Honda CB750 DOHC - Engine Rebuild Step by Step - Ep2

Part 2 of a step by step guide to rebuilding your Honda CB750 DOHC engine
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Clutch tool
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Pt.1 rebuild video - • Honda CB750 DOHC - Eng...
Engine removal video - • How to Remove a Motorc...

[@reidstewart2833]

You have a natural ability to teach. Looking forward to seeing the next part.

[@brodyeskelsen4389]

Dude I know its been a few years, but thank you so much for these videos! I really wanted to give rebuilding an engine a shot and watching these two strip down videos gave me the confidence to give it a go. Went to a bike yard and what do you know there was a CB750 DOHC sitting there, so i picked it up for $250 and went to work! So far I have compeleted everything in video one. Engine was in rough shape, but its been a blast so far. Your tip with the shims to get the heads and clynders off was a game changer! The bottom half looks more intimidating for sure, but with the state of the engine I gotta give it a go. Gathering the tools now. Hope you get another shop soon, would love to see more! Cheers!

[@sarahwiles6334]

Hi mate, These videos are helping me out no end with the re build i,m starting. Any news on when part 3 will be coming or the carb strip down and rebuild. Cheers mate, keep up the good work

[@emmo709]

So helpful, thank you. I'm London based and have the same bike. The next video would be so great to see.

[@bengtalback7415]

Greetings from Finland. When do you think you will have time to do part 3 of the engine rebuild?

[@anthonyb6851]

Great video.I bought a stripped down cb750, with an engine in a thousand pieces.These videos beat any schematics, very appreciated!

[@jamiericottone1554]

Looking great dude! I've been interested in picking up this bike for years, so it's nice to know someone has forged the way with a top notch rebuild tutorial! Thank you for your service.

[@naturalsIV]

No worries Jamie! The bike is wicked - very easy to work and very well engineered. If I were doing it again I might have picked a smaller twin-cylinder variant to save money, but that aside it's perfect.

[@twowheelrodeo]

Motorcycle technology is more intricate than automobile equivalents. The old Honda designs are increasable machinery. Keep up the good work.

[@UnderdogOfficial_tv]

Great content. I was looking for this kind of videos, for this engine. Keep up good work and lets see this rebuild until happy finish!

[@naturalsIV]

Cheers! Progress has slowed a little but still wrenching away on it.

[@Breakfastwithray]

Great video! Hoping I don't beat you to episode 3! Good stuff 👍

[@BuffaloGrizzly]

Hey so I’m trying to do the same thing but I cannot seem to find a rebuild kit and was wondering if you guys could give me any pointers

[@naturalsIV]

As far as I'm aware there is no rebuild kit - you have to get all the parts separately. There is a set of gaskets, sets of stainless steel bolts, etc on eBay, then you're down to your Honda supplier for all the other bits.

[@oldsbuilt8740]

Nice work! Great idea welding up a simple stand for the engine! I’ll be employing your technique when I get mine out of my 79 soon.

[@andrewrippert1752]

Great video series! Love your work. I just bought a 1982 CB750C and will be rebuilding it top to bottom and front to back. Your videos are amazing inspiration. Thanks!

[@chrishartley6935]

Best videos for our bikes I have seen. Cheers to you. Thank you for taking the time to share with us all.

[@naturalsIV]

Aww, cheers man! Means a lot that you took the time to reach out. Stay safe.

[@azizanahamad1731]

It's all about knowledge rocking the engine making wild roaring sound absolutely amazing, Honda the Pioneer tone and tune smooth nice to hear

[@jasonclarke2154]

Thanks for the videos. I’m currently rebuilding a 1979 CB900 FZ engine from a box of bits for a friend. I’m struggling with a few areas, but your videos have really helped me. Really appreciate all the hard work youve put into making them.

[@richardmayle3308]

Videos are awesome!! Very detailed and excellent video shots!! Appreciate ya very helpful, keep them coming please

[@Coltzan]

Dude what an excellent video. Super well done and much appreciated.

[@fiorellogalluzzo7282]

Very nicely done and awesome job covering it clearly on video. Splitting my case was around 30 - 60 minutes I think, but getting the alternator rotor off was a RPITA. Ah the memories. Love the engine stand by the way.

[@fiorellogalluzzo7282]

@@naturalsIV It's already a fair bit of effort with the tools, workshop, headspace and just doing the work let alone producing awesome videos on top of that, I can only imagine how much additional work goes into that. The BMW is still at the planning stage, lots of looking, thinking, sketching, modelling and researching. Soon I'll be sharing some details.

