[Performance Upgrades] Install AIRBOX LID and AIRBOX FILTER on KTM Duke 390 125 250 200

Upgrading the airbox lid and filter on the small Duke is an easy process with my suggestions as to which you should consider.
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Now, I’m just a normal guy who likes working on bikes; I’m not a qualified mechanic but I’ve spent a lot of time working on bikes and most of the servicing you see is directly from the manufacturer workshop manuals. I like to show you interesting things you can do and that I’ve done with my bikes, but I can’t promise you that anything I show you will work on your bike as not everything is always exactly the same. Be careful not to harm yourself, anyone else or your bike and always be aware that if you have a warranty then changing or working on your bike can invalidate it - they do love an excuse not to have to pay out. If you have any doubt then talk to a qualified mechanic or engineer and make up your own mind.

[@adamphillips643]

This is the only guy I could find that talks more about the lower cc dukes! Best explanation I’m glad I found his videos

[@shawnh4528]

Very interesting and detailed 💯🔥

[@MotoMirius]

Appreciate that. Thanks

[@tinks43]

Great advice David. Enjoy the new lid, let her breath! Happy new year.

[@MotoMirius]

Happy new year! Thanks Dave

[@danielzito93]

Thanks a lot David! Great content as always!

[@MotoMirius]

Much appreciated!

[@nikoschorianopoulos2737]

make more videos David!!! very nice job!

[@MotoMirius]

Thank you, much appreciated

[@mohdaznanhamzah]

Thank you for sharing the info....🔥🔥🔥

[@MotoMirius]

Thank you!

[@noeserd]

Can you make a video on a dyno for how much power difference these mods makes?

[@MotoMirius]

I'd love to. Are you willing to fund it? I do intend to put the bike on the dyno at some point, just out of curiosity to see what it does.

[@noeserd]

@@MotoMirius I'd love to but i can't afford it myself hahaha 😅

[@seenthroughvisor4579]

Can you show how to upgrade to higher cc injectors on duke? Very informative videos Thank you so much

[@MotoMirius]

Yes, I will see if I can find an injector. Thanks

[@hilerionewsrhr5313]

I used a KN filter with that foam case

[@MotoMirius]

Yes, I've used a K&N with it too.

[@brodyncompton1503]

If I have a slip on exhaust/muffler on the bike with the coober intake is the bike gonna run too lean or do I need a piggyback or ECU re map?

[@MotoMirius]

It would depend how free flowing the slip on is. Probably safer to start thinking about something like the FuelX Lite

[@ricardopinto1765]

Hi... Do you consider a iridum NGK sparkplug an upgrade or just replace the bosch stock one for the normal equivalent NGK one? Thanks ❤😊 any problems regarding iridium spark plugs on this bikes???

[@MotoMirius]

Ah there is a can of worms. The iridium fanboys will get very passionate over this. I've only ever used stock and I've had no issue. Iridium is a good upgrade and there are no particular issues (there will be a failure rate in any part and attention seekers and Iridium haters will blow those cases up out of all proportion), but equally the cheaper stock part does it's job perfectly well. If you are upgrading the bike parts then typically most will go Iridium but I seem to recall that Grey Area KTM only recommend needing it when you use the thinner head gasket - don't recall exactly the point when their advice changes.

[@andrewwiltse8882]

I just had my 2019 390 dyno’d and it only cost $270. Well worth knowing it’s right.

[@MotoMirius]

Yes, it's a good idea and one I highly recommend, but you must choose your dyno carefully as it will only be as good as the operator - and some are really bad. My Sportster was on the dyno last year and I plan to have the Duke on it once I have made a few more changes to see how well the autotune really works.

[@Feenyu]

LAST QUESTION ! Sorry for the bother . Can I run a cobber air filter lid with an after market air filter free flow ? That combination is good ?

[@MotoMirius]

You can do that, but I would recommend the DNA stage 2 lid not the Coober, even if you keep your stock air filter. The price difference is not worth buying the product with less air flow.

