How to Strip down a Bosch GEN 4 E-bike Motor

[@pistolpete938]

Iv got a hibike with this motor in, I can see now why these things are so expensive, I'm not sure id risk taking one to bits myself but its still interesting to see it done properly. Excellent video keep them coming!.

[@TheYorkshireBikeMechanic]

Thank you

[@jackdrummond5472]

Great video Dave! Definitely puts me off wanting to ever have to work on this motor but really helpful for me to understand a bit more about what’s inside the motors and what does what!

[@TheYorkshireBikeMechanic]

Hi Jack, that was the main reason for doing the video, for the curious ones. thanks for watching and your comment

[@pedrojesusgilgarcia5410]

Hello, what is the outside diameter of the tool you use to place the transmission gear? Thank you

[@richardkaz2336]

It's good to see that the Gen4 motor does not have plastic gears like the earlier motors. Have Bosch improved the crank seals or are just a prone to water ingress?

[@TheYorkshireBikeMechanic]

Hi, thanks for watching, they have improved but there is still away to go. Im not sure what the answer is but I cant help thinking that cars don.t suffer the same issues where the driveshafts come out of the gearbox??

[@rusty2222]

God bless you Dave, this is so helpful, you're a star pal.

[@TheYorkshireBikeMechanic]

Thank you

[@leoguzynski]

You've completely convinced me. I'll keep my pricker out of there.

[@TheYorkshireBikeMechanic]

Hi and thanks for watching, wise choice

[@mattletch6704]

Excellent video, many thanks.

[@gusmitchell4068]

Fair play, i am never ever going to try and even touch a bolt on my cx, that thing is pandora's box

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments

[@thurgogopro5338]

At 4.48 you said remember this circlip, i dont recall seing it come off in fact you told us to leave the 2 shaft circlips on earlier, im confused

[@TheYorkshireBikeMechanic]

Hi, sorry for the confusion, originally there was one circlip on the shaft, I removed it earlier, I put it back on and another one on top.

[@jeffreybail353]

great vid, well done!!

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments

[@latonbuzzard2386]

Question: How much is it to replace the motor? I'm thinking what is the cost of any such repairs parts and labour and is it worth repairing as other parts will deteriorate later on down the line. My motor has done 4k miles.

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching, it depends on which model the motor is.

[@latonbuzzard2386]

@@TheYorkshireBikeMechanic hi, I have a Bosch performance line CX

[@giuseppeurbanotortorici2314]

Hi, I'm an engineering student. I need to choose the motor for the bike I designed, do you know the gear rate of the bosch motor?

[@TheYorkshireBikeMechanic]

Hi, thanks for watching. The gear ratios can be changed for most combinations but this is a plug in to program the motor via software. the problem is that only motor distributors have the administration level to enable this change. As partners/service agents we dont have that level of access.

[@RichardOldfield-pm2zm]

Where can i buy a torque sensor from thanks uk?

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments, they are not an available part unless you can find a used one

[@jonnypaget]

There’s a particular shop that sells these particular sensors

[@michaelhodge9902]

How come it has a hairpin stator unlike other motor stator.

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comment, I'm not sure why

[@mboocock77]

Hi there pal,,I recently started hearing and feeling a grinding coming from what feels is the motor,,I don't know if you have heard of this it's a Lapierre overvolt am 5.6...any help or advice is appriciated pal

[@TheYorkshireBikeMechanic]

Hi, you need to get it into your bosch dealer

[@mboocock77]

@@TheYorkshireBikeMechanic I don't have one I bought it 2nd hand,it's more or less brand new, I rung the dealer where the person bought it from and they said warranty is void if sold...so Im kinda stuck then..where in Yorkshire are you I might have to acquire your services

[@TheYorkshireBikeMechanic]

@@mboocock77 Hi, do you have the original receipt for the bike.

[@mboocock77]

@@TheYorkshireBikeMechanic thankyou for your reply sir. No he told me he ordered it online the only thing he showed me was a email showing that he ordered the bike. I still have his details but he said he never had a receipt...whats your opinion with the grinding feel/sound? Is it bad news?

[@TheYorkshireBikeMechanic]

@@mboocock77 I would need your bike in the workshop so I can look and listen to it to tell you what’s wrong, we are in Sowerby bridge, HX6 2BL do you want to book it in?

