Keihin Dirt Bike Carburetor Kit for Sale – Complete Carb Upgrade Assembly

Does this product fit your bike?

(3 customer reviews)

Retail Price $1,513.99
Our Price $749.90

Availability: In Stock (Changes Daily)

Welcome to our store!

Dirt Bike Part for sale info below 

Keihin FCR MX Dirt Bike Carburetor 

This is the newest version (#3) of the Keihin FCR Carb which offers many fine-tuning options along with many updates and performance upgrades, allowing this carb to perform best in any situation. This is a rebuilt option (pink hose pics) click our new option above for a new in box then upgraded by us assembly. 

Need Help Click here!  

The Difference between this Carb upgrade and other OEM or Aftermarket Dirt Bike options.

  • Advanced TPS sensor (ready to plug into the wiring harness.)
  • New adaptor boots (for easy install, and runs the bike’s throttle cover to keep dirt particles out.)
  • Tuned for each order (please include in the order notes page: elevation, bike mods, mileage, and riding style.)
  • Upgraded Baffled float bowl (allowing fuel to flow in any angle that the bike is leaned: whips, wheelies, off-roading, etc.)
  • Correct needle (allows for a smooth power band and the ability to pull endos without stalling the engine.)
  • Black Neoprene Genuine Keihin hoses (these remain functional 3 times longer than the Keihin OEM Pink hoses.)
  • Note: These carbs are set to order! Tuned carburetors do not require constant jetting unless there is a +/-3000ft change in elevation, but even then a simple adjustment of the fuel-air screw and idle can maintain a properly running engine.
  • “No need to sacrifice power for the worry of jets
  • The product photo is for reference only, the part you receive will be specific to the make and model of your bike

This carb was designed in Japan specifically for a 4-stroke motorcycle!

Two-stroke carbs (such as Lectron and Smart Carb) work well on all engines! The problem is, 4-strokes take twice as long to produce a “power stroke”, where both the TPS and Accelerator Pump Preload the Spark timing and fuel before the engine has to produce the vacuum needed to get a two-stroke style carb operational.

This video shows a completely stock DRZ400 with only exhaust and this carb upgrade. The conjunction of these two products working together will produce over 25% more horsepower and a 29% increase on the torque curve.

We also have a “Two-stroke style option” for a more economical modification.

Below is what will be included with this Dirt Bike Carburetor when all upgrade option buttons are selected above:

  • Main & Mid Body
  • Float Bowl
  • Throttle Slide
  • Roller Plate
  • Throttle Position Sensor
  • Throttle Connector & Spring
  • Fuel Inlet Valve
  • Accelerator Pump Upgrades
  • Tuning and Jets set for each order
  • Needle & Seat Valve
  • Hot-Start & Choke Knob
  • Fuel/Airscrew Billet Adjuster Upgrade
  • Easy Idle Adjust Knob
  • Complete OEM installation of Keihin Gaskets

Free Shipping

Free shipping
within the continental US.

Product Options

Upgrades and/or product condition options are available for this part.

30-Day Guarantee!

No need for returns when compatibility and product quality is covered.

On the checkout page, we require the exact year and model to ensure a perfect fit.

Please include your exact bike year, model and sub-model (along with any questions/comments) when checking out as we have multiple variations available.

3 reviews for Keihin Dirt Bike Carburetor Kit for Sale – Complete Carb Upgrade Assembly

Based on 3 reviews
5 star
4 star
3 star
2 star
1 star
  1. Aaron C. (verified owner)

    Very helpful. There was a slight issue with the fuel intake swivel, but they were eager and happy to help resolve the problem

  2. Lindsay

    thanks for the help! way better price and starting than the stock dealer carb! saved $200 over dealer quoted price.

  3. Casey M (store manager)

    Purchased because the part was the cheapest, im back because of the performance and ease of a biz to deal with. thanks, NOZ motorsports AZ

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Is Shipping Included?

Yes, there is free shipping on all Keihin Dirt Bike Carburetor Kit for Sale – Complete Carb Upgrade Assembly‘s in the continental US.

Is fitment guaranteed?

Yes, when all options are selected for the Keihin Dirt Bike Carburetor Kit for Sale – Complete Carb Upgrade Assembly, fitment is guaranteed.

Do you ship worldwide?

Yes, we ship all products internationally for an additional cost. Additional shipping costs for a product will show when your region is selected on the checkout page under shipping.

What is your product return policy?

With any Keihin Dirt Bike Carburetor Kit for Sale – Complete Carb Upgrade Assembly for sale online, PayPal and credit card are covered by a 30-day return policy.

How do I speak with a live agent?

Click on the dirtbike helmet icon for a quick email/call or text-back response to any question you may have.


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Did you know we offer FREE SHIPPING in the U.S.?

Rated 4.8 out of 5
4.8 out of 5 stars (based on 390 reviews)
Very good14%

Took a while to receive all products yet well worth the wait!

