Before watching this! Are these injectors bad for your BMW K75 K100 K1100?

In this video I investigate why the ever so popular EV14 injectors for the BMW K bikes cause my bike to run super rich and test it against the original as well as another set of injectors in my home made injector tester. The results very much surprised me and I still cannot really explain why the EV14s had caused my bike to continually run rich. I was very surprised to see how simply swapping over the new Bosch Injectors I've bought immediately changed the behaviour.
Please note that my opinion about these injectors is solely based on my experience and my own testing. If you have different experience with these, please share your story, I'd love to hear from you!
The new Bosch Injectors I installed: BOSCH 0 280 155 969
The specs for these is identical to that of the original injectors except for they are 4 hole.
*I am fully aware that EV14 is actually not the model of these injectors but the form factor, but since everywhere you can get them for the K bikes they refer to them as such, I use the term for those specific injectors.
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The music in this video is by Bad Snacks - A Caring Friend / Music and sounds effects are owned by and licensed through Audiio LLC and the artists they represent.

[@gkanai1400]

I have had the same experience as you with a 1986 K75C. I will contact the seller who are experts in Kbikeparts. They ran rough on the bike and I returned to the old injectors. I will try the Bosch you suggested if I need new ones. Thank you for this video.

[@volimoto]

Have you installed EV14s in an early K bike? What's your experience? I'd love to hear from you! Check out my custom subframe build from scratch for my custom BMW R80: kzbin.info/www/bejne/bmLbgap3aZ5jjJo Or you're more interested in seeing how I build a workshop motorcycle lift for my garage?: kzbin.info/www/bejne/oaiynp-ilsd5jsU

[@EE9Civic]

I fitted EV14s to my K100, in some areas it ran smoother, but in general it was worse, bad enough I had to put my old originals back in.

[@volimoto]

It’s really interesting that so many people had bad experience with these, yet they’re advertised so much and as they’re the greatest you can get for the K… thanks very much for sharing your experience!

[@harrothepilot]

Very interesting video. I recently returned my K75S to the road after a 19yr hibernation. I am at a loss to explain my experience with fueling also. The fuel tank innards were all replaced with new parts, but i was not able to compare psi of old pump to new pump as old pump was long since deceased. Pressure regulator tested at roughly spec. Initially, the bike ran extremely rich on the original injectors. I removed them and cleaned, replaced orings and reinstalled, with no appreciable difference in the richness. As you say, embarrasing. I ended up balancing/synchronizing the cylinders and putting the bike on an exhaust gas analyzer. Long story short, I ended up with the air bypass screw about 7 turns out as opposed to an original 1 3/4 turns out from the stop. The bike starts and runs normally, requiring use of the choke/fast idle lever to maintain running while dead cold, reducing to no fast idle lever over a couple of minutes or so. Fuel consumption is somewhat normal from what i remember before hibernation. One simple test is to fully warm bike and allow to idle. Should be about 1,000 - 1,050 RPM. Push starter button with engine idling ( no danger of inadvertant starter operation/damage, starter is locked out automatically on K bikes ). You should observe a very slight RPM rise, about a needle width on the tacho, as the bike thinks its in a start scenario. If you get this result, you are somewhere near where you should be for AF ratio. Why is there such a difference with the air bypass screw over 19 years? Dunno, TBH. Is it different composition of fuel? Who knows?? Im thinking of dropping $$ on a new pressure regulator, just to rule that scenario out. Nice to have the bike as i remember it though, good fun. Tks for your video.

[@volimoto]

First of all, I’m happy to hear you resurreceted the hybernated K75S! I hope it’ll bring you a lot of joy riding it! - It’s very interesting that even after doing all the cleaning it ran so rich! Have you tried cleaning the MAF sensor? (i know it’s not really a true MAF in these bikes, but for the ease if it let’s call it that). Or maybe the little door inside is moving a bit stiff? I’m glad you managed to get it run properly! I wanted to put mine on a gas analyzed but couldn’t find anyone near who had one.. there was a workshop my dad used to work for that had in the past but when I asked they said they sold it some time ago.. Let me know if the fuel pressure regulatir does the magic! And thanks for your comment!