[@Feenyu]

@@MotoMirius Alrighty ! Going with your recommendation , thanks

[@stevesmcfpv2614]

hey i got a question. i want to fit a piggyback on my duke 125 2021 thinking about the powertronic or rapid bike evo? or would the new fuelx pro+ be enough ? for now i have a open slip on, and dna stage 2. I'm maybe de-cat it in future. what do you think? try to figure it out with videos but no success. hope for your help need more power. thanks Steve

[@MotoMirius]

Hi, PT is for people who know how to tune bikes. Fuex Pro is for people who know how to tune bikes. By this I mean that they have training, qualifications and experience - not that they have watched a few videos or they have friends who think they know how to tune bikes. So your choices are FuelX Lite or RapidBike Evo - depending on how good you want the map to be, Lite is the entry level system, Evo uses more sensors so is more likely to give a more accurate map. Both work for your situation. But if you want to buy Pro or Pro+ then go ahead but start saving in case you need someone to rebuild your engine.

[@stevesmcfpv2614]

wouldn't do it myself, my ktm mechanic would do the installation and setup for me. but anyway thank you

[@stevesmcfpv2614]

fuel x pro plus says it has autotune. as well!? thats why i asked.

[@MotoMirius]

@@stevesmcfpv2614 Yes it does. But you need to think how that autotune works. I has 10 'maps' which are effectively AFR targets - so they supply different levels of fuel. So it 'autotunes' to that fuel level. But how do you know you have chosen the right fuel level? You might have chosen one that supplies too much or too little fuel. With the Lite, the unit can adjust to whatever it needs. If you have chosen a 'map' on the Pro that is too lean for a part of the rev range, the Pro is prevented from adding the right level of fuel by the limit of the chosen map.

[@stevesmcfpv2614]

thank you a lot are really a genius at this topic.

[@bisagni09]

Thank you for all your videos! They helped me alot on upgrades for my 2022 ktm duke 390, protection included. I had a question and was hoping you could help. I use a slip-on exhaust and got an airbox lid cover from Bagaros, (eventually in the future I might change to a Coober one). But in my setup where I don't want to De-cat my Duke, should I get a piggyback ECU or just avoid it since I only run and Airbox lid and slip-on? Thanks you again!

[@MotoMirius]

Thanks, appreciated. If you had an earlier bike you might well be OK, but with a BS6 emissions bike I'd be tempted to run something like the FuelX Lite just to be safe.

[@bisagni09]

@@MotoMirius Ah understood, thank you so much for the suggestion!

[@SBMotoZ]

Thx for info I have a 390 Adv Just installed FuelX Lite, and K&N filter, if I add the DNA air box Lid. Will the Fuel X lite be enough to compensate for max air intake ? Also, I’ve heard the Coober Foam type air box lids can disintegrate and clog up the throttle body Is this true ? Thx

[@MotoMirius]

I see no reason that an airbox foam would disintegrate - they are designed for exactly this use and will not be compromised by any petrochemical normally used around bikes - fuel or oil - in dirt bike use they are often oiled. Now put a bit of random foam on there and.... who knows! Yes, the FuelX lite designed to do that job according to the manufacturer - but as per the next video at some point you will run out of fuel injector so the fuelling device can't compensate when you exceed the physical capacity of the bike to deliver fuel.

[@lazangbhutia283]

@@MotoMirius Would bigger injectors help with the above issue?

[@MotoMirius]

@@lazangbhutia283 Yes - if you have a fully modded airbox and a free flow exhaust then you will need a bigger injector - or some other solution to increase fuel supply.

[@serhiy8615]

@@MotoMirius Hello thank for you content on channel. I want to ask if there is a possibility to rise fuel pressure and in such way give more fuel through the same injector. I know that it's used in cars often.

[@allentig]

What about an after market air box or air box delete to cone filter?