[@slobodanfuletic9465]

Brose is much better built

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments, true

[@juhavuorinen7711]

First of all thank you for really outstanding video with a great explanation. My gen 4 motor was out of warranty and I had little play at the crank axle so I decided to replace bearings by myselft after I watched this video but I must say its still quite hard job to do and it took something like 6 hours to get job done. It also required many special tools. When I was disassembling the motor I found that your motor missed one c-clip. When you remove first part of crank case you should have c-clip over the drive cog. I say this because if some one is trying to replace the bearing they must remove that to get drive cog out. Then that drive shaft also misses o-ring which is at midle of the shaft but thats not a big deal. I tried to remove magnet motor without bolts first but its nightmare so I bought threaded rod and used that as bolt. The thread is 5mm x 0,8 which is metric standard I think. Other than that my drive shaft was quite tight to remove from the last bearing so I gently tapped it out without damaging torque sensor. Those bearing from the crank case can be removed with poor mans bearing press by using nuts, sockets and threaded rod. You can press new bearing with old ones. But all in all it is quite time consuming and hard job to disassemble this motor without damage but It can be done thanks to your video.

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments, it's a very trick job and not for the faint hearted. well done.

[@wonjat5]

Just to say how much I like your videos, well done for sharing your knowledge and expertise. I think you strike a sensible balance in terms of encouraging bike owners to maintain their machines, at the same time encouraging to recognise their limitations and go to their local bike shop. The Bosch Gen 4 motor strip down was excellent. We have two e bikes Velo de Ville, I look forward to re-racing the motors when they reach that stage. Kind regards 🇦🇺

[@TheYorkshireBikeMechanic]

Hi, Thank you for watching, and thank you for your kind comments, I try to show people a more practical approach so they can decide if it's something they could do, if don't think it is I will say so, you get what you get with me, if you know what I mean. Thanks again

[@TheYorkshireBikeMechanic]

Thank you, I appreciate your comments

[@FrankBlazeNL]

Superb, very informative. Looks like changing some crank bearings has become quite a mission! Hopefully mine will last a while before this needs to happen. Great video!

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments

[@bmartinot]

Upsetting to see my expensive ebike is just a load of disposable crap at the heart of it.

[@steve9502]

Great to see you back and well and doing videos!! I have at least one month left of good riding before the bike goes away for the winter. Any tips for storing your Emtb for a long period of time? Thx Steve

[@TheYorkshireBikeMechanic]

Hi Steve, the best thing to do is bring your battery inside and charge it to approx 50%, if it's a bosch battery and you know your dealer well ask them to prepare it for storage, we have a bosch battery conditioner that prepares them for storage.

[@mallebimbango5132]

Hey Man. Your video is very helpful for me. My Error code is 510 and mean error of torque sensor. In a forum I read about replacing the sensor in a "correct" position..?! Any experiences from you for that? Thank you so much

[@Aycim1990]

I betterbgave watched this before fiddeling on my motor 😅 But nothing damaged and now i know better! Thanks for your really nice videos!

[@Andrea-vv1ol]

Wonderful video compliments. Why don't you make another one where you show how all the bearings are changed? It would be magnificent

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments, simply because it would be a too long video.

[@urabus_]

good day, what lubricants should be filled inside the engine (calcium or lithium) and how often should it be done

[@marcopaganotto9125]

No chance! I am absolutely servicing my own batteries and motors going forward as wtf can afford replacement batts and taking their worn out Bosch BB bearings to a service extortionist, I mean centre!

[@richardharker2775]

Very good description of how the everyday handyman will lose a lot of money trying to do things outside of their expertise. One question if I may. Would these motors benefit from some sort of regular service?

[@TheYorkshireBikeMechanic]

Hi Richard, yes leave well alone. They are virtually maintenance free apart from replacing the external the 2 protection covers on the end of the axle (on the outside)

[@givreycham]

Thanks Dave a brilliant video....makes brain surgery look easy! I can't imagine how you worked out how to do that and the pitfalls but very skilful.

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments.