[@dduncker5457]

When you say "air bypass screw" are you referring to the screw to adjust the co-value on the airbox right above the motor?

[@harrothepilot]

@@dduncker5457 Yep, adjusted with an Allen key. And I made certain the air flow flap was free in its movement ( very gently ).

[@joaquinrodriguez3524]

hello! first of all sorry for my google english. I installed some of these injectors on my 1992 BMW K1100 and I have also gone crazy with the consumption, black smoke is common as well as the smell of gasoline. I have gone crazy with the TPS, with the fuel regulator and finally with the throttle body. After watching your video I might buy some new injectors to check it. If I do I will post my result here! all the best!!

[@volimoto]

That’s very interesting you have the same problems! I have also looked for the probem all those places, and couldn’t explain why it’s not running well. Hope you can fix it and looking forward to hear the results! Thanks for your comment!

[@detenator890]

I have the EV14 injectors on my R1100 and they improved the power and smoothness of the engine. I installed a flex fuel kit, and that made the bike miss fire and be overall uneven running. But after new bosch platinum spark plugs and injectors, it runs very smooth now.

[@volimoto]

Really happy to hear it’s working well for you! I think it’d be the same for the K1100 as well, as both yours and that already have the more modern Motronic injection, and not the L-jetronic as the K75s and K100s. The R1100 is a nice bike👍🏻

[@zettaker2181]

What is flex fuel kit? I'm owner R1100RT 97', want replace stock injectors to smooth rough idle.

[@detenator890]

@zettaker2181 That is the same exact bike that I have. Mine is blue. 😀 The flex fuel allows you to put E85 (85% ethanol alcohol, 15% gasoline) into your tank. The injectors are kept open slightly longer to allow more fuel into the engine. I highly recommend the EV14 injectors, new Bosch spark plugs and throttle body sync to make your bike run better than new. I don't remember the part number of the spark plug but I can find it for you when I get home.

[@Chrii656]

I am confused, did you compare three sets of injectors? What is the bosch part number for the third set that tested 108?

[@komandoalicante]

Creo que la opcion de un inyector para cambiar el original (0 280 150 210) por uno que nos de mas gasolina podia ser (0 280 150 -208) el primero tiene unas caracteristicas de 135,1 cc/min y/o 97 gr/min a 2,5 Bares por la opcion que propongo 0 280 150 208 que proporciona 144 cc/min y/o 103 gr/min a 2,7 bar NOTA Bosch Creo dos inyectores con la misma referencia hemos de encontrar el que es para renault 1.4 no para BMW

[@komandoalicante]

Me encantaria poder comprar unas pinzas como las tuyas para evitar la perdida de combustible, me podrias dar una idea de donde comprar

[@golconda86]

hi, thank you for your video, really interesting. i have some question: - where did you find the fuel flow rate spec for K bike injectors? are you sure that the 116 gr spec is correct for K bike? is this value referred to 1 minute of operation? - the BOSCH code 0 280 155 969 is reffered to EV-6 injectors. The EV 14 injector 116 g/min n-heptane has this Order number 0 280 158 200. are you sure you order the correct injector? regards

[@komandoalicante]

Según creo las características del inyector Bosch 0 280 150 210 son 135,1 cc/min o bien 97.19 gr/min a una presión de trabajo de 2,5 bar y utilizando como liquido n-heptano , pero hemos de tener en cuenta que podemos hacer que trabaje nuestra LE Jetronic o nuestra motronic de forma mucho mas forzada kzbin.info/www/bejne/gaWpi2V5bcukeac

[@komandoalicante]

Por favor por que indicas como referencia los inyectores 0 280 158 200 Si no creo mal estos inyectores proporciona 170 cc/min y/o 116 gr/min a una presion de 3 Bares, si el regulador de nuestras motos trabaja a 2,5 bares estamos haciendo trabajar los inyectores con otros baremos no testeados.

