Stubby The Stock Exhaust KTM 390 125 200 250 Duke

[@spikev5842]

Thanks for a great detailed video Two suggestions based on my own experience - to measure the location for new holes ... simply use the masking tape on the removed end cap and poke the holes through the tape - remove the tape and reapply to the newly cut body, using the edge of the tape for depth and aligning the circumference location - when applying silicon sealant, apply a small bead then spray your finger with windex before running it along the bead ... along with the mask-off, this gives a pro finish!

[@MotoMirius]

Thanks for the tips!

[@paavanpanchal1067]

Never thought this could be done, amazing, but that's what engineers and mechanics do right?

[@MotoMirius]

This is a popular mod with many bikes so I’m not going to claim any credit. Playing and personalising is half the fun. Skäl. David

[@paavanpanchal1067]

@@MotoMirius not popular in my country, most people just buy a $20 fake exhaust and call it a day😂

[@MotoMirius]

Well you have a point 😆. Probably doesn’t happen much here now either. OK call it an old school approach 😅

[@martinguardia]

@@MotoMirius improve on sound and performance?

[@Chris-yy7qc]

​@@paavanpanchal1067 Youre lucky. In my country if you do either one to your bike and get caught by the cops, theyll seize the bike. :-(

[@JaimeBetanzosJ]

I did it to my 250 Duke, and I love the result, thank you for the great idea!!!, now thinking about the next mod'; from México.

[@MotoMirius]

Sounds great! Have fun with that. Skäl David

[@motoparkour]

Thx for the vid. Dd the mod yesterday. Sounds a lot better, cheap mod and a better sound. I left the dB killer in it but I shortened it. This way it sounds even deeper and still looks kind a stock from the outside

[@MotoMirius]

Sounds good and as you say, with the DB killer still in, who knows it isn't stock? Good stealth mod.

[@johnchassie-rideout4927]

Hey if you wanted you could make another small muffler out of what you cut off. If you make end plates for it. Great job explaining the process

[@MotoMirius]

That would be a very short muffler! Thanks for that! Skäl. David

[@Chris-yy7qc]

12:35 Ahhh the good old marking with your measuring calipers. Everybody tells you not to do it, but in fact everybody is doing it that way. :D

[@MotoMirius]

Yeah quite. Of course you shouldn’t do it with your good callipers. 🤣

[@Chris-yy7qc]

@@MotoMirius Works best with the good ones because the tips are still sharp. 😄

[@nagachief984]

Awesome work .I don't have a bike but I really like the duke 390 alot and someday when I get it, I'm gonna do this as soon as possible 👍🏼

[@MotoMirius]

Good luck with that!

[@meltonrobbo]

Good vids. Not even got a Duke yet, but on the short list and that shortened pipe really does smarten up the back end.

[@MotoMirius]

Thanks. I have to say that it's one of my favourite mods! Skäl David

[@Boardinfourlife]

Pretty cool watch.. not to sure how i feel about shortning the exhaust however.. everyone knows these bikes run hot and i could only imagine stop and go traffic with a slight breeze and that hot exhaust smoke is now heating your caliper rotor lines etc... and potentionallly more soot build up.. 🤔 none the less i love your videos man.. keep up the great work..

[@MotoMirius]

Thanks. If you had an exhaust that ran along the swinging arm, that might indeed be an issue, but since the KTM exhaust kicks up at an angle, it isn't even close to the caliper, rotor or brake lines, especially since heat rises. I've run shorty exhausts on this bike without any heating or soot issues.

[@Boardinfourlife]

@MotoMirius appreciate the reply as always.. it is a nicer look in my opinion for sure.. I've just finished my 2nd RC 390 rebuild complete 2017. Transmission collar bushings, 3 gears ⚙️ conrod bearing shells for crank main journal new primary cylinder head camshafts(intake/exhaust) cam cover, timing chain ⛓️ and the dreaded oem timing chain tensioner.. with only 17,000kms on it and no previous valve clearance adjustments on top of running 10w40 😒 as his service paper work implied I can only think he road the living pants off this bike with no proper cool down on top of a faulty time chain tensioner led to its demise and his reason for sale... but the craziest thing of it all was the pin for the tensioner looks exactly like the piece I pulled from the crankshaft main journal oil port.. I hope others that read this would atleast consider proper maintenance intervals, including the inspection of that tensioner to see if the pin is still intact on either SIDE.. even if no codes are flagged, gotta listen to the bike.