[@MotoMirius]

Not many aftermarket airboxes about. You could build one, but not sure if worth the work - nothing especially wrong with the stock box. You can replace with a cone filter and there is the Chimera conversion which is popular. But, mostly cone filters are for track days or for looks - there is no waterprotection which can and does block them leaving the bike broken down in heavy rain. Airboxes are used by all vehicle manufacturers for a reason. Chimera self describes their conversion as a cold air intake - but I don't really see how this is possible given the location of the filter .

[@rickiedalziel6720]

I have a 390 with bmc air filter, Leo vince exhaust and power command 5. Could I benefit from adding the coober filter lid aswell? Thank you.

[@MotoMirius]

Yes, it will help. Or if you want a lot more airflow you could use something like the DNA stage 2 filter lid. Of course you need to update your PC map or be using the autotune module

[@TheBigBlueMarble]

I am new to the KTM world having just purchased a 2022 KTM 390 Adventure. By replacing the stock air box cover with the filtered cover from DNA, won't you be allowing air into the engine that is less filtered? The increased flow is excellent, but isn't less filtration (especially off-road) going to eventually cause issues?

[@MotoMirius]

Yes, there is always a trade off in improving performance - if you are racing off road then winning is always worth the cost. For the road use of a Duke it's less of an issue, for the Adventure you might choose not to use higher flow like the DNA but consider the foam filter lids instead.

[@Ss-jx2eo]

What do you think of the chimera cold air intake??

[@MotoMirius]

You will find my answer to that in the next video, but I don't regard it as a cold air intake as it sucks air from around the engine and exhaust.

[@cmcravo]

I have the same mods, airLid from DNA and filter from KeN Fuelx and PT ECU but on default setting as I didnt have the time to go to a shop and tune it, but its started running rough with the LID, even tho im on setting 6 on fuelX(thats what the lite tries to acomplish, any more than that and its too much fuel and the bike drowns)... Im checking the spark plugs to be sure but im really disapointed so far. Bike has 40k KM.

[@MotoMirius]

I’m a little confused why you went with the PT and then added the Pro. Both require you to be able to manually measure and adjust the fuelling. Neither unit are what I would recommend for Street riders with no access to either a Dyno or expert help. Why did you choose the Pro instead of the Lite?

[@cmcravo]

Tbh, If i did it again I would go the other way, but at the time i wanted to be able to change the afr ont he fly, Had the wrong idea how it worked and was still learning about mixtures and maps. But the lite tries to acomplish the level 6 of the PRO@@MotoMirius

[@MotoMirius]

@cmcravo Lite doesn’t try to emulate setting six. Six bumps the whole map up by a fixed increment, so some parts of the map will be right, others not right. Lite works as Aututune to what RD thinks should be the safe AFR range. But it’s only an entry level system.

[@samnation9887]

I have a 2016 ktm 390, does the 2017 air filter mod work on the 2016? Are they the same?

[@MotoMirius]

No. As explained in the video it is a different airbox. You can remove the top of the airbox on a 2016 and fit a different filter instead - the "open airbox" mod.

[@Ss-jx2eo]

I installed the lid and decat and i have the fuelx lite on my duke 125 and only the red light flashes on the fuelx. What does that mean? Is that OK??

[@MotoMirius]

Yes, the light flashes red once it's activated

[@Alex_GTi]

Quick question here, if I install either the dna air filter or the dna airbox lid on the bike, not both at the same time, is it necessary to install any piggyback ECU? Because I want to keep the bike as stock as possible and don't mess with the electronic section. Thanks.

[@MotoMirius]

Filter should be fine so long as you've done nothing else. Stage 2 filter lid and I'd recommend a piggyback. If you choose something like the FuelX Lite or the RapidBike Evo, they are plug and play, so no messing with the electronics. There is some disassembly of the bike required to get to the connectors, but it's easy enough and you just unplug and remove when you want to return the bike to stock. The bike will run just like it did before - some countries you can up the rev limiter with the RB Evo, and you have no worry about the fuelling being wrong.

[@Alex_GTi]

@@MotoMirius Yeah I get what you are saying about disassembly, I have seen your other videos, I think I will just stick with the air filter for now. Thanks a lot and keep up the good work!