[@jameslamb7085]

I honestly don't know what I would have done without this video, followed it step by step and managed to sort out the crank shaft bearings and the pcb. No error codes now and it's running like new. Are you going to do a video on the transfer gears sometime soon. Thanks 😊

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments

[@tandembike]

Thank you! Really wanted to see what a Gen4 innards looked like and how it works. Bosch is so protective of it's dealer network (not a complaint I understand why) it's impossible outside of youtube to see what's going on inside. Outside of bearings I doubt there is anything that a consumer could fix as I don't know where/how you could source circuit boards and sensors. Stay well and hope you enjoy continued success with your recovery,

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments, the only source of components are from broken or stripped down motors

[@officialmysteriousrider130]

PCB printed circuit boards

[@vampiszon6620]

Man I wish I was living in UK, would give you my new CX gen4 motor for regreasing as it's kinda loud...

[@huntjk1]

Hi there again just a quick question should the gears (cogs) inside gen 4 have grease on them if so which grease thanks again

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments. yes they should but not too much, Bosch have done away with nylon cogs in the gen 4 so the grease choices are more, my personal choice would be MOLYKOTE PG-75

[@steve9502]

Hey Dave. Quick question, I’m changing the cassette, chain and chainring on my Shimano e8000 Commencal. I want to go from 34t to 32t chainring, is there any issues I should know about. Thx Steve

[@TheYorkshireBikeMechanic]

Hi, it’s difficult to comment because the motor will have been programmed for the original chainring, it could generate an error message, only way to find out is try it

[@ivanbayarri2807]

Glad you are doing well. So my Bosch moter with the horrible rsttling noise going over rough terrain is going into warrenty hope they can solve the noise is horrible

[@TheYorkshireBikeMechanic]

Let me know how you get on.

[@tonomontero925]

It would be good to have a video on what parts of the engine to grease, how to grease and with what?

[@TheYorkshireBikeMechanic]

Hi, I have stopped overhauling motors due to their complexity

[@tonomontero925]

😢

[@tazodj]

Great and really complete video ! Can you tell me the size of the Torx Plus Bolts of the case ? Torx Plus Ipr25, Ipr20, Ipr30 .... Thanks !

[@TheYorkshireBikeMechanic]

Hi, sorry it’s been a while since I did this. I will try and look back for you

[@nickclarkuk]

Thank you for a great video ! I starting to appreciate why these things are so expensive! The technology and tolerances might put Tesla to shame .

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments

[@adrianhrusca4067]

And they are made with low weight on the mind...sadly they don't last (in general, not this Bosch gen4)...

[@Ringo300880]

Hello, glad to see you back here recovered. And then right away with this project, which has interested me since the Bosch G4 on the market. Thanks for the information. Greetings from Germany

[@TheYorkshireBikeMechanic]

Thank you, thanks for watching from Germany, one of a few places I would like to visit

[@Ringo300880]

@@TheYorkshireBikeMechanic You are welcome 😁

[@frankedoodle3798]

Hi do you know if there is a noise when the crank is moved backwards and forwards a tiny bit - It’s not a rattle, more a slight sound as you go from freewheeling to engaging the motor. If you ride along freewheeling then very slightly peddle to engage the motor, there is a slight clunk as it engages.

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your question. each brand of ebike motor has its own characteristics, some will be fairly quiet during use, others can be clunky during transition from power to overrun. they all generate different noises that are normal for that particular motor. unfortunately it's experience and diagnostics that tell us when something isn't right. if you have a good ebike mechanic let them have a listen and ride or if you have a friend with a bike with the same motor compare it with theres.

[@DaBinChe]

I'm surprise that the circuit board is just open to the guts of gears, grease, etc.

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments

[@kjeldschouten-lebbing6260]

It's incredible how many basic design flaws and cornercutting is in this thing. No wonder Bosch is so protective about it.

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments

[@giffmiff5920]

Great video Dave...but best left to the experts like you ! Have you done a video on removing the Bosch motor from the frame?

[@TheYorkshireBikeMechanic]

Hi, I don’t think I have because each manufactures differ

[@NottherealRobWarner]

You say Bosch are great, I had a motor replaced under bike 2 year warranty, the motor is only 14 months old and gone again now seems like bearings, is the new motor still under a 2 year warranty? Thanks

[@TheYorkshireBikeMechanic]

Thanks for sharing

[@sijmes]

Great vid, do you think at some point that Bosch may make new or maybe reconditioned motors available ? Ive seen other people selling them online, salvaged from damaged bikes or so they claim.