[@MotoMirius]

Indeed, it is the most important thing. Service intervals are there for a reason, but often overlooked and even then are just a safety net@@Boardinfourlife

[@John-hi2yi]

Great video and I love the look, seriously thinking about stubbing. Will stubbing and keeping the baffle in increase the loudness because don’t want it to loud but a small increase would be great.

[@MotoMirius]

Keep the baffle in by all means John. Makes the end cap harder to take out but no big deal. It will be louder but even with the baffle out it’s not overly loud, and you can always remove it later. Skäl. David

[@scottgraham4392]

Gloves!!! I was in a state of suspense so many times waiting for you to cut your hand

[@MotoMirius]

Thanks for your concern. I wear gloves when there is a risk of getting cut. No risks here! Skäl. David

[@RonaldOscal]

Woooooow excelente...... tengo una DUKE 250 y cada vez veo mas videos de modificación... muy bien.

[@MotoMirius]

Gracias. La mayoría debería aplicarse a los 250. Skäl David

[@Daniellobo777]

Great job ...soon gonna be doing it to my 390 as well but i will hav to need the baffle in coz i do long rides n loud exhaust is abit tiring ...can u make a video of how u make a removable baffle too ...thanks 👍

[@MotoMirius]

Thanks, hope it helps. Removable baffle is in the planning stages, but honestly baffle removal doesn’t make it loud. What makes it loud is when you decat it. At the moment I’m running decat with a stubby exhaust with baffle in (next video) and even that isn’t exactly loud. Skäl. David

[@tinks43]

A bit more BARK, always fun playing around 👍🏻

[@MotoMirius]

Aye indeed. Oddly it seems to rev faster. Much more like riding a little dirt bike. Skäl. David

[@ajbaron33]

David, thank you so much for putting this video out! Helped up tremendously to stubby our 390’s exhaust! One question, what sealant are you using at the end?

[@MotoMirius]

You are welcome. I used loctite 5980 gasket maker/sealer. But on others I've done the original seal was in good enough condition not to need doing - this one had been damaged by the previous owners attempts to shorten it. Skäl David

[@topazaditia]

Amazing work. Thank you for this. Greetings from Jakarta, Indonesia.

[@MotoMirius]

Thanks, always appreciated! Skäl David

[@Blue_3is]

Dude wow, this is awesome! Gave me great ideas through out the video! Nice job! 💪🏽🔥

[@MotoMirius]

Thanks, look forward to seeing what you do with that. Skäl. David

[@anotsheringjourney3755]

Hebbi cha Bara👍

[@khobo1251]

Great, I will do as you instructed. Thank you

[@MotoMirius]

Good luck with that. Skäl. David

[@yankeedoodle880]

Nice neat job David, well done.

[@MotoMirius]

Thanks Chris. Much appreciated. Skäl. David

[@neilvee451]

That's awesome 🤩 love this channel, I can see me doing this 🙏👌

[@MotoMirius]

Thanks. Easy to do, so go for it!

Hi David! Another great video! I've been watching your videos for a while, is a quite impressive yours skills, could you share with us what do you do for living? And obvious, feel free if you don't wanna share!!! Regards from Brazil!!!!

[@MotoMirius]

Hi Jerômino. Thanks for that it’s much appreciated. For a living I work in an office so this is a chance to do something different. Skäl. David

[@juanposada9319]

Considering options to make the bike a bit louder. The hole saw one presented here, a Coffman shorty and a Pro Race shorty. The Pro Race is basically a straight pipe. Any experience or knowledge about these two options? Are they gonna be much louder than removing the baffle from the stock? Thanks David!