[@ginPP]

what about the Gen 1? is the filter enough or is there a lid mod as well?

[@MotoMirius]

Gen 1 mod is to remove the lid (hence the name "open airbox" mod)and add one of the gen 1 filter upgrades

[@Exonic_]

Would a fuelx lite be good enough for running both the air filter cover and the actual air filter with a full exhaust? Or would a proper power commander be needed?

[@MotoMirius]

The manufacturer says that it is enough for that. The issue with Power Commander and PowerTronic units is that they run fixed maps that really need to be setup for your bike - they come with some stock maps but they are really just base maps - they won't automatically be correct for your setup and where you live. PC do sell an autotune module to overcome this.

[@jm9051]

​@@MotoMirius the Fuelx Lite automatically adjusts to the temperature, air pressure (..) + filter and exhaust, so FuelX should also notice the DNA Stage 2 and adjust the fuel mixture?

[@MotoMirius]

@@jm9051 Lite runs off the O2, not the other sensors, it doesn't notice or care what modifications you have made. If you intend to make serious mods to the bike then I would look at a full autotune piggyback that runs off all the sensors you mention like the RapidBike Evo. The Lite is good, but it's an entry level product so if you are going to invest in serious mods why wouldn't do the same with the piggyback?

[@jm9051]

​@@MotoMirius Thanks. I just updated the chain sprocket (13), an k&n airfilter and bought the fuelx lite - that's enough tuning for me :) thank you for your response and yes, you are right. Just read the description for the fuelx lite again.. my "setup" works good for the duke my23..maybe i will update it with a RB Evo in future..thx!

[@MotoMirius]

@@jm9051 You are very welcome and thank you!

[@BMF-NJ]

What fuel injection please would need to get if I get the both dna filter I have the air box lid already

[@MotoMirius]

I would recommend you discuss with Grey Area KTM as they have the testing and can recommend the right injector for your setup.

[@BMF-NJ]

@@MotoMirius had question can I fit 790 break cylinder on the 390

[@MotoMirius]

@@BMF-NJ If the handlebar size is the same I don't see any reason why not but bear in mind it's a larger capacity unit as it's designed to run two calipers.

[@Feenyu]

Is it necessary to change the air box lid and air filter if you have a no pre - silencer bike with slip on . More like free flow exhaust?

[@MotoMirius]

It all depends what you are trying to do. It isn't necessary but a good airbox lid such as the Stage 2 DNA will improve airflow and make the bike louder.

[@Feenyu]

@@MotoMirius will effect performance if I just change the exhaust ( free flow ) but leave the air box lid and filter stock ? Does it cause any harm in my engine ? ( fuel x lite will be installed with this set up )

[@MotoMirius]

@@Feenyu It won't cause any harm, but you will not obtain the full benefit from a free flow exhaust is the inlet is still restricted. If you are looking for performance then you might also want to look for a more advanced piggyback ECU than the FuelX.

[@Feenyu]

@@MotoMirius Not performance, just looking for better sound . Bought the mid pipe link that connects on the cat on my KTM 390 Duke 2021 . Fuel x lite and people were telling since I will be removing that pre - silencer to obtain better sound , I will also need to change the air box lid together with the filter inside . That was my doubt . I was scared the fuel x lite won’t be enough for the exhaust and air filters mods .

[@Feenyu]

@@MotoMirius can I just mod the airbox lid leaving the stock air filter inside ?

[@pedroplatzerdamotta]

Where can I find that DNA air box lid in London?

[@MotoMirius]

Online. It's a specialist part - not many places will stock it

[@pedroplatzerdamotta]

@@MotoMirius Thanks!

[@nicholassmith6983]

Hi mate a bit off topic but what is the best spark plug for the Ktm duke 125 year 2019

[@MotoMirius]

Stock is fine, some people go Iridium because it's trendy but I've also seen people going back to stock from Iridium. Unless you are racing I don't think it has a major impact.