[@TheYorkshireBikeMechanic]

I don't think that they will, Each motor is programmed for the bike and gearing thats its going in. this is done by the bike manufacturer at the time of install. I dont see how they can sell them on ebay as they will be pre-programmed

[@1marcelfilms]

I had corona virus a few months ago. The headaches were the worst. I guess the virus is still out there

[@TheYorkshireBikeMechanic]

Hope your better now

[@EbikeGuadarrama]

Buen trabajo,un saludo de Paco, un compañero español

[@TheYorkshireBikeMechanic]

Thank you

[@dieseldan1]

Mine is shot with just over 2200 off road riding. About the only time it got wet was when I wash it with a garden hose once a week.

[@TheYorkshireBikeMechanic]

Sorry to hear this, thanks for watching and your comments

[@laszloszollosi5469]

Please inform me about the rotor max rpm ? Thanks advance :)

[@TheYorkshireBikeMechanic]

Hi, sorry I don't have that information.

[@andries514]

Where do you get your info from? I mean as far as i know bosch doesn't provide much.?

[@TheYorkshireBikeMechanic]

Hi thanks for watching, from personal experience, Ive only got good things to say about Bosch ebike system support

[@andries514]

@@TheYorkshireBikeMechanic Thats for sure. They do a very great job as it comes to warranty and service.

[@thomassailer581]

Perfect, perfect outstanding video!!!! Thank you very much 👌

[@TheYorkshireBikeMechanic]

You're very welcome!

[@powerbikesbg]

Thank you! Just done it thanks this tutorial! Regards from Bulgaria!

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments

[@adrianhrusca4067]

After how many kilometers youbhad to service it? Thank you!

[@powerbikesbg]

@@adrianhrusca4067 The engine with the noisie bearings was only on 700 km

[@adrianhrusca4067]

@@powerbikesbg thank you! What bike?

[@powerbikesbg]

@@adrianhrusca4067 Cube Stereo 120 2021

[@chef9744]

Bonjour, j'ai un bruit moteur sur GEN 4 quand je pédale qui fait (taque taque taque taque...)surtout sur la pédale de gauche ,est ce que c'est le roulement qui est mort? Merci.

[@TheYorkshireBikeMechanic]

Not necessarily, I would need to listen to it

[@chef9744]

@@TheYorkshireBikeMechanic Bonjour merci de me répondre voila le lien désoler pour la qualité du son (kzbin.info/www/bejne/a4uppYiLhbKAhaM ) Si c'est le roulement gauche c'est quoi la référence svp. Mon magasin ma dit qu'il faut 8 a 9 mois pour passer la garantie donc je vais le faire moi même et merci pour votre travaille .

[@zbiks]

Hi, I would apritiate some advice. I replaced all bearings in the gearbox, but the last one, middle on the rotor, is a pure nightmare. What is the order to put it apart? First I need to pull this silverish little ring mounted on the roto shaft? Then press out the noise bearing from the aluminium case? This order seem to be most feasible, but I don't have experience with the rotor.... Cheers, Mateusz

[@TheYorkshireBikeMechanic]

Hi, please can you give me a time stamp of the part you are talking about

[@zbiks]

@@TheYorkshireBikeMechanic Hi, the part I ask is not in your movie :) You only say that bearing of my interest requires some heat treatment. It is visible, as well as the plastic ring, when you open the gearbox completely. I can send you an email, if possible.

[@richardkaz2336]

That torque sensor cable. If the solder has broken but the circuitboard tracks are in tact and all surtface mount components are intact then you should be able to load up some surface mount flux to the circuit board and and cable connector and using a fine nozzle air heat solder gun to refloat the connections. Worth a try. It is surprising that Bosch did not apply some epoxy or adhesive to better support the connection.

[@TheYorkshireBikeMechanic]

The torque sensor unit is quite sturdy and will stay in tact providing that the unit is dismantled in the right order, compared to the sensor on the shimano e8000

[@davedavies8002]

Any idea where I could find new circuit boards? My motor was soaked and had water inside, slight corrosion in places.. I've cleaned them with contact spray but I'm not convinced id rather replace them now the motors apart instead of rebuilding and stripping again

[@niccots]

The circuit board is just like that with wearing material and lubricants?