[@MotoMirius]

They are going to be louder than the hole saw. Even the Pro Race isn't that loud - because the bike still has a cat and presilencer - and the presilencer does most of the sound reduction. For me the optimum sound is decat, keep the ugly presilencer and then a choice of slip on/ removed or modified baffles.

[@facuvercellotti]

Hey Dave! Greetings from Argentina. I've been whatching all your vids. Just out of curiosity: does your bike happen to have any issues with valve stem seals? I'm asking because I'm pretty sure mine does, and I get that same white smoke out of the exhaust on cold starts. It is more noticeable in my 2016 Duke but I was just wondering if yours has the same issue or its just condensation. Cheers!

[@MotoMirius]

I think with mine it’s running rich on idle. At some point in the near future I’m going to check the valve clearances just to tick that off the list. Valve seals are a possible issue on my bike but I need to do some more testing, which I intend doing shortly. Skäl. David

[@MohammadHamza]

can you tell me why was that smoke coming from your exhaust ?

[@MotoMirius]

Cold day and bike runs rich on startup with piggyback ECU

[@josepereztorres9982]

Esta muy buena esa idea amigo pero la policía no molesta por ese mofle así desde Colombia 🇨🇴 saludos tengo una ktm 390ng modelo 2018 me gustaría hacerle esas modificaciones suba un video como se desmonta el chasis trasero de la ktm 390ng para cambiar de pintura gracias

[@MotoMirius]

Gracias por eso. Si realiza la modificación del escape con cuidado, ningún policía lo sabrá. Consideraré el video de extracción posterior. Skäl David

[@chazphot]

Could you try and use some exhaust paste on the inner surface when re-assembling rather than applying after to prevent leaks? Could just be the camera but I'm surprised how bad the factory applied seal looks, gives a cheap impression.

[@MotoMirius]

Factory seal is very high quality and much better than most stock exhausts. If you get leaks then the exhaust isn't properly aligned - this is a common mistake with people new to working with exhausts.

[@chazphot]

@@MotoMirius Ahh I wasn't referring to the integrity of the factory seal, just the appearance such as the overspill at 5:15 and the fact that it really seems to stand out as grey against the black with quite a lot there. Enjoyed the video though, informative and well produced.

[@MotoMirius]

Ah that seal. Ok yes, marketing :). KTM sell a much nicer exhaust upgrade for those who care about the appearance of this part :) Providing a very basic exhaust, although to be fair, also well made, encourages people to replace.

[@chazphot]

@@MotoMirius Yes I was referring to the sealant around the riveted ends on the can itself not the band clamp. Should have made that more apparent haha.

[@Antoriik]

Maybe next, can you try to do something good with the design ? Cause stock exhaust are not looking that good than Akra or any custom exhaust :) Good video :)

[@MotoMirius]

Thank you. I am experimenting with something different in the video which I think has potential to improve the look. Skäl. David

[@iaku2227]

Does this effect the performance of the bike in any way? Thank you 🙏 Love all your videos

[@MotoMirius]

Thanks. Not especially no. Performance is improved by making a number of small steps, but you will not add significant power to the bike.

[@iaku2227]

Thank you for always replying to my questions, I really appreciate it. I am learning a lot from your videos. Do remember that you have a fan from a small country of Bhutan 🇧🇹 Prayers and wishes to you 🙏

[@TheJWC56RSA]

Thanks for sharing David! If I understand correctly, the exhaust can be cut with the baffle in?? (It may just be more difficult to pull the end cap off...?) Regards!

Sorry if I'm wrong, but I think the baffle was removed before this video. Regards!

[@MotoMirius]

Baffle was removed. But it is not necessary. If you drill out the rivets and then cut you can knock the end cap out with a wooden block. A bit fiddly but great if you want to keep the baffle in - or to cut out after. Skäl. David

[@TheJWC56RSA]

@@MotoMirius Can one drill out the rivets and knock out the end cap? (Not cutting the exhaust)

[@MotoMirius]

If you can find a way of gripping it without damage yes. It can be on tight. Worst case you can just rivet it back on. Of course if you don’t care about the baffle then, shouldn’t be too much of an issue.