Rated 5 out of 5
1 day ago

Had a dream to build a kx500 dune bike that could hit any jump I threw at it. We started out by sending the shock and their KYB fork upgrade kit to Graeme Brough with custom excel a60 rims to match. Brembo brakes were added as well yet more of a want than a need. the biggest upgrades from me were the custom bored 41mm PWK Keihin short body and KYB forks set up for the dunes. the bike is also 15 pounds lighter between all the work we did with the titanium parts and newer suspension and wheels etc. Already had a buddy offer $15,000 after I’d hammered this thing for a year so had to stop by and leave a proper review, as most times in life we forget to say thanks to the people that helped make our thoughts a reality.

Austin C

Response from

Yes, at this time most items will take some time to ship please contact us via 9515957838 via text with the exact year model, and product needed to see if we can ship quicker!

No Delivery

Rated 1 out of 5
1 day ago

I ordered a part Nov 7th, have yet to receive it nor receive a refund have made many attempts to contact oem about it and ask for a tracking number because i had never received one. communication would be nice since i paid 885.37 on one part

mik braska

Response from

Hi Mik, We’ve tried reaching out twice to discuss the best options for ordering the Husaberg 570 wiring harness components as it’s a special order from Austria, and will take a long time to source these rare items.

Titanium bolts

Rated 5 out of 5
1 month ago

I really just bought these to upset the boys at the track yet it’s nice when they make fun of the purple hue, then I slide in some knowledge that they are pvd coated for 50% longer wear coefficient

Jill Boydon

All good. Now it's a motorcycle....q

Rated 5 out of 5
6 months ago

The 41 mm carb upgrade really transformed the DRZ400sm from a hopped up scooter to a real motorcycle. The bike started up within three or four revolutions. I was astonished. Warm weather in Florida no choke and it idled perfect. Exactly what I told them I wanted, is exactly what they gave. After months maybe a year of adjusting the jets on my motorcycles I’m happy to say they know exactly what they’re doing and I have no intention changing anything. After warming it up it took a good 30 to 45 seconds to dial in the carburetor and get the mixture and idle perfect. Everything I needed came with the shipment and they have a great video on YouTube that walks you through it. The video was unnecessary it was so easy. I watched it after the fact just to make sure I didn’t miss anything. Thank you for coming through better than advertised….. Cristian

Cristian Dorney

Dirt Bike build

Rated 5 out of 5
7 months ago

Customizing my life is what I do and my supermoto build was no different they helped me with some tough to find product and showed me a few trick to really get this 501 to its happy place!


Titanium Bolts make me a pro again 😂

Rated 5 out of 5
8 months ago

Back in the day when I was racing GNCC lightening the bike was the name of the game yet now at 52 It’s more like building what I only once dreamed of. This was a lot of money for some bolts yet I can tell the chassis is stiffer and makes the bike look like the rest of my KTM 500 that’s got way too much money into it. I consider this sport a drug and I must say this is one of the best ones out there! Thanks for all the help.


wrong seal kit sent

Rated 2 out of 5
10 months ago

waiting on response from seller to correct the order.


Response from

This was an eBay purchase, this is exactly why we think is best to include your exact year and model when ordering. Ebay we have many issues with customers having trouble finding or even worse their bikes are miss-matched with aftermarket or upgraded parts so its best to send a picture and VIN if unsure!

Take care of there customers.

Rated 5 out of 5
10 months ago

Had a mix up on the size of my wheel I ordered. Its was corrected right away and got my wheel very quick and in great condition. Will do business in the future with these guys.


Great customer service!!

Rated 5 out of 5
10 months ago

I am highly satisfied with the service I received from oemdirtbikeparts. The parts that I had ordered were on back order so they went ahead and sent me the whole assembly already put together. I was not expecting that and I was pleasantly surprised. Will definitely be doing more business with them!!

Robert Nicholson

Response from

Y’all are the reason we still offer parts to the public!

Cr parts

Rated 5 out of 5
10 months ago

They have Rare parts👍


Fully custom Cr125 build

Rated 5 out of 5
11 months ago

The swingarm was toast on my 02 cr125 from the old owner’s neglect. Now Honda hasn’t made this rear arm for over a decade and no one had a reasonable option. When I heard they helped Justin Barcia win supercross on the Factory Connection team with a longer swingarm I felt at peace having them solve my issue. Not only does it look better it’s a 1/2 pound lighter.

Kevin Robinson

Great service

Rated 5 out of 5
11 months ago

I initially had questions about the difference between 2 different master cylinders. I typed up a question and then received a phone call about an hour later and was given a thorough explanation of the difference along with some other tips. The parts showed up quickly and we’re just as described. Awesome experience.


oem swing arm

Rated 5 out of 5
11 months ago

i was looking for a swing arm for my cr250r everyone i found looked like they where road hard and put away wet came upon oemdirtbikeparts they had a new oem in the box. i could not beleave it i bought it in a heart beat. they have more new oem parts i will be buying more this company is the best when you text or leave a message they get back to you. it would be better to talk to somebody though

Robert Segool

Custom supermoto wheel set!