[@diegohernandezfigueroa9051]

Looking forward for episode 3!

[@naturalsIV]

Cheers Diego! Should have a gearbox rebuild video up soon.

[@tfmm3439]

Been waiting for a minute for this vid !!!

[@brianmccall8538]

Great DIY vid, I can split my cases in about 30 seconds now. However I've probably done 30 now so lots of practice.

[@jennifer-schanuth]

What’s the magic trick for the lower end he’s on in video? How do you get done in 30 seconds?

[@allanbarry4149]

this is great! you're the man. thanks for all the effort and expertise! my old workspace was a storage unit! no electricity. it was challenging for sure.

[@naturalsIV]

Cheers Allan! Appreciate the kind words! I don't know how anyone manages to work on bikes with no power. Jeez. Hard enough with it!!

[@allanbarry4149]

@@naturalsIV all my aluminum castings have been sent off to get cleaned up! how is episode 3 coming along? super stoked for it.

[@michaelperkins5746]

Excellent work

[@88Frank]

I'm about half way through this so far. My clutch was the same as yours so I guess its a mistake in the manual. Also, when you used the front axle to go through the con rods, I just did that to wizz the clutch off and didn't bother making a tool to hold the sproket. Same with undoing the alternator rotor thing. Worked a treat with an impact gun! like yours

[@gummitarzan8545]

good shit, been waiting for this! Congrats on the new house!

[@gummitarzan8545]

@@naturalsIV Btw have you considered the r6 starter clutch upgrade?

[@gummitarzan8545]

@@naturalsIV kzbin.info/www/bejne/qYqthIifjamco5o same clutch on the 900 and a pretty simple procedure :-)

[@gummitarzan8545]

@@naturalsIV very welcome

[@sarahandwilliambradford3575]

Thank you for your work! very helpful!

[@touchpointpropertymanageme2889]

Thank you for taking the time to make these videos. Any idea when video 3 will be out? I'm starting that process in the next week or so

[@bruedtv]

Your videos are really helping me out with my rebuild. Thank you! I’m gunna link these videos on my rebuild videos on my channel if you don’t mind!

[@naturalsIV]

Don't mind at all! Is your CB running well with pods? I hate the look of the airbox but there are so many scare stories about people swapping to pods and regretting it.

[@bruedtv]

@@naturalsIV at first it didn’t run great. Then I played around with the jets. If I remember correctly I took the main jet( which I believe is a 120) and used it for the idle jet. Then took and drilled out another jet to 160 for the main jet. Also took the needle out and put a #4 washer I believe on it so it lets a bit more fuel through. After that it seemed to run ok. I didn’t have any problems with it

[@karlvanboxel561]

Cool i always make card board templates of the case bolt pattern and punch holes in the relevant positions for the bolts

[@karlvanboxel561]

Crikey what do u do then try plastic bags i would suggest😎

[@naturalsIV]

@@karlvanboxel561 Yeah, they seem to work best.

[@selkie20]

I just broke the gear on my primary shaft installing an oil pump. This should come in handy

[@benignobartolomebb]

Thank you for this video know going me guts to rebuild my cb900c

[@markjamesclifford2588]

Hi, just fell upon you vid, superb matey, very comprehensive 👍, I’m in the poof taking out gearbox as does not go into neutral when hot, might bore it out to 823cc whilst I’m at it. Anyway very good vids !!! Mark 😊

[@ThrillaPark]

Cheers once again. Not an easy job or sure. I have an ‘80 cb750c. I’ve often thought of an engine rebuild but would prob not take it on myself. Very cool.

[@gummitarzan8545]

@@naturalsIV time well invested imo. it is nice to know your bike!

[@stacynpauldocs5744]

Great video....where is the next episode?? I just bought a 1981 CB750SC. These videos are really informative!! Thank you.

[@ILikeCatsMoreThanILikeYou]

Fantastic video, super in depth, wondering if you're planning on doing a port/polish job on the heads, I'd love to see that!!

[@naturalsIV]

Cheers Colin, I haven't quite figured out what needs doing on the top end yet but I'll certainly be filming and uploading it. Definitely needs a full valve job 👍🏾

[@joeldevries1174]

you can also buy a cheap socket and dremel it into a clutch tool, super easy and works well! I split 3 crank cases and they totally varied on time. ~30 for two of em and the last one i got in like 5 mins -Super enjoy these videos very helpful to have a visual just wish you were 2 steps ahead as I am half a step ahead of this video! look forward to the next one!