[@TheJWC56RSA]

I had no luck with the hole cutter at all. I also tried a 40mm industrial cutter with the same result. Eventually I used a tig welder to burn through the baffle and just as I thought - the baffle was heavily welded with a 3 - 4mm hardened metal wall at the back.... But it all ended well. I turned a 2mm aluminium insert for the exhaust as to round off the job. Looks and sounds good!

[@KROWARIZONA]

Just removing the DB Killer do you need use ECU piggyback?

[@MotoMirius]

Typically no. But, it’s very hard to generalise. For example, if you live somewhere at high altitude your bike will already be running lean. However, fitting an Akrapovic which flows better is OK according to KTM. Skäl. David

[@diskarlometnk6450]

Can just use a bandsaw machine and go al the way through?

[@MotoMirius]

Yes If you have a way of welding aluminium back together but it can be dangerous if the wadding jams your saw blade. I have another video on shortening the exhaust to give you a different approach. This is the fastest way of removing the baffle but not the only way.

[@toine16000]

Ce serait top de faire une vidéo sur le montage du support plaque court.

[@MotoMirius]

Il utilise le support standard. Ou vouliez-vous dire autre chose? Skäl David

[@toine16000]

@@MotoMirius le support court pas celui d'origine

[@MotoMirius]

Oui, c'est vrai - kzbin.info/www/bejne/qqisgKV8l81snMU

[@rohithpankaj395]

Any performance gains? Will it harm the engine?

[@MotoMirius]

Exhaust length is critical for performance so no. If you are looking for performance you need to invest some cash into a slip on with proven gains. This shouldn’t harm the engine but as ever it depends where you are. If you have concerns, leave the baffle in. But if you want performance you need to invest in a piggyback anyway. Skäl. David

[@kellyrowan8962]

just make new holes no need to do all that marking and attempting to match it up .... great info thanks.

[@MotoMirius]

Yes, you can do that. Depends what you are going for.

[@davidgagne9770]

Hi! Which de-cat did you install? Did you experienced your engine stalling on slow rev? Thanks

[@MotoMirius]

If I recall correctly it’s a Delkavic. No stalling at low revs. I wouldn’t recommend riding at low revs for a couple of reasons. Most people find that adding a fuelling device makes that go away. Also possible if your valves haven’t been checked. Skäl. David

[@leeb8330]

Hey, do you have any suggestions on how id take the end cap off with the baffle still in the exhaust?

[@surslaughter3524]

So your sound clip, is with the cat delete, short muffled, and debaffled? Or is it with just the debaffle and short muffler? I want to do this but want to make sure the sound I’m looking for is what this is… I watched the previous debaffle video. I love the look of it. I have a 2022 Rc 390. It essential it’s the same process. Thanks.

[@MotoMirius]

You are not going to like this, but the reality is that sound clips on the internet do not accurately represent the sound in real life. The clips I've shown are to give you an idea of the difference between the two slip ons - with the rest of the system the same in both clips.

[@surslaughter3524]

@@MotoMirius why do you say this? And you mean not going to like the short muffler or the debaffle? The sound clips I’ve heard of actual slips ons don’t sound as good as the debaffled clips.

[@MotoMirius]

@@surslaughter3524 I say that if you rely on sound clips to choose between mufflers then you are likely to be surprised when you fit your choice to the bike. There are a number of processing steps involved between recording and what you listen to, all of which add some degree of distortion. With a professional recording setup and experienced engineers these obstacles can be overcome - but you aren't likely to find that on KZbin or even on manufacturer websites - in fact you will rarely find sound clips on manufacturer websites - and there is a reason for this.