[@volimoto]

Hello! To my memory I found the specs for the K bike injectors at one of the well known websites for K parts. Funnily enough, I can't find the same spec sheet right now, and 3 different places list 3 different specs... But yes, specs are given for 1 minute of operation at 100% duty cycle, which you shouldn't do in testing because you can burn the coil inside. This store advertises the replacement for the original K bike injectors with the specifications I used for my testing ( 116g/min and 166cc/min, except for impedance being different) but this is not the page I've seen before: bavarianwerke.com/product/brand-new-genuine-bosch-fuel-injectors-for-bmw-k75-motorcycle-replacement-for-bosch-0280150210-bmw-part-number-13641460450/ The BOSCH injector BOSCH 0 280 155 969 is indeed EV-6. Those are the alternative injectors I purchased to install into the bike. I think they're for a 3 series BMW, but can't remember right now. They also have 116g/min or 166cc/min as the original K injectors were specced based on what I found info at the time. I don't believe I mentioned part number for the EV14s in this video. The injectors are from KPartsHolland and I had used the part number on the side of the injectors to identify specs. These injectors are originally from a Renault/Dacia. And importantly, I used my testing setup at 3 bars for all injectors, because the specs I found were given at 3 bars, and I wanted to maintain consistency between it all.

[@zombiewoof5257]

I installed Bosch 0 280 150 987 injectors (4 holes) on my 1996 K75RT. They work great with the same fuel consumption as the original ones. Did your bike come standard with those 4-pot front brake calipers?

[@volimoto]

Thanks very much for the info! 🏍️ - Just did a quick search for them and they’re also identical specs to the original and the one I installed now. It’s great there are many variaties available. Hope you like the video👍🏻

[@zombiewoof5257]

You're welcome, did your bike come standard with those 4-pot front brake calipers?

[@volimoto]

@zombiewoof5257 No it didn’t. They’re from an R100R. Calipers, discs and master cylinder. All of those parts are straight bolt on to the K75 and early K100s. You can get the calipers from later 4V models, they’ll bolt up fine, but the disc spacing is off by 3.5mm (if I remember correctly). But if you can get the discs from an R100R (maybe R80R as well) they’ll fit. Also the master cylinder is a straight plug&play just with the two bolts into the switch/level armature. The later K1100 master cylinder are actually different size and they don’t fit onto the K75 only with some modifications. Hope this helps🏍️😎

[@tf0087]

I installed ev14 on my 16v K100 and i too have been having rich running (black smoke and smelling fuel). So my theory is the ev14 atomize (finer mist of fuel) the fuel so much better than injectors with 1 hole that it combusts easier and therefore would not need as much fuel as the injectors spray. I’m planning on buying a adjustable fuel pressure regulator and playing around with that. Less pressure less fuel right? Any comments doo i sound crazy? Or am i missing something that would not allow my plan to work?

[@volimoto]

It’s really interesting to hear even 4V bikes have the same issue! I had also thought about messing around with an adjustable fuel regulator, and I think it could work! I’d be very interested to hear the results if you do so! - my only skepticism regarding the 4 hole vs 1 hole injector atomization that the new injector I put in are also 4 hole, yet they don’t cause the rich running. I’m still theorizing the the different impedance value is the culprit, but then again, my testing showed that in fact the EV14s sprayed less than the others… So please let me know if you test the adjustable fuel pressure regulator. Maybe with less fuel you’ll manage to get a smooth running engine and even reach better fuel consupmtion? I don’t see any reason why it couldn’t work by the way! And if you can’t get one that has vacuum line to it, remember to put a blind plug into the vacuum hose that comes off of the current regulator! Cheers!

[@tf0087]

⁠​⁠​⁠@@volimotohappy to get your view on this idea so fast! Yeah it’s weird the other 4 hole injectors work fine!? I’ll buy the adjustable FPR but it will be closer to spring for testing. Have allot of building to go on my K. Good thing you mentioned the vaccume hose will remember. And i’ll write about my experiments when i get so far!! I also have original injectors if all ells fails will just rebuild them.

[@volimoto]

@tf0087 sounds great! Looking forward to hear about your results! Happy building! And Happy Holidays!

