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Most people shopping “carb for 1200 Sportster” assume bigger is better — swap the stock 40mm CV for a 42mm or 45mm unit and expect more power everywhere. On a Sportster 1200 that still has its factory camshaft, heads and exhaust, that assumption is backwards. The stock Keihin CV40 already flows more air than a mild, stock-cam 1200 can use below roughly 4,000–4,500 rpm; going bigger without changing anything else typically makes part-throttle response softer and the idle lumpier, not the bike faster. The venturi size that helps is the one matched to the cam and heads you actually have, which is why the flatslide and big-bore carbs below are worth it mainly on a bike that’s already had cam, head or exhaust work — not as a first mod.
The second thing that trips people up: a “carburetor” swap on a Sportster is really a kit swap. Moving off the stock CV40 to an S&S or Mikuni changes the intake manifold, the air cleaner mount, and — critically — the throttle cable setup. S&S’s Super E and Super G use a two-cable pull-open/pull-close throttle arrangement, different from how the stock Harley cable pulls; Mikuni’s Easy Kits are built specifically to reuse the stock manifold, choke cable and air cleaner so you’re not also sourcing a new cable and backing plate. Read what’s actually included before assuming “carburetor” means only the carburetor body.
If the stock CV40 hesitates off idle, floods, or leaks fuel, that’s usually a worn accelerator-pump diaphragm, float needle or gasket set — not a reason to buy a whole new carburetor. A rebuild kit runs a fraction of the price of a replacement and restores exactly the factory part-throttle calibration a stock-cam 1200 is tuned around.
One more thing worth knowing before you search “EFI to carb Sportster”: on a fuel-injected 2007-and-later model, that phrase runs the opposite direction most people expect — it’s owners removing EFI and its ECU in favor of a simpler, standalone-ignition carbureted setup, not carbureted bikes gaining EFI. It’s a bigger, pricier job than any carb swap below, since it also replaces the ignition module and wiring, not just the intake.
None of the picks below have been installed or ridden here — this is a buying guide, not a test bench. Check your Sportster’s model year against each kit’s listed fitment before you buy; Sportster carb compatibility splits at several points across 1988–2006.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Mikuni HSR42-10 Easy Carburetor Kit | $460–$530 | Amazon · eBay |
| 2 | Mikuni HSR42-11 Easy Carburetor Kit | $395–$460 | Amazon |
| 3 | S&S Super E Carburetor Kit | $685–$900 | Amazon · eBay |
| 4 | S&S Super G Carburetor Kit | $730–$900 | Amazon · eBay |
| 5 | Dlkvoro CV40 Complete Replacement Carburetor | $70–$90 | Amazon · eBay |
| 6 | SVKCAR CV40 Carburetor (with Throttle Cable) | $75–$95 | Amazon · eBay |
| 7 | Drag Specialties CV Carburetor Rebuild Kit | $25–$35 | Amazon · eBay |
| 8 | CV Performance CV Carburetor Tuner Kit | $60–$90 | Amazon |
| 9 | Billet Proof Design 7-Piece Keihin CV Carburetor EZ Quick Tuner Kit | $55–$70 | Amazon |
| 10 | REM Motorcycle Sportster Carburetor Conversion Kit (883/1200/X48/V72) | $1,600–$1,850 | Amazon · eBay |
The picks, in detail
Mikuni HSR42-10 Easy Carburetor Kit
Mikuni’s HSR42 Easy Kit is the most common flatslide upgrade for a 1994-2004 Sportster 1200, and the “easy” in the name is specific: it’s built to bolt to the stock intake manifold, choke cable and air cleaner instead of forcing a full induction-system swap. The 42mm flatslide bore rides on a roller-bearing slide for a crisper throttle pull than the stock CV design, and it ships pre-jetted for the 1200 rather than needing a full tuning session before the first ride.
- 42mm flatslide bore on a roller-bearing slide
- Reuses the stock intake manifold, choke cable and air cleaner
- Pre-jetted for the 1994-2004 Sportster 1200
- Adjustable accelerator pump
- Crisper, more direct throttle response than the stock CV design
- Contained swap since manifold, cable and air cleaner all carry over
- Pre-jetted starting point for this specific engine
- Little benefit on a bike that hasn’t also had cam, head or exhaust work
- Costs several times more than a rebuild kit for the stock carb
- Still needs fine tuning of the jetting for your specific exhaust and air cleaner
Mikuni HSR42-11 Easy Carburetor Kit
The 42-11 is Mikuni’s other Easy Kit part number for this engine, covering 1994-2006 Sportster and Buell models rather than the 42-10’s narrower 1994-2004 range — worth checking against your exact year before choosing between the two, since they’re the same flatslide carburetor with different stated fitment. Same roller-bearing slide, same reuse of the stock manifold and cables, same pre-jetted starting point as the 42-10.