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments, yes

[@yali1408]

Hi. I’m stuck now. Did everything and putting it back together and now there’s a tool I need to make to get the drive bearing on! How do I make this tool. What do I need? What’s everyone else done ?

[@juhavuorinen7711]

4 month ago I did replace those outer casing bearings and now I might have a problem with drive gear one way clutch bearing. Have you removed that bearing from that cogwheel? In video you say it can be done by pressing but is there any lock ring or anything that must be taken off before you press? Obviously you need to develop some kind of tools to press that bearing out without damaging the cogwheel.

[@VovanCBR]

thank you, it would be interesting to see latest version of this motor with wireless speed-sensor (latest generation from smart system with RIM magnet version). and compare to wire speed sensor version.

[@TheYorkshireBikeMechanic]

Hi, yes it would, they are still very new and so I cant get hold of one, I would expect the internals to be nearly identical, its the electronics thats would be different.

[@VovanCBR]

@@TheYorkshireBikeMechanic why would they need so many identical motors, why not to stick to one model, if you introduce a new one, make at least some torque or speed improvement

[@rafaelmerino5372]

Dear colleague, thank you very much in advance for the great work you have done for the entire community. I wanted to ask if you know what type of grease this Bosch G4 motor with metal metal gears uses..

[@TheYorkshireBikeMechanic]

Hi, there seems to be conflicting info on which grease to use at the moment, I am working on it

[@mmaaddict78]

I would guess a moly grease. Because moly grease doesn’t squish out from between gear teeth.

[@Bikeaddict4235]

Note to self , never ever try and dismantle one of these 😂 Another good vid dave thanks

[@TheYorkshireBikeMechanic]

Thanks 👍,

[@NerdTouchingGrass]

it seems like it would be SOOO much easier just to separate the electronics in a small little package.

[@TheYorkshireBikeMechanic]

Hi, Thank you for watching and your comment

[@MathiasMatzat]

What a difference to my Gen 2 motor I opened recently to put fresh grease to the gears. I don't know I would dare to open the Gen 4 motor of my new GravelBike some days in the future.

[@ChristianJohnsons]

Excellent tear down! Thank you for doing this!

[@xmateinc]

Be nice when bosch makes these bearing kits easier to replace. Im gonna use mine for a long distance tour, and hope the bearings last.

[@pygmalionize]

thanks for the videos, much respect from a friend in Morocco

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments

[@logo600se83]

Did he anyting said other than „ok“ 😆😆😆😆

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments, yes I did " toodlepip"

[@Wimbelder]

Way take it apart just sent it back to Bosch if somting is wrong

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments. We dont, strait back to bosch or bin

[@huntjk1]

Great video could you tell me dimensions for Sleeve thanks

[@TheYorkshireBikeMechanic]

Hi, yes sure, 32mm outer, 19mm inner, slight taper on the top to ease the bearing over the sleeve

[@huntjk1]

@@TheYorkshireBikeMechanic thank you mate

[@yavorapostolov2979]

@@TheYorkshireBikeMechanic Hi mate, did you mean 32mm outer and 19mm inner? Whats the lenght of this special sleeve? Greatings from Austria!

[@DJDOG-zakkgamer6423]

Why don’t you chop the heads off the long / locating bolts ? For locating the magnetic part. Then it won’t be as awkward holding it with one hand and screwing the bolts in / out when assembling / disassembling , just a thought 👍

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comment. great point, thank you

[@xfrolx5289]

ты КРУТОЙ

[@stephenbrown5844]

Hi dave, pleased your OK and slowly getting over your covid🤬🤬hate the dam virus🫠Thank you so much for your info on my bosch gen4,,, I think when it's needed I'll give you the job bro😁👍excellent info yet again 😝❤️🇬🇧🇬🇧👌stay well 💚💚

[@TheYorkshireBikeMechanic]

Thanks Stephen

[@lexpee]

it becom beter but the first generation was bad en quickly broken. years a go i have an bike with an bosch mid frame motor. after 2 years 2000 km the motor was completely worn out. the warranty has expired and I had to pay €1100 for an replacement. 2017 I bought an conversion package with a 36v 250w front wheel motor, I have been driving it since then, now I have driven more than 6000 km with it.

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments.

