1981 KTM 390 Part Upgrades

1981 KTM 390 product list of Upgrades & Parts we sell!

Showing 135 results

    Your Cart
    Your cart is emptyReturn to Shop

    Dealer Discounts

    Dealers, race teams or repair shops…
    We’ve got something special for you!

    Register for a free account as a Dealer and get exclusive access to 15% off on everything you buy from us.  It’s easy…

    (1) Register now or log-in to your Dealer account.

    (2) Connect with us to verify your Dealer status. Just send us an email with information about your shop or shoot us a video on Instagram showcasing what you do.

    (3) After you’ve spent $1,000 with us, you’ll qualify for the 15% off discount.  Don’t worry if you’re not verified yet… once you are, we’ll reimburse you for 15% off on everything you purchase over the initial $1,000 buy-in threshold, and from then on your discount will automatically apply to everything you add to your cart (just log-in before you shop)! 

    Shop today and you’ll be getting 15% off everything you buy in no time!  

    Reviews

    4.6
    4.6 out of 5 stars (based on 453 reviews)
    Excellent75%
    Very good12%
    Average12%
    Poor0%
    Terrible1%

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    Mr.

    July 21, 2024

    555

    zFPWdwPk

    1991 cr500 airbox assembly

    June 3, 2024

    When I couldn’t find the part on a single other website I found oemdirtbikeparts & let me tell you I was thoroughly impressed with how he had one in stock & was very easy to talk to regarding the condition of the used one vs the new. Excellent customer service 200% will be buying from Boston again.

    Graydon Book

    Long shipping time yet worth the wait!

    April 2, 2024

    I have a Husky 501 that I went all out on with brighter lights, KYB forks, and better wheels. took about 45 days, yet I’m beyond pleased with the Organization of this company!

    Chase

    Custom Build

    March 10, 2024

    Have a 02 yz250 I wanted to make my own. With the help of Boston we decided to do 24 yz450f swingarm axles rear brakes 18mm by 50mm kyb a kit rear shock with sss forks and Brembo brakes! Really happy and lost 10lbs with the help of their wheels. Looking to do ti bolts but I think its more than enough as is and I’m very happy compared to my ktm 150 2022 model. Thx for all the help with my endless question. Tip with work with this company… buy some items then ask as at first they blocked me for asking 10 questions then not buying anything which I know understand they get over a 100 emails a day and Boston was the only guy that truly could help me do this correctly and I am astounded with his knowledge and quickness of responses on all of these unique questions I had!

    Heath

    Stark Varg Dirt Bike Mods!

    December 30, 2023

    Stark Varg Dirt Bike Mods!

    My new stark varg is a piece of art, we just added suspension coatings, tunning, and works Brembo brakes to start, waiting on the new A60 Rims and titanium bolt kit to complete this already amazing bike! after 40 year of motocross riding this bike is a game changer especially with adding a dual hand and foot rear brake set up! Thx team really an enjoyable experience

    Gary now an Electric dirt bike lover!

    Carbon handlebars

    December 19, 2023

    They weren’t kidding these are 70% lighter and feel great and im 6ft 2 so they’re plenty wide, about a 1/2 inch narrower than my stock set up yet i like this.

    Hector

    Helped fix my issues

    November 14, 2023

    Took a while but well worth the wheels and fork combo

    Derick

    MY idea of therapy

    August 28, 2023

    I like to ride a bike and then see how one can improve the design and with the help of Boston and His team, we have done such many times these past few years! Thx for keeping me sane!

    Chuck

    Dual sport build

    August 4, 2023

    Purchased a used fe501 because I wanted to build it from the ground up. Paid 9000 for a 2020 with 600 miles that had a slip on pipe. Talked to Boston and he said to sell off all the parts we weren’t going to use. After getting 3500 back for the parts I was in a street legal beast for 5500 then I dropped around 8000 in this bike… with about 50 hours of work its a 60+ whp do anything machine. Wheels, forks, throttle body, ECU, brakes, crazy bright lights and shed over 15 pounds from stock. Can outrun any street bike in an urban area and still enjoy a motocross ride at my local track. A great feeling of accomplishment is felt every time I take it out!

    Kent

    custom dirt bike wrap!

    July 13, 2023

    I wanted purple plastics for my husky yet no one made it so we did black plastics with dark matte purple which turned out excellent, very trick to have an all-black bike with matching plastics to the bolts they sell!

    Frank

    KTM build

    June 5, 2023

    With a world that’s unknown the bike make me feel free to whatever comes my way for the last decade I’ve had this company help me with my modifications on my bikes and yes they take time to get me the part yet its done right every time!