[@naturalsIV]

Cheers Joel! I should have explained the clutch tool in more detail maybe. The tool I liked to is £5.66 at the minute. A 24mm socket in the UK is £5.99. If people have the time to wait, I know which route I would go with. That said, if you leave it too late I'm sure a socket + Dremel solution would work great 👍

[@naturalsIV]

How is your rebuild going?

[@joeldevries1174]

Yeah for sure if you have the time to wait

[@joeldevries1174]

My rebuild is going alright, I have my engine fully apart and ready to rebuild. I’m doing a lot of research now on what comes next which components need replacing etc. I’ve got 3 engines that are all apart so I’m measuring all components to see what’s in spec. My frame is off to the side tackling one thing at a time. Also big thanks for marking up that manual super helpful in conjunction with my clymer

[@naturalsIV]

@@joeldevries1174 ah nice. What parts are you replacing out of interest? I can't decide whether to upgrade starter clutch, chain tensioners and starter coils. I'm doing the Viton stem seals, stronger cam bolts and iridium plugs as they're so cheap it'd be mad not too.

[@kilogixeri]

Instant sub! Would Love to see part 3 And also other vids!

[@naturalsIV]

Thanks bud! I feel like the next video has been 3 months off for the last four years. Hopefully I find time soon.

[@clayparkley]

Great video. I've been waiting for this part 2. I didn't see the PDF link to the Honda manual in the description.

[@McSweeneyJohn]

really helpful thanks

[@naturalsIV]

Thank you! Glad it helped. Would love to see some pictures of your project when you make a start.

[@shanecunningham8414]

Oh man where was this video in september when I was spending $35 on a rotor puller and trying to decipher the honda manual! 😂 I found that you could tap the bits of overhanging cases with a wood block and hammer like in the vid and listen for the dull sound to turn slightly sharper as the gasket slowly broke free, this gave me a good indication that I was on the right track. Still probably took 2-3h though!

[@naturalsIV]

The change of sound is a good tip! Thanks for that.

[@naturalsIV]

@Review Master "American style?!" You know cafe racers originated in London? On the North Circular? Which is less than a mile from where I live?! Anyway, I'm sure we'll all mourn the valuable input you'd have brought to the channel.

[@bencemanyoki1239]

Man, this is finally an informative, great video about bike engine builds, but where is the next part?

[@safety_dirt]

really appreciate the video! my crankcase separated almost immediately without me trying to crack it lol

[@naturalsIV]

You're lucky! I hope it all goes back together as smoothly.

[@safety_dirt]

@@naturalsIV we’ll see!

[@ro5han1971]

Looking forward to the next installment …

[@lukaszM46]

any plans to make a part 3 of these? really detailed teardown video!

[@Adm7869]

Great video! Is it possible to split the cases without removing the oil pump? My pump gasket seems to be really stuck on and when I attempted to split the cases, something seems to catching, on the front stator rotor side similar to what you experienced a bit of @ 20:00. Any idea what could be the issue?

[@jarrodchappell8061]

Loving the video and the in depth content. About to start my engine rebuild over the coming weeks and looking forward to episode 3. Is this still on the cards? Thanks so much.

[@naturalsIV]

Afraid it's likely to be some time Jarrod. Unfortunately my idiot landlord is selling our flat so I have no garage space for the foreseeable future. If you follow the Haynes manual instructions an engine rebuild is pretty straightforward though. Good luck!

[@wacker2286]

Great work! Was on the way to the shed to start the process of closing the crank cases after rebuilding the bottom end. Randomly came across this Channel! New Sub from me! I’m tempted to wait for your rebuild videos and do it along side you so I don’t miss anything 🤣🤣

[@naturalsIV]

Ha ha, cheers Wacker! New videos on the way. Unfortunately being full time child care for our little one means they're taking waaaaay longer than I would have liked.

[@wacker2286]

@@naturalsIV I hear ya. Have two myself, my project has been on the go over 3 years now! I just read your bio. Im also in aviation!

[@naturalsIV]

@@wacker2286 ha ha, small world. I'm andy_a320 over on Instagram if you want to see some of my work stuff

[@wacker2286]

@@naturalsIV cool! I’m 777 with EK! Almost got the crankcases closed today while I was at home on Sby! Should get that done tomorrow.