[@nicholassmith6983]

@@MotoMirius ok thank you mate also I’ve just brought the rapid bike evo and the Ktm air filter lid not fitted yet but will I notice a difference also would it be better to add a full exhaust or just a slip on

[@MotoMirius]

@@nicholassmith6983 I would suggest a slip on and a cat (not presilencer) delete. But you can just run the airbox lid. None of the changes are big but they tend to be cumulative.

[@nicholassmith6983]

@@MotoMirius I was going to get De Cat Eliminator Pipe + 230mm Round Blue Tip Carbon Silencer Kit black widow

[@MotoMirius]

@@nicholassmith6983 Black Widow have a good reputation and make good exhausts. There is no best exhaust, only what you like best and what fits your budget (just don't buy fake stuff ). I prefer the decat, but I don't recommend replacing the presilencer (black box) unless you are using a pipe which has a resonator unit in it, otherwise it tends to be too loud and you can lose a bit of mid range power.

[@darrenandrews5523]

Changed airbox lid on my 790 made no difference

[@MotoMirius]

I'm not someone who believes that changing one thing makes a huge difference - normally it's a part of a bigger picture.

[@marcbibeau1416]

Much prefer the DNA top filter which uses an actual filter instead of just foam…

[@MotoMirius]

Depends on how much air you want to flow. I wouldn't recommend the DNA lid to someone riding a bike without a fuelling device to compensate. Personally I run the DNA filter lid.

[@marcbibeau1416]

@@MotoMirius right, but I mean using a foam to filter air just feels like a bad idea. Also, depending on foam density wouldn’t the foam let more air thru than an actual filter like the DNA?

[@MotoMirius]

@@marcbibeau1416 It's airbox foam and designed for exactly this use. Most two stroke dirt bikes use airbox foam filters because they withstand getting wet better than the DNA type filter and the lid has a risk of getting wet to some degree. Yes, depending on what foam you use, it will filter more or less air, but the DNA lid is classified as stage 2 not stage 1 like the Coober foam lid because it lets more air though.

[@yahoodlums]

Not trying to be a hater. I like your channel very much. But, I don’t really understand why you would shell out for a power commander, a DNA filter, modify your airbox, or run a slip on or delete the cat on a ‘cheap’ 44 bhp bike? Surely the gains will be minimal and you risk making your bike run poorly by tinkering with the fuel ratios. Why not just save up for a more powerful bike??

[@MotoMirius]

It's a good question and one often asked. There is a massive car and bike modification market out there that caters for the insanely popular hobby of making 'pointless' modifications to vehicles where that money could be 'better' invested in a more powerful vehicle. Does it make sense? No, generally not, but that typically applies to every hobby from golf to train spotting - why people are willing to spend hours walking round a golf course pulling a bag of golf clubs that easily cost more than my Duke, I don't really 'get' - it's not an efficient form of exercise. One of the problems with bikes and cars is that even this 'cheap' 44 hp bike is more than enough to break every speed limit in almost every country. Yes, you absolutely can buy a more powerful bike but that just means you go from utilising 95% of the power on the 390 to 10% of the power on the 1290. I suppose the simple answer to your question is that this hobby isn't for people who are saving up for a more powerful bike - it's often for people who could afford a more powerful bike but choose not to. As to the running poorly - yes, but the reality is that these bikes run poorly from the factory - the fuelling is absolutely not what KTM would choose for the bike, it's what KTM can get away with whilst still meeting emissions regulations.

[@yahoodlums]

@@MotoMirius Sorry, just saw your reply. Appreciate your well thought out answer. I do get he whole 'modding/enthusiast' scene, and I also understand it's an emotional hobby so logic doesn't always apply. I guess the best way to see how much difference your mods to the 390 have made would be to Dyno it, you could then have the fuel map fine tuned to get the optimum ratio. Is that something you have considered?

[@MotoMirius]

@@yahoodlums I've often considered putting it on a dyno. Partly curiosity as to how much if anything has changed, but also just how well a map the Evo has built. Maybe this year I will. But probably I will swap the Evo unit for the Race version and then do it.