    Vance

    Front brake mod -

    May 15, 2023

    After seeing the Stark Varg E-bike running Yamaha forks with Brembo brakes I wanted to see why so I tried this on my 23 yz450f with their works front brake kit. For $1000+ dollars I wasn’t sure it was worth it yet when I use my front brake 100+ times a moto it was highly noticeable when finger strength later in the 45-minute GP. I 100% recommend this company yet plan it out and be prepared to wait 4-6 weeks as it did which was worrying until I asked my friend who knows the owner from riding with him at the Glen Helen 24 hours!

    yz450f 23 guy

    Customer experience

    March 7, 2023

    First off 5+star rating from me. I ordered parts from them twice now and no problems at all the only thing that made me nervous was how long it takes to ship parts but dont be worried you will get it. They get the impossible parts you cant get else ware discontinued parts aswell no problem for them. Be patient and play nice. If it was not for them my bike would be a bucket of bolts scrape yard. Keep in mind their making the impossible possible and bust their ass doing so for you. Be thankful their here . I cant thank them enough oemdirtbike parts are the real deal. I could hug them for what they did for me

    Yamarama

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

    March 2, 2023

    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 OEMdirtbikeparts.com

    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

    March 2, 2023

    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 OEMdirtbikeparts.com

    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

    January 13, 2023

    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

    Great

    December 8, 2022

    Ordered shipped the next day and got it 3 days earlier than expected.

    Elijah

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

    August 29, 2022

    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

    August 2, 2022

    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!

    Guy

    Titanium Bolts make me a pro again 😂

    June 10, 2022

    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.

    Chad

    wrong seal kit sent

    May 5, 2022

    waiting on response from seller to correct the order.

    steve

    Response from OEMdirtbikeparts.com

    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.

    May 5, 2022

    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.

    Shad

    Great customer service!!

    April 28, 2022

    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 OEMdirtbikeparts.com

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

    Cr parts

    April 9, 2022

    They have Rare parts👍

    Keil

    Fully custom Cr125 build

    April 3, 2022

    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

    April 2, 2022

    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.

    Tommy

    oem swing arm

    March 18, 2022

    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!

    March 11, 2022

    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.

    February 25, 2022

    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!

    Rich

    Great business

    February 4, 2022

    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)😂

    January 26, 2022

    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

    January 11, 2022

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

    William Thompson

    Brembo brake upgrade for my yz450 22

    November 18, 2021

    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…

    Kade

    Response from OEMdirtbikeparts.com

    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!

    November 18, 2021

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

    M Hale

    Amazing service

    October 29, 2021

    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

    October 7, 2021

    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!

    Casey

    Accurate and precise

    October 6, 2021

    The delivery was on time and the parts were correct.

    Jeff

    Built my own custom dirt bike!

    October 5, 2021

    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.

    Brandy

    Best carb upgrade for my super moto.

    July 28, 2021

    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

    April 23, 2021

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

    Brad

    Easy to find parts

    April 3, 2021

    It’s easy to find parts for my bike with this “Browse By Bike” search thing. Thanks OEM.

    Chris M

    Excellent

    January 28, 2021

    Item Looks brand new

    Mike barnwell

    Good guys to get parts from

    January 24, 2021

    Had a few questions on a Sunday evening and they got back with me quickly. Good price and great service. Can’t beat it.

    Jonathan

    Ktm kickstarter

    November 27, 2020

    Fast shipping quality parts

    Dustin

    The ONLY place to go for your bike parts ! Like family !

    November 23, 2020

    These guys know their stuff ! If they don’t have it, they can get it ! You will be well informed about your parts, and well informed during the whole process of your order ! Shipping is unbelievable ! Arrived in South Ga. In a matter of days ! After you make a purchase from these guys, you won’t bother looking elsewhere ! Don’t feel intimidated to ask questions, you will be well informed and actually feel like your question was answered ! Thanks again guys, look forward to future business ! Total dedication to customer support and getting exactly what you need ! Doing it right the first time !

    J. Ridings

    Response from OEMdirtbikeparts.com

    Much Appreciated!

    Ktm forks

    November 6, 2020

    Kyb forks are the way to go hence why there on gas gas bikes! “red ktms” thx OEM team

    G

    Parts I needed shipped fast at a low price

    October 25, 2020

    All of my needs were meet.

    Eric J Castro

    OEM Dirt Bike Parts- TEAM

    October 6, 2020

    If your looking for parts, these guys know how to get it ! Even though I spent a whole day cleaning before the install, I’m satisfied at this point ! Great communication, and response times are excellent ! Thank you !

    Jamie Ridings

    Very quick

    August 25, 2020

    The delivery of my part was very quick seamless and they kept me in the loop every step of the way.

    Tony

    yz250 parts

    August 23, 2020

    thanks for fixing my issues with the 02 suspension and setting us up with new forks shock!

    Brook

    KTM

    August 23, 2020

    Good price

    Christopher
    Check the Q/A section on the Product Pages for better response time and answers!

    Check the Q/A section on the Product Pages for better response time and answers!

    Text 19515957838 your year/model & exact part needed to see if we can help! For international buyers please reach out on Instagram for easy communication @oemdirtbikeparts.

    Shipping & Returns help are on the bottom of this website as those are no longer handled in this section.

    Browse By Bike





    Finding parts...

    Loading product list... this can take 10 seconds or more.

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