[@giovanni1717]

Hi! My motor has stopped clicking when backpedaling. Everything works but backpedaling will bring the chain backwards like a non emtb. Should i be worried? Could it just be the spring for the ratchet that is stuck? It will click if i force it while holding the chainring still, and also when i stop pedaling and it overbosts.

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching, This is not normal, you need to get your motor checked as soon as possible

[@vladtepes4346]

particular counter: 96

[@vincenzomustica2045]

hi, I have a problem with a Cube e-bike with Bosch GEN 4 engine, turning on the bike from the display everything works perfectly, but the engine doesn't turn, what could have happened? thanks for your help

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comment, sorry for the late reply, its more likely to have seized on the drive side bearing but I couldn't be sure without looking

[@rg8707]

Looking forward to work on one of these motors after this video. But now I just finished a Brose motor and my question is should i put grease on the planetary gears? I read to use a Molykote PG-75. I don’t see any body using it or if so how much. What do you think , all these motors have gears being plastic on plastic or plastic on metal.

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comment, the reason you dont come across pg-75 is because its so expensive, its good stuff though. Bosch make some really nice grease for nylon, its called Bosch gear grease, they also make bearing grease, really tacky, great stuff

[@crashedagain]

Very informative video but getting Bosch parts is very difficult. I have tried to get a bearing kit from tow Orbea dealers to no avail. They don't seem to be getting a response from Bosch about a bearing and seal kit and a torque sensor which I broke when a tool fell off the shelf above my bench. I now have a bike that has been down for a month and I am very frustrated especially since the bike has less than 50 hours and has been well cared for. Any recommendations on how to get parts for the Gen 4 motor?

[@TheYorkshireBikeMechanic]

Hi thanks for watching, there are no official parts available for any Bosch motor, only option is try performance line bearings he could have some used parts available

[@streamg]

How much would you charge to change all the bearings on gen4? In my country they want 500€ but that seems too much cause new motor is 699€. Tnx

[@TheYorkshireBikeMechanic]

Hi, Thanks for watching and your comments, its not a service we provide

[@carstenreeder8634]

Hi Thank you for your excellent videos. Well explained and in a likeable way. I have a gen4 motor with an yet unidentified electrical internal failure. Code 550 was shown and my shop guessed it has a damage on the board from water that got inside. Now my question. I could get a motor wich is all fine but two pins of the display plug in are broken off. Do you think it might be possible to change out the connector sections between the two boards? To make the otherwise good motor be useable again with the connector section of my old motor. I am confident to be able to disassemble them like in your video and should be able to solder stuff in and out the board. But I have no idea if the section with the connector plug ins is just soldered on or for waterproofness is somehow glued too. I am german and hope this is explained in an understandable way. Kind regards, Carsten.

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments, unfortunately the connector pins are so incredibly difficult to replace or straighten, it's like micro circuitry and there are no spare parts available, if it's a last resort then it might be worth a try.

[@asteen75]

great job with the dissasembly! In my opinion, this bicycle motor is over engineered... not very service friendly. The price of a mechanic doing this kind of work, will leave only one reasonable solution; to buy a new one.

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments, sometimes it's a better option.

[@su1raM]

Could you please share inner and outter diameters in mm of drive cog installation tool? That I can make it/buy or cut before dissasembling the engine. Thanks

[@TheYorkshireBikeMechanic]

Hi, sorry but I have given the tool to a customer, I only made one and unsure of the dimensions to be sure.

[@TheOffroader7458]

Looks pretty simple to be honest, being a motor technician repairing semi automatic transmissions and modern engines. Good video by the way

[@TheYorkshireBikeMechanic]

Thank you

[@gazmaccmilk]

I am a lego technician. Surely fixing transmissions and stuff should be just as easy

[@TheOffroader7458]

@G Mac l take it your still a child?

[@xmateinc]

Ive had bosch warranty out a gen 2 motor a year and a half out of warranty.

[@philiptuffs-wh7jp]

Do any of of the bosch motors have hall sensors .

[@TheYorkshireBikeMechanic]

They may have one set in the motor

[@vincenzomustica2045]

Good morning excellent video it is the only one that exists on the net of this 4th generation engine, the problem with my engine is that I have to extract the one-way bearing from the sprocket, can you tell me the procedure for extracting the one-way bearing? Thank you

[@TheYorkshireBikeMechanic]

Hi, thank you for watching and your comments. sorry but it would take me ages to write it all down, sorry

[@tonomontero925]

Could you tell me what the tightening torque of the screws is when closing the engine?