[@surslaughter3524]

@@MotoMirius so with your knowledge, what would you suggest to me. Debaffle, slip on, or full exhaust with a decat if I’m looking for a good change in exhaust note but also trying to keep it reasonable on price. I found an exhaust kit from a company that seems pretty respected “Dominator”. I know you usually get what you pay for but it’s a fraction of the price of other kits and they claim no fuel remap is required. I’ve spoke to some current users of the kit as well and they all give good praise. The main brand slip ons seems way expensive for the little change in sound they give. I don’t want to spend $1000 on a $5000 bikes exhaust. I won’t be keeping it forever, I will be upgrading in a few years. So someone in my position, who doesn’t care about DB levels and lives in a state (US) that doesn’t have emissions. I thank you for taking your time to explain this to me. I appreciate you.

[@MotoMirius]

@@surslaughter3524 If it doesn't need fuel remp then it is like the Akra and not very loud. The simplest solution is to replace the Cat with a pipe - not cat and presilencer, just the cat. This is my normal setup and then I can play with baffle and slip ons - and the slip on can cheap to achieve the sound I want.

[@dheerajd.p5034]

Much waited video

[@MotoMirius]

Thanks. Hope it was good for you. Skäl. David

[@shashankhangsubba5358]

Do you think if just taking out the fibre will increase the sound of the exhaust?

[@MotoMirius]

Yes, removing the fibre will make the exhaust louder. It is something that you can experiment with. Some people will remove just at the end. There are many ways you can play with the sound once you can start taking the silencer apart, which is why it's good that KTM provided a high quality exhaust.

[@alessandrofeleppa8230]

please help me, do you think it makes sense to make this change to my rc 125? if it's worth it , should I also modifying the baffle and how ? (I'm not going to remove it to avoid problems with the police) do you think I would end up ruining the sound or the very small power at my disposal ? (Sorry for my very poor English)

[@MotoMirius]

It only makes sense if this makes sense to you. Sound is very subjective - some people like the change, others don't.

[@ravikiran3320]

Bro what is that rivet size and also if rivet are not available can we use same size screw to lock that baffle cap?

[@MotoMirius]

Measure the rivet that you have in there - what rivets you have available and how they are measure depends on whether you are metric or imperial, where you are in the world and where you are looking to buy. You could use screws but it wouldn't look as good as rivets.

[@Only1Sethy]

Hello, How loud is the bike De-baffled, vs Stubby, vs no exhaust straight out of the cat? I just removed the exhaust completely just having it come out of the cat to see what it sounds like, and I'd say it's a little bit too loud. Just curious what you'd say the different sound levels are.

[@MotoMirius]

Hi. Loud is very subjective. Premuffler and silencer removal is much too loud for most people, not a little bit too loud - you would have to live somewhere with no people and no police. After that it's just a matter of tuning the sound to what you want. I would recommend decat and put the premuffler back on, then go from there. Stubby with debaffle will be borderline too loud - because it will be a straight through system with no baffles, OK for low rev though town and very loud on acceleration. Stubby with baffle is similar to/ slightly louder than stock debaffle.

[@Only1Sethy]

@@MotoMirius I'll have to watch more of your videos. Is there a noticeable power increase with decat? I have the booster plug installed on my bike, is that adequate for not leaning the bike out for a decat?

[@MotoMirius]

@@Only1Sethy There isn't really anything that on its own will give a noticeable power increase. What dyno tests have shown is that removing the premuffler will reduce mid range power - with the stock ECU. If you were to do it with a dyno and get a custom tune on a piggyback you might get more power. Boosterplug is designed to smooth out low rev running, it isn't designed for or capable of dealing with any major modifications.

[@Only1Sethy]

@@MotoMirius oh okay. I'm thinking about just drilling the muffler and calling that good for now!

[@MotoMirius]

@@Only1Sethy It's a good starting point. Experiment a bit, see what it's like if you only take the slip on off, see what it sounds like if you debaffle. With a bit of patience you can pick up a stock muffler for cheap. Good luck, see what sound you like.