Rated 4 out of 5
11 months ago

Quality and durability is amazing, I jumped down a set of stairs and have been hammering this new supermoto 501 for months at the local sumo track with not one spoke coming loose! Can’t say that for my last few bikes thanks for supplyin such a dialed product. Shipping was super slow yet I guess ya can’t rush art!

Jeff Till

Huge inventory. Very helpful and knowledgeable people.

Rated 5 out of 5
1 year ago

My 2020 DRZ 400S was parked curbside while I was at work. Some dumbass ran into it and damaged the front forks and caused various cosmetic damage. I was devastated. I love my bike and have thousands into perfomance upgrades. A quick search into my options turned up OEM Dirt Bike Parts. 1 quick email and I was promptly contacted by Boston to let me know what my options were. He quickly put together an upgraded package (DLC upside down front forks to replace the conventional forks as well as all the goodies to go with it). We agreed on a very fair price and within hours I had received tracking info. The parts arrived quickly and upon inspection I noticed a slight bit of leakage from one of the fork seals (nothing malicious here, just shit happens). I reached out to Boston and not only was he apologetic but also offered me several options including return with a full refund. I really like this set up so I took him up with his offer to send me parts to fix it and cover any labor costs. In addition he offered me a store credit to make up for any inconvenience. He is a stand up guy who obviously has a passion for motorcycles as well as his customers. I will be using his shop exclusively at this point. Thank you!


Great business

Rated 5 out of 5
1 year ago

Completely satisfied. I ordered my part and it was filled the next day and delivered first class mail. I received my part a day early.

Levi Jernigan

Great customer service! (Stupid customer)😂

Rated 5 out of 5
1 year ago

I had some trouble getting the carb linkage delivered. It was returned to sender twice and turns out it was my fault (old change of address). But I reached out to these guys and they helped me the whole time. Even during Christmas and on the weekends they were texting me and resending my parts. Got them delivered and installed tonight! My customer will be very happy he doesn’t have to buy a new carb just to get the linkage. Thanks to all of you guys at OEM I will definitely be using you guys again.

Joe Livingston

Kick starter shaft

Rated 5 out of 5
1 year ago

Great customer service. The only company that had the part I needed. Part arrived fast.

William Thompson

Brembo brake upgrade for my yz450 22

Rated 4 out of 5
1 year ago

I love this steed yet the front brakes with all this power don’t add up once hot. Went to a larger master and this brembo caliper which is sick looking! Very satisfied even tho it took quite a while to ship…


Response from

Very sorry for the long shipping times on this one, Brembo calipers are hard to get and with this new shipping delema we do pre order as many as we can yet still no control on some shipping times for the rest of the year.

brembo brakes for my cr250 two smoke!

Rated 5 out of 5
1 year ago

cool too have a company like this around hope they can keep it 💯 and make more shitaki like this!

M Hale

Amazing service

Rated 5 out of 5
1 year ago

The carb i ordered came amazingly quick and everything was as described. The service and support i received was also excellent.

James Torcov

Dirt bike modding

Rated 5 out of 5
1 year ago

Love riding yet I’m not who I once was on a dirt bike. So now I like to feel the difference when I add parts to my ktm. This year I purchased multiple upgrades from OEM- brembo, KYB and custom rims to name a few, I’m not sure if my lap times are any better but boy is it a safer more precise ride! Thanks for answering all my questions and sharing knowledge that I didn’t even know existed!


Accurate and precise

Rated 5 out of 5
1 year ago

The delivery was on time and the parts were correct.


Built my own custom dirt bike!

Rated 5 out of 5
1 year ago

I purchased a drz400 from the OEM dirtbike parts team and they helped me make it my own! At first the drz was a great first street bike yet with time I had more enjoyment off-road. So with the help of Boston we turned it into a dirt bike I could ride to the trails and still be able to commute to work! After 10,000 miles I’m really glad I picked this bike and had the support of this company to guide me with the upgrades to purchase.


Best carb upgrade for my super moto.

Rated 5 out of 5
1 year ago

Went from a stock carb on my Drz400 to a lectron thanks to some paid advertising YouTube influencer.. the carb worked but after riding my friends with a fcr39mm I couldn’t deal with bottom end power loss from the lectron carb. Wish I didn’t cut my tps wire so I could use the 2nd map plug in but still way better! Might buy a wiring harness and get my tps back to even better this reliable daily driver!

These guys are right “wheelies night and day better with this set up as well! “

Steve abbot

Awesome place

Rated 5 out of 5
1 year ago

Honest people. Quick shipping. Will recommend and buy all the parts I need from them. Thanks OEM


Easy to find parts

Rated 5 out of 5
1 year ago