[@manuf1614]

Hello, I try EV14 on my modified air admission K100 and I confirm, it is running rich, very rich ! I use a Lambda sensor to test how much I am rich (at all rpm). I got an AFR of 10, even less than 10 !!! I try every thing to return to a better AFR but I couldn't ! ( change AFM settinf, spring, cursor position ...)

[@harpindersingh3401]

Great video I installed some generic ones n fuel leaked all over lol.

[@volimoto]

Thanks! And ouch! It’s never fun with fuel all over…😅

[@harpindersingh3401]

@@volimoto can give the link to injectors

[@volimoto]

@harpindersingh3401 I’ve get them locally from an autostore but you can find them on eBay or Autodoc. If you’re in Europe here’s an eBay link: www.ebay.com/itm/385448715833?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=R5Wcwwv3Smy&sssrc=4429486&ssuid=oPDL6EmxRpS&var=&widget_ver=artemis&media=COPY UK autodoc: m.autodoc.co.uk/bosch/1150376 Hope this helps!

[@FLDX-ck4ob]

They do deliver more fuel than the originals, and after a while of use the bikes ECU is supposed to control the fuel mix. So at first the mixture will be a little rich.

[@volimoto]

That’s true for the k1100s but K75 and early K100s don’t have O2 sensors or any feedback to correct the mixture.

[@FLDX-ck4ob]

@volimoto Dont know bout that. This was just the answer of a specialized injector shop.

[@manuf1614]

I think EV14 impedance could explain the problem. This is a very interresting track. Depending how the Le-Jetronic control injector. I am electronician and have some schematic, so I will try to understand exactly what happen.. If with jetronic injector open faster, then yes it will be rich at all rpm! (I think you control injector with arduino board, correct ? ). On your bench it would be interesting to command injector with the jetronic. I could help you to do that because I realy know how jetronic work !

[@volimoto]

Yes, I was just using a small relay with 12V power controlled by an arduino to open/close the injector. It’d be very interesting doing some experiments with the jetronic system for sure. Merry Christmas!

[@manuf1614]

( BMW K100 LT, without airbox and AFM in vertical mount with big cornet !)

[@manuf1614]

I dont know why my message desapears, .. ok So I said that I made a piggy back with an arduino every who intercept injector command and chaage the timing (I need to remove 900uS to get a nice AFR, tested with wide band lambda sensor and confirmed by spark color !)

[@manuf1614]

gmail

[@manuf1614]

e (point) fiancette

[@Bornamortezaei]

Ich hab von Power Brick EV14 bestellt aber die sehen nicht wie Ihre Injektoren aus ?! Die sind genau wie Originale Injektoren aber mit 4 Loch !!!

[@Bornamortezaei]

Es wäre sehr nett wenn Sie mir sagen können um die von Powerbrick sind oder von Bosch ??

[@volimoto]

"Hi! Das ist wirklich interessant! Ich habe die EV14s von Thom bei KPartsHolland bekommen, aber soweit ich weiß, haben sie früher dieselben Injektoren verkauft. Ich habe gehört, dass sie versucht haben, einen besseren Ersatz zu finden, also hast du vielleicht schon das Gute bekommen? Wann hast du sie gekauft?"

[@Bornamortezaei]

@@volimoto ich hab die gestern gekauft und hab ich mit Thom gesprochen, offenbar die sind Neu und auf seine Webseite hab ich Bildern vol die Injektoren gesehen . Die Sind Neu und genau wie Originale Injektoren sind aber mit 4 Loch . Thom hat gesagt ich schicke die zu Power Brick auch . Ich dachte dass die Fake sind aber die sind wirklich Neubrand und Geil 👍🏻 Danke für deine Antwort .

[@etechjd8260]

Don't be pretentious, against an army of Bmwtop engineer, I doubt you can improve performances ( without sacrifice of the durability, vibration....)stick to original parts at least on the engine side

[@volimoto]

Thanks for your comment. I think you highly misunderstood the purpose of the video.

[@joliteal1]

In 1991 there was no 4 hole injectors...