[@MadCatLio]

does it improve performance? (top speed, pickup)

[@MotoMirius]

Yes and no. No single change will make a noticeable change, but it will form a part of improved performance

[@patthestartheoneandonly7711]

If I do that in Austria and the police catch me with that I would have to pay a shit load of money... But good work...

[@MotoMirius]

Thanks Patrick. Yes, there are places you can get away with this sort of mod and places that you just can't! Skäl David

[@josecarlosalvespereirajuni4744]

Good Man. Um from Brasil 👏🏾👍🏾

[@KROWARIZONA]

jose Carlos Alves Pereira Junior I’m from Brazil too but leaving in Arizona. Os vídeos são muito bons e eu já fiz o mesmo na minha Duke390 e postei o vídeo no meu canal :)

[@josecarlosalvespereirajuni4744]

@@KROWARIZONA Oi tudo bem, também gosto do vídeo, não tenho um canal mas sou um fã da KTM

[@Night.fury.390]

What happens if i just remove the fiber thiggy inside and keep it the same length?(i just want it to look stock and sound loud)

[@MotoMirius]

It will be loud, but I wouldn't guarantee in a good way. I prefer the shorter version for being louder and most will not realise it is shorter.

[@Night.fury.390]

@@MotoMirius aight thanks ❤️❤️❤️

[@springy-2112]

Baffle in saves on Mr plod moments but so many bikes are stupid loud anyway do probably not an issue..My mot guy says testers can't use a decibel meter the reg is does it sound stock and without two identical bikes one stock and one modded there's no way of knowing so they make a judgement normally ignoring the volume.. but...police can use decibel meters and do if they feel inclined ...👍🏻☮❤

[@MotoMirius]

Indeed. But it’s more the DVLA inspectors at the roadside. However even with stubby and no baffle you’d be hard pushed to be too loud with this bike. Decat and that’s a whole different game as there is a chunky presilencer tucked in front of the rear shock. Not that you have the issue at the moment 😂. Skäl. David

[@atsonaga5520]

Good ol hand saw😅 Sounds little better too

[@MotoMirius]

Time and a place for everything 😅. It’s a nice upgrade for almost nothing. Skäl. David

[@KROWARIZONA]

If I keep with the DeCat and remove the stock exhaust, can I ride normally?

[@MotoMirius]

Not sure I understand the question. You have a decat? Skäl. David

[@KROWARIZONA]

Moto Mirius I’m sorry. I was not clear. What I mean is if you don’t do the cat eliminator and remove just the can (exhaust), is it ok to ride without piggyback ECU?

[@MotoMirius]

If you remove the slip on I would recommend using a basic piggyback like RB Easy or Boosterplug. Skäl. David

[@yesno7378]

Hello, is there anywhere I can buy a stock exhaust to do this on as I want to do it but I’m afraid that I will mess it up and won’t have a good exhaust anymore?

[@MotoMirius]

eBay. There is a reason you see two exhausts in this picture. I have the stock and I have a modified version. Actually I have more than one modified versions...

[@topazaditia]

One question, does it affect the performance?

[@MotoMirius]

Shortening will impact the sound, I would expect little impact on performance. However in the coming weeks I propose to do some tests on this - but my experience is that on the 390 there is not much change.

[@topazaditia]

@@MotoMirius Been watching this vid back and forth. So far, I think this is the best way to achieve the louder sound without spending unnecessary cost. All I need is to be heard in the traffic for my own safety. Once again, thank you David.

[@Untal_FarWarYT]

soy de espala y me has salvado la vida jajaja gracias

[@MotoMirius]

gran cosa, gracias

[@weexplore9999]

great work dear

[@MotoMirius]

Thanks. Much appreciated. Skäl. David

[@coomb3r697]

I was just wondering what rear tyre size you have as yours looks bigger than mine

[@MotoMirius]

Rear tyre is 150/60. Skäl. David.