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments, there is no set torque available

[@tonomontero925]

Oh. a shame. no more or less. 6nw??

[@Simon-fr4ts]

You remind me of Brian Glover, in a good way.

[@TheYorkshireBikeMechanic]

Hi, I like that, he was best in the film Kez Brillient film

[@alfabethev2.074]

Well.. you've just convinced me, to, never ever try to disassembly my cx-motor!🥶 Tnx. 4 da vid. 👍🏻

[@TheYorkshireBikeMechanic]

Glad you decided against it, nightmare

[@jamiebarkingspider5419]

Hello sir ,could you tell me is that a 90mm U.S pro puller

[@TheYorkshireBikeMechanic]

Can can you give the the video minute of the part you are looking at

[@jamiebarkingspider5419]

@@TheYorkshireBikeMechanic 29.16 brother

[@thomasclement2912]

Hello, great video, thanks!! Where did you get the tool to put the freewheel back in? bought or made by yourself? Cheers Tom

[@TheYorkshireBikeMechanic]

Hi Tom, thanks for watching and your comment, I made it on the lathe

[@totoxahc]

Is it really a torque sensor? How could it measure torque without anything being attached to the shaft? I though there would be a strain gauge. Also I know that motor controllers can estimate torque without any sensor on the motor itself

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments, complicated electronics, magnets

[@Anciabl]

I thought all along that gen4 had a belt in it :D

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments, many people thought that, the brose motor does

[@dankhalifa6937]

Hello what can be the problem when im spining pedals they spining inside the motor but the chain barley moving, i can send you video if possible

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comments, yes please send a video, [e-mail]

[@cannonballebikesltd9660]

Excellent informative video thanks for putting together. Quick question I currently have 3 gen 4 motors that are out of warranty with error code 500. Have you had any experience with this and a possible fix ? I’m a certified bosch tech myself however can’t get any help from Bosch on this other than they it’s moisture ingestion. Thanks Colin

[@TheYorkshireBikeMechanic]

Hi Colin Thanks for watching and your comments. Its a tricky position your in with these motors, Im surprised at Bosches refusal to help out, but I don't know how much out of warranty they are out by. 500 errors are nearly impossible to sort out if they return after a reset. the only way to sort them is a bosch replacement under warranty or a new motor paid.

[@edwinalfredoconchacastro9128]

Hello friend, I need the tool to install the gear with internal bearing. Is it the manufacturer or is it sold by the Bosch brand?😅😊

[@TheYorkshireBikeMechanic]

Hi, thanks for watching and your comment, home made

[@tomasz7299]

Man you talk an awful lot 🤯 You would show better which bearings to replace most often, give their numbers, show what grease to use to put the engine together

[@thurgogopro5338]

So where the splined shaft goes through the motor casing am i right in saying there is no oil seal to round shaft seal (like a petrol engine crank) due to the splines, if so no wonder they fail

[@TheYorkshireBikeMechanic]

Just a simple rubber oring

[@CushtyHealthFoods]

What’s the diameter of the piece of tube you used to put the one way bearing back on oh yeah what size are them bolts to bring up the main motor carefully and straight.

[@TheYorkshireBikeMechanic]

I will dig it out and check for you

[@simonelanciarini6281]

Complimenti!!! Molto professionale!!! Sarebbe bello un altro video dove descrive la sostituzione dei cuscinetti e la lubrificazione degli ingranaggi. Attendo con pazienza.. Grazie, Simone

[@TheYorkshireBikeMechanic]

Thanks for watching and your comments

[@alasdairhill5166]

Thank you so much,I have rebuilt and replaced every bearing on a gen 2 with no probs due to your kind help and have got a friend with bearings gone on a gen 4. 👍

[@TheYorkshireBikeMechanic]

Thats great you did then gen 2, be careful if you decide to do the gen4, check that it cant be done under warranty first.

[@alasdairhill5166]

Thanks very much but his is nearly 3 years old ,I have taken great notice of your strip and do hope you will follow up with a strip down of the transfer box.I am a mechanical engineer come welder fabricator by trade and have press and can make tooling to strip and replace bearings .It doesn't look any harder than gen 2 so far .