- 42mm flatslide bore, same body as the HSR42-10
- Stated fitment through 2006, including Buell models
- Reuses stock manifold, choke cable and air cleaner
- Pre-jetted from the factory
- Covers later Sportster and Buell model years the 42-10 doesn’t list
- Same proven flatslide performance as the 42-10
- Backed by Mikuni’s established parts and jetting support
- Functionally overlaps the 42-10 — easy to order the wrong one for your year
- Same lack of benefit on an otherwise-stock engine as the 42-10
- Pricing and availability vary more by retailer than the 42-10
S&S Super E Carburetor Kit
S&S’s Super E is the best-known aftermarket carburetor in the Harley world, with a 1-7/8″ throttle bore and 1-9/16″ venturi sized for engines up to 100 cubic inches — a stock-displacement 1200 with cam and head work fits comfortably inside that range. It creates higher air velocity than the stock CV design, which sharpens low- and mid-range throttle response, and the kit includes S&S’s own teardrop air cleaner, manifold and jetting.
- 1-7/8″ throttle bore, 1-9/16″ venturi
- Rated for engines up to 100 cubic inches
- Kit includes teardrop air cleaner, manifold, mounting hardware and jets
- Requires a two-cable pull-open/pull-close throttle setup
- Higher air velocity than a CV design sharpens throttle response
- Complete kit — air cleaner, manifold and jetting included
- The most widely used aftermarket Harley carb, so tuning help is easy to find
- Expensive relative to a rebuild kit or a direct CV40 replacement
- Needs the two-cable throttle conversion, not a straight swap onto stock cables
- Not a dramatic gain over a well-tuned stock CV40 on a genuinely mild engine
S&S Super G Carburetor Kit
The Super G is S&S’s larger sibling to the Super E — a 2-1/16″ throttle bore and 1-3/4″ venturi that S&S itself specifies for engines of 90 cubic inches and up. On a stock-displacement 1200 that hasn’t been bored or stroked, that’s more carburetor than the engine can use; it belongs on this list for readers running a big-inch build, not as a default upgrade over the Super E.
- 2-1/16″ throttle bore, 1-3/4″ venturi
- S&S-specified for engines of 90 cubic inches and up
- Kit includes teardrop air cleaner, manifold and jetting
- Requires the same two-cable throttle setup as the Super E
- Correct choice if the engine is actually bored or stroked past 90 ci
- Same complete-kit contents as the Super E
- Large bore leaves headroom for further engine work
- Oversized for a stock-displacement 1200 — S&S’s own spec says so
- Same cost and cable-conversion requirement as the Super E
- Wrong pick for this exact bike unless the bottom end has already been built
Dlkvoro CV40 Complete Replacement Carburetor
A direct-fit 40mm CV carburetor built to replace the OEM Keihin unit by part number — it references 27421-99C, 27490-04 and 27465-04, the same numbers stamped on the factory carb, and mounts to the stock manifold without other kit changes. It’s the least expensive way to put a complete new carburetor on the bike rather than rebuilding the old one, and it ships pre-jetted for street use.
- 40mm CV design, direct replacement for 27421-99C / 27490-04 / 27465-04
- Bolts to the stock intake manifold
- Pre-jetted for street riding
- Includes accelerator pump
- Lowest-cost way to a complete new carburetor
- Drops onto the stock manifold without other kit changes
- Comes pre-jetted rather than needing a jet kit before first ride
- Generic overseas manufacturer with no long-term reputation for QC or longevity
- Often needs rejetting to run cleanly with a non-stock exhaust or air cleaner
- Accelerator-pump diaphragms on carbs like this have a reputation for wearing faster than OEM Keihin
SVKCAR CV40 Carburetor (with Throttle Cable)
Another direct-fit 40mm CV replacement referencing the same 27421-99A OEM part number, sold with a 35.4-inch throttle cable included — useful if a frayed or wrong-length cable is part of why the bike’s been running poorly. Fits the same broad range of CV-carbureted Sportster, Softail, Dyna and Touring models as the other budget replacements on this list.
- 40mm CV design, replaces OEM 27421-99A
- Includes a 35.4″ throttle cable
- Fits CV-carbureted Sportster, Softail, Dyna and Touring models
- Accelerator pump included
- Same low cost and direct fitment as other budget CV40 replacements
- Bundled throttle cable useful if the stock one is also worn
- Broad model coverage beyond just the Sportster
- Same generic-manufacturer caveats on QC and longevity as any budget import carb
- Bundled cable is a fixed 35.4″ length — measure before assuming it fits your bars
- Still needs the same rejetting check as any budget replacement
Drag Specialties CV Carburetor Rebuild Kit
Drag Specialties is a mainstream Harley aftermarket parts brand, not an unknown import, and this kit rebuilds the factory Keihin CV carb on any 1988-2006 model rather than replacing it — new gaskets, diaphragm, float needle and jets for a fraction of a new carburetor’s price. The right call when the bike’s actual problem is a 20-year-old diaphragm, not the carburetor’s design.