[@ammankhan8391]

Pls cut the DB KILLER IN BS6 KTM BIKE i am waiting your video

[@MotoMirius]

What are you waiting for? It's the same. I'm never going to cut a BS6 because they don't sell them here. Skäl David

[@ammankhan8391]

@@MotoMirius thank u so much 👍

[@davekendrick7231]

Hey David, will this exhaust pass an MOT

[@MotoMirius]

Depends on the tester but rare to fail. It’s not that loud compared to a lot of Harleys that pass. You might get an advisory. A decat with this is a different ball game. Skäl. David

[@michaelcooper10]

Did it really get a little louder

[@MotoMirius]

Of course, it's got less chance to silence - shorter exhausts with the same construction will always be louder. it's not going to be LOUD because you've got a cat and presilencer in front of it.

[@Khmersupra]

if the exhaust gasket leaks a smidge i can feel some air close by is the gasket done for or can i just readjust it back

[@MotoMirius]

It could be either, drop the slip on back off and check the surface of the gasket, if it's OK then you are good and just need to align it properly when refitting, if there is damage then get a new one, but the old one will be fine for now, though you may still find that it will seal when refitted. Fitting exhausts properly is always a matter of experience.

[@Khmersupra]

@@MotoMirius thank you i did try that earlier it worked guess was a little off thank you and ride safe

[@kal1385]

It doesn't have baffle rt? Stubby exhaust

[@MotoMirius]

It can have a baffle or not have a baffle just like the stock exhaust. You can modify the baffle, just like the stock exhaust. You can also make it removable, just like the stock exhaust. Just like the stock exhaust you can also alter the sound levels by swapping the cat and/ or presilencer with different pipes to vary the level of sound reduction.

[@dominic9279]

What was the decibel reading

[@MotoMirius]

I don't record the decibel reading. It isn't any louder than the road legal Akrapovic slip on that KTM sells for the bike. I don't record the level because people get hung up over it when in reality how loud an exhaust is has very little to do with the quality of the sound that an exhaust makes. Skäl David

[@dominic9279]

@@MotoMirius Yeah well it would be nice to know what the db is so people can be assured that their not breaking the db limit in their area, don't you think.

[@MotoMirius]

@@dominic9279 Not going to happen. That would make me potentially liable if someone were stopped by the police who found that bike had a different decibel level to what I recorded.

[@dominic9279]

@@MotoMirius well you just giving an idea of what the db is definitely wont make you liable mate you're just a KZbinr with your own ideas.

[@MotoMirius]

You asked "it would be nice to know what the db is so people can be assured that their not breaking the db limit in their area, don't you think." That is exactly why I don't do it - a bit different from my opinion to give some idea - don't you think?

[@MrJahlado]

excellent

[@MotoMirius]

Thank you. Skäl. David

[@eliseovazquez6546]

Muy bueno y prolijo m gusto mucho

[@MotoMirius]

Gracias, de nada. Skäl David

[@fredstah714]

Wow!

[@MotoMirius]

👍

[@adityagowda2146]

Greetings sir, can you inform me as to where the cat converter is located on a duke 390 or a 125 ?

[@MotoMirius]

On a gen 2 Duke the exhaust is made of the header pipe which connects to the engine then the cat which sits by your left knee leg when riding the into the presilencer by the rear shock then out to the rear silencer. Cat deletes normally remove both cat and presilencer. Skäl. David

[@adityagowda2146]

@@MotoMirius Sir, my main concern is, by removing the stock exhaust and the bend pipe that is attached to it and installing an aftermarket exhaust with an aftermarket bend pipe, will there be any unwanted consequences ? I do not wish for the catletic converter to be disturbed or removed and judging from your explanation, it won't be involved at all in what I want to do right ?

[@MotoMirius]

If you are just removing the rear silencer and not the presilencer then no, you will not remove the cat. If that is all you do then there should not be any consequences. If your new silencer is very free flowing then you may benefit from an aftermarket fuelling device to avoid the bike running lean. Normally it’s ok. Skäl. David

[@adityagowda2146]

@@MotoMirius Thank you for your time, sure did provide a lot of useful insight. Bless you, sir.

