn’t ever get anything else ! HAMMER 🔨 IS THE WAY TO GO ! 🔥🔥🤘🤘👍👍

[chrisjohns]

Great news everyone! Hammer has just re-released their 90 inch kit!

[dennishowell]

I went with the hammer performance 100 horsepower 1250 kit Sledge ported heads their Billet aluminum intake Mikuni 45 carburetor in my 4 speed Sportster very pleased with the performance

[tjsellers]

I had a 09 nightster 1200 SEST SE heavy breather and V&H short shots dyno tuned by Milt @ what was Dales Mt Vernon Illinois now called Roadhouse HD the bike made 80hp and 80 ft lbs. No internal mods. All stock. Amazing what a good dyno guy can squeeze out of one.

[shawn]

Hammer 1275 with 30* reverse dome pistons and definitely do the heads and cams, without question . Got mine for 1300$ on black Friday sale included gasket s cometic with rings gaped and bronze oil pump gear correct jets for my old Evo started on first revolution

[BigBikeEnergy]

I've learned so much watching your videos. I hope you keep making them.

[jamesderbaum]

I went with the 1275 kit, with XB heads ported with 190 intake valves, with the 560 cams, S&S Super-G with a thunder jet with a supertrapp 2 into 1 exhaust that I had to remove the baffles out of it because it wouldn't run with it. Fabricated some baffles for the exhaust. Total Beast. One thing you should know though running a S&S carburetor on the 1275 kit you have to cut off three fins on the intake side of the cylinder so you can bolt up to a S&S intake to the heads. They failed to tell you. They claimed they manufacture this with the intention of Mikuni the Mikuni will bolt right up. But I'm running a Super G with a 93 main jet and a 110 thunderjet. Dyna s ignition. Super fast very easy starting also. I recommend going with the carbon fiber clutches with the energy one 15% clutch spring

[HolyBibleOpen]

Hammer has reached 132 hp on their 1275 kit. HPI throttle body and ported heads. Tuner and pipes. Trask makes a turbo kit as well. Combine them and who knows how much hp you will get. May build one to find out.

[scottzweiback]

The hooligan kit comes with the large finned cylinders, I have a 94 xl and bought the the kit for 99-up it bolts right on but you need to buy different lifters, s&s doesn't make them for the older bikes I went with Comp cams lifters, I love it...
Highly recommend changing compensator gear and clutch

[ardzye]

Love my S&S kit on my 05. Best decision.

[robertlumsden]

i went with the harley kit and i liked it. it is plenty for me. i went from the 883 to 1200 and it was just super great. such a great increase in power. i have heard great things about hammer.

[thomasbarnardjr]

Great video...I love the content. I looked into the big bore kit for my sportster bobber build, but ended building my own engine out of a few different engines. My engine is a 1988 883cc low end, with a buell xb conversion. The pistons and heads are out of a xb9 engine and are roller rocked, with polished valves and bee hive springs. This particular conversion yields a 12:1 engine compression that's insane. The engine has the Andrew's v4 grind cams that are .0500 lift. It also has the Andrew's 4140 chromoly adjustable pushrods. The roller rockers are made from Jims. The lifters are the original hydraulic lifters for now. The engine has an accel 35496 ignition set up on single fire, and stealth super coils that I'm hoping to use. The bike is running a S&S super E shorty carb with a Kuryaken velociraptor breather as well. I'm looking at getting between 90-100 horsepower at the end of the day. At least that's what I'm hoping for. Like I said before, great content. Thanks again

[nbowlingtrio]

I've done two hammer kits and they really wake the small evo up. I was pleasantly surprised