







🏍️ Revive your Harley’s soul with precision power and unbeatable value!
The CV40 Carburetor Replacement is a direct-fit, 40mm constant velocity carburetor designed for Harley Davidson Sportster, Softail, Dyna, FXR, and Touring models from 1988 to 2017. It includes essential tuning components like multiple jets, fuel lines, spark plugs, and a fuel filter, enabling a comprehensive upgrade or replacement at a fraction of OEM cost. Highly rated by riders for reliable performance and easy installation, it delivers a smooth throttle response and restores your bike’s original power delivery.







| ASIN | B09QKY1QHJ |
| Best Sellers Rank | #24,766 in Automotive ( See Top 100 in Automotive ) #32 in Powersports Carburetors |
| Brand | Czsmbt |
| Brand Name | Czsmbt |
| Compatible with Vehicle Type | All Terrain Vehicle, Utility Terrain Vehicle, Quad, Motorcycle, Automobile |
| Customer Reviews | 4.4 out of 5 stars 472 Reviews |
| Flange Type | Bolt On |
| Item Part Number | 27421-99C |
| Manufacturer | Czsmbt |
| Model Number | C917543z481 |
| OEM Part Number | 27421-99A, 27421-99C, 27465-04, 27490-04 |
| Recommended Uses For Product | Motorcycle |
| Specific Uses For Product | Performance |
| Vehicle Service Type | All Terrain Vehicle, Utility Terrain Vehicle, Quad, Motorcycle, Automobile |
C**S
For what you payed, can't beat it.
I was contemplating 3 stars or 5 stars, but settled with 5. I have a 2006 Harley Sportster 1200 Custom. This carb fit perfectly, no issues with that, the bike runs great and I'd certainly recommend buying the carburetor. That being said, I did need to cannibalize a few parts from the old carb, mainly around the throttle cable area. The plate for idle screw had to be bent so the screw would touch it. Had to swap out the new spring for the old spring and a plunger (?) which would be parts 31 and 33. Now, the diagram shows part 25 which I didn't see on the new carb because part 31 wasn't inserted where it should've been, so could've fallen out some point. Instead of using the old spring and plunger, I could've just used a small washer if available, I settled with swapping in the old parts. She fired up beautifully! You could spend $400 on a new carb from Harley, or wherever. Or you could spend less than $50 bucks on Amazon, spend a little time tweaking things into place, and have a great running bike. I'll save the old carb for parts, likely rebuild it later on. BTW, I didn't need to adjust the air/fuel screw. They've got it cranked 2.5 turns out which had the bike running beautifully. You will need to adjust the idle screw once you get the new carb in place... especially if you need to bend things into alignment. Happy customer here.
S**R
Works perfectly like the original carb used to on my 1992 Softail. Unbelievable value!!
I bought this carburetor to replace my original carb on my 1992 Heritage Softail thai I bought new back in 1992. I was reluctant to replace my original Harley Carb with a Chinese knock-off, but I needed to get the bike running fast and I didn't feel like rebuilding my old carb again. I was totally amazed with the end result. After installing this carb, which fit perfectly, the bike started right up and ran as well as it ever has in my 33 years of ownership. While I was skeptical at first, because the slider didn't feel as smooth as the stock one, and past experiences with chinese parts has been lackluster, the bike fired into life and ran like new. What's more amazing to me is the price. An original harley carb is about $800. This one was $43, came with fuel filters, fuel line, cleaners and even two spark plugs. I don't know how they build and sell such a decent product at this crazy price point, but it was cheaper to replace the carb than for me to rebuild the old one. I've only run a single tank of gas through it so far, so i can't tell you about the long term reliability, but the first tank of gas has been flawless. While I was relucted to "taint" this 'American' bike with cheap, foreign parts, I have zero regrets. If this carb stays reliable over time, this will be a total win!
S**1
Worked great
Fits great.
B**O
Great carb!
A bit of tweeking and went right in...if your upgrading from stock cv40..this carb is better!!...I went with 48 pilot and 180 main jet and couldn't be happier...
D**P
Extremely great value.
You can’t beat these copycat carb. Can’t tell the difference from the stock Harley CV 40 carb and the Harley carb has a plastic hose Nicole whereas this one has a brass one. I used it on my 04 Sportster and it runs great. Had to adjust the idle mixture screw and it is spot on and also put in a #48 pilot jet and runs great. No different than you would had to have done with the higher priced ones.
D**H
A Really Great Value
I got it today and it went right on no issues whatsoever. It was almost perfectly tuned right out of the box! It came with some extra goodies that would have cost $10-15 by themselves. Well worth $45 bucks! I don't often leave reviews but this was so good I felt I had to. We'll see how it holds up but I can't see any reason why it won't. It's great to be able to jump on the hog and get into the wind!
R**D
Very suprised!
1999 Dyna Glide. I don't write reviews. However, in this case I'm kind of compelled. I bought a gasket and jetting kit off of Amazon to rebuild the carb on my bike as it did not start this spring. My bad for not putting it away correctly, I guess. In dis-assembly, I found the accelerator pump had disintegrated over the winter so I changed that along with reseating jets and cleaning, etc. No go. It fired but would not run. I then looked for OEM carb (used or new) and was willing to accept the cost, if needed. I happened to see this carburetor on Amazon and took a chance based on other reviews. I had very low expectations based on price. To my surprise, the carburetor is very high quality. I set the air/gas mix and idle before installing it. Took a couple cranks to fill the bowl, but then it started right up. Amazed, yes I am.... Hopefully it will endure and I'll do a better job this fall putting it away for the winter. Hoping for the best for next spring! Don't be nervous about buying this one, it's basically a plug and play!
G**N
Its not a perfect fit for 1996 Harley Davidson Sporster custom 1200
I ordered this replacement carb because of all the reviews but I had trouble with the fit and once I managed to make it fit with some alteration I have had nothing but trouble. My Harley is sputtering and chocking bad. I tried changing out the jets and many diferent setting on air feul mixture screw with no luck. I believe the fault is in the choke or what the factory manual calls the enricher because the only way it will run is with the choke fully out but at way to high RPM. So sadly I will have to put my old one back in and try another brand. As I said all the reviews were positive on out of the box on to the bike with little or no adjustment. So beware if you buy and have any issues dont waste your time adjusting, just send it back before time is up. G. Jordan
Trustpilot
2 months ago
3 weeks ago