[@MotoMirius]

You are welcome and thank you. There is a video on the cat replacement if you wish to confirm your thoughts. kzbin.info/www/bejne/gKmbXpuei5eDapo

[@clicksandviews5214]

Why is the white smoke coming up ??

[@MotoMirius]

White is water - normal in cold and damp conditions where water will condense in the exhaust as a hot exhaust cools down - then burns away as the hot exhaust gas hits it. If you live somewhere hot, you may never see this.

[@clicksandviews5214]

@@MotoMirius Thanks for the info🙏

[@j-eazy2878]

Nice

[@MotoMirius]

Thanks. Reminds me that I need to refit this and see how it sounds and works with my current setup.

[@bruterohan.390]

Why your bike throwing blue smoke

[@MotoMirius]

Valve stem seals need changing - it drains down when the bike is sitting and clears once the bike is started.

[@LuisAlbertoRib]

👏👏👏👏

[@MotoMirius]

Thanks

[@ravikiran3320]

Bro what is that sealer name?

[@MotoMirius]

Various brands - high temp rtv gasket maker. Wouldn't use it closer to the engine but it's OK for the slip on in my experience.

[@patrickdylan5923]

hey david, could you make video about how to install hazard on the ktm duke. thank you

[@MotoMirius]

Hi Patrick. I will give it some thought. Bit surprised it doesn’t have it. Skäl. David

[@mittu8914]

can i buy this off you Please.

[@MotoMirius]

It will probably be up for sale at some point. Skäl. David

[@mal10dawnga]

who here because of Coronavirus

[@MotoMirius]

I'm here because of the Coronas

[@tomg6284]

What you should avoid is the glass getting into you lungs.

[@MotoMirius]

Particles of all sorts need to be avoided whether you are sanding wood, sitting by a fire or any other similar situation.

[@Silver_Surfer_1]

Oh good lord, why must you insist on using the originel holes and rivets and not just ues smoothed off self tapping screws? Think outside the box like a machinist and keep it simple. The KISS principle.

[@MotoMirius]

KISS means using rivets - almost nobody watching this is going to have machinist skills, but everybody can manage rivets. And it keeps the stock look - which is important to many people.

[@Silver_Surfer_1]

@@MotoMirius True. I get it. Although It may also be difficult for some to get the holes to line up. That's why I mentioned self tapping screws. Smoothed off with a dremel or grinder of some sort. Oh BTW, good job on the vid! 👍

[@MotoMirius]

@@Silver_Surfer_1 You aren't the first to suggest screws and if you want a proper custom look then I think your suggestion is a great way to go - the rivets are ugly even if they are so widely used for this!

[@naimargmnaimargm3543]

Nz. Bro

[@MotoMirius]

Skäl David

[@sirrobin001]

In Germany we say 'Pfusch' to jobs like this.

[@MotoMirius]

Very German of you.

[@dimos5422]

well to be honest these engines never sounded good to me none of the small dukes i had a slip on mine it really sounded bad unpleasantly loud and really bad tone (obviously because its a small engine) so i put on my original exhaust and to be honest to me it sounds better.

[@MotoMirius]

Exhaust sound is a really personal thing. I very much agree that getting the sound and tone right is very important. I like where I am now because it now sounds like a small single when blipped and quiet when otherwise riding. Skäl. David

[@bossgamer123tv7]

This can't be legal.

[@MotoMirius]

It depends what country you live in. Some yes, some no. And in the case of some countries such as the US what state you live in. Skäl. David

[@bossgamer123tv7]

@@MotoMirius I live in germany. Over here it's definitely illegal. But what about your country?

[@bossgamer123tv7]

@@MotoMirius your language sounds like you're from England.

[@MotoMirius]

Oh yes. I have no doubt that if I rode any of my bikes across Germany then they would likely be impounded. In the UK we don’t have the same legal interpretation of the Euro legislation - as you are surely aware the EU laws are adopted locally in each country with slightly different wordings. I’m considering a new video I can refer people to when this question comes up.