- Fits all 1988-2006 Keihin CV carburetors
- Includes gaskets, accelerator-pump diaphragm, float needle and jets
- Part number 1003-0292
- From an established Harley aftermarket brand
- Restores factory-tuned part-throttle behavior at a fraction of a new carb’s price
- From an established brand rather than an unlabeled import kit
- Fixes the actual wear items behind most rough-running complaints
- Doesn’t fix a warped, cracked or corroded carb body — only wear parts
- You do the labor of stripping and rebuilding the carb yourself
- Some buyers report gasket and O-ring sizing needs light trimming to seat right
CV Performance CV Carburetor Tuner Kit
CV Performance builds jetting kits specific to Sportster 1200 model-year ranges rather than one-size-fits-all jets, with variants for 1988-2003 and 2004-2006 XL1200s. The kit swaps the needle, main and idle jets and includes stainless float bowl hardware — the fix for a stock CV40 that runs lean or rich off idle without replacing the carburetor it’s already bolted to.
- Model-year-specific jetting for 1988-2003 and 2004-2006 XL1200
- Custom needle, main and idle jets
- Stainless float bowl hardware included
- Tuning instructions included
- Fixes the actual jetting problem behind most rough-running stock CV40s
- No need to buy a new carburetor to correct lean or rich part-throttle running
- Instructions and hardware included, not just loose jets
- Doesn’t fix a worn diaphragm, float needle or vacuum piston — jetting only
- Wrong kit if you order the wrong year variant for your XL1200
- Still requires carb removal and careful reassembly to install
Billet Proof Design 7-Piece Keihin CV Carburetor EZ Quick Tuner Kit
A seven-piece jet kit for the Keihin CV40 on 1988-2003 Sportster 1200 XL models: four main jets (165/170/175/180), two pilot jets (45/48) and a needle, letting you step jetting up or down without ordering parts one at a time. It’s the cheapest way on this list to correct factory jetting that’s wrong for your exhaust or air cleaner — it doesn’t touch the carb’s wear parts.
- Includes main jets 165, 170, 175 and 180
- Includes pilot (slow) jets 45 and 48
- Includes one needle
- Specific to 1988-2003 Sportster 1200 XL models
- Cheapest way on this list to correct lean or rich jetting
- A spread of main jet sizes included, so you’re not guessing at one size
- Sized specifically for the 1200 XL’s known jetting range
- Jets and needle only — no diaphragm, spring or float parts
- Limited to 1988-2003 fitment, no help for later EFI-era bikes
- Still requires removing the carb from the bike to change jets
REM Motorcycle Sportster Carburetor Conversion Kit (883/1200/X48/V72)
The only entry on this list for a fuel-injected 2007-and-later Sportster: a complete kit that replaces the factory EFI with an assembled carburetor body, a new intake adapter, and a standalone ignition module that bypasses the stock ECU, plus manual choke and throttle linkage parts. It’s a full induction-and-ignition swap, not a carburetor purchase, priced by a European retailer in euros — expect it to land well above anything else here.
- Assembled carburetor body plus intake adapter
- Standalone ignition module bypasses the factory ECU
- Manual choke and throttle linkage parts included
- Covers Sportster 883, 1200, X48 and V72
- Only complete option here for a 2007+ EFI Sportster going back to a carburetor
- Includes the ignition side of the swap, not just the carb
- One kit rather than sourcing carb, manifold and ignition parts separately
- Roughly three times the cost of any other carburetor on this list
- Removes factory emissions control and ECU tuning — check local street-legality before buying
- Priced and shipped from Europe in euros, adding import cost and lead time
Buying tips
- Measure your Sportster’s model year against each carb kit’s listed fitment before buying — Sportster carb and manifold fitment changes at several points between 1988 and 2006.
- If your bike runs a stock cam, exhaust and heads, try a rebuild kit or jet kit on the stock CV40 before spending on a bigger aftermarket carb.
- Budget for a new intake manifold, air cleaner backing plate and throttle cable when pricing an S&S Super E or Super G — the carb body alone is not the full cost of the swap.
- Re-jet any new carburetor after installation rather than assuming the factory jetting suits your specific exhaust, air cleaner and altitude.
- Confirm your throttle setup is a two-cable pull-open/pull-close arrangement before ordering an S&S carb, since the stock Harley cable pulls differently.
- Inspect the accelerator-pump diaphragm and float needle first if the bike hesitates or floods — both are wear items a rebuild kit replaces cheaply.
- Check which XL1200 year range your tuner kit or jet kit is designed for; CV40 jetting specs changed between the 1988-2003 and 2004-2006 Sportster.
- Treat an EFI-to-carb conversion as a full ignition-and-fueling swap, not a carburetor purchase, and price the ignition module and wiring alongside the carb kit itself.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.