[@naturalsIV]

@@wacker2286 ah nice. Give me a shout if you're night stopping LHR any time. I'd gladly buy you lunch at The Ace Cafe or The Bike Shed.

[@jasonlemos3829]

Awesome Video, will part 3 be coming? anyone know how to reassemble with the shift fork position? i can seem to get the two half's together again.

[@user-hn1hk6wi4y]

Is episode in the works yet? About to start working a 79 cb750. These help a lot!

[@DanielHansenTrades]

Damn no part 3 sucks. This is the only video I was able to find and all I want to know is how to get those pistons back into the engine

[@jasonspence9516]

Good day, I enjoyed your video's, step one and two removing the top end and then the bottom end. As this was done a while back already, did you ever do a third video to show the rebuild?? Please advise, I'm about to undertake step 1, remove engine. I need to replace a broken crankcase. Your video's are most helpful, thanks eh! (Jason in Canada).

[@ianrobertson5953]

Brilliant videos. When will episode 3 be coming ?

[@the_cafe_racer_project]

Awesome set of videos. I’ve been using these to help me rebuild my engine. One question though. That o-ring that you mention when you split the case. Where is it? Do you mean the o-ring that is on the noz chain feed/oil chain feed?

[@GPski]

Hi I had a lot of trouble with the shift from gear 1 to 2 with many missed shifts. Then I found that the motorcycle racer in New Zealand Vince and hyde had a new specially shaped shifting star to fix this problem. . I've put it in but am awaiting the results of personal testing that promises to fix this problem...

[@dustanburrell1571]

any chance youll be posting the rest i know its been a year but this is the most in depth teardown video on here would give anyhing to see the assembly

[@karlvanboxel561]

Hi enjoying your vids i was wondering if u were able to tell me whether the primary chain tensioner has an oil supply to a plunger to tension the slipper tensioner against the chain do u know if thats mains oil pressure or if it has a pressure reg to it im looking at modding my yamaha thank u

[@gummitarzan8545]

im pretty shure the tensioner/plunger works based on main oil pressure and not having a specific pressure regulator, if that were your question. the plunger goes from the oil pan and up to the tensioner, so im guessing its getting sucked not pushed considering its position.

[@emreerdinc417]

Hey, great video! been watching ep1 and 2 over and over so I have a clue where to start when i disassemble my engine. When is ep3 coming out? I've just removed the engine from the frame (pain in the ass) so I'm about to start any day now.

[@naturalsIV]

Hey, thanks for the message! I've taken a bit of a break from editing to look after my daughter. Really hoping I'll be able to get the gear box rebuild uploaded by the end of the year though. Stay tuned!!

[@alexxxgrant]

Where did you buy the orange plastic wedges used to separate the crank case? what are they called?

[@naturalsIV]

Available from most DIY / hardware shops in Europe. They're called packers. Normally find them near wood screws as they're used to space woodwork when working with uneven floors and the like.

[@pierregelinas9120]

Hey great video up to now but when can we expect part3..? Ty for the hard work!

[@naturalsIV]

Hey Pierre, thanks for the nice comment! Life (work, daughter, charity stuff) has totally overtaken the bike this last year. I dearly hope to get it finished soon but equally some days I feel the weight of the world a bit too heavily and just want to hide! I really want to get back on it soon but it's definitely months off sadly :-(

[@pierregelinas9120]

@@naturalsIV Man sorry to hear that ....Hope you will be good soon in all aspects of your life ... have bought a 750c 1982 with 47 000 klm and I am trying to get myself up to rebuilding that engine (white smoke and brand new sparks that go black after running 15 minutes) but lack the will do it now, need to have one guy doing this from tearing it up to rebuilding it so I could follow the lead of the Same Guy,I do not want to go from one guy to another to get this done and so I will take time to finish the Body and paintwork ... I am a retired CNC machinist and now my way around tools but have never tackled an engine rebuild before, got to make room in my garage as I have small milling (just a hobby machine and a co2 laser taking a lot of workbench space....anyhow I will be making space this coming summer by selling those 2 machines and reclaiming a big 10 feet by 36 inch of workbench .. so will have plenty of room to work with ease putting the engine in pieces ... again take care man and hope all goes well for ya !

[@alexxxgrant]

What is the tool number for the tool used to remove the bolt for the primary drive gear; you mentioned Honda made one?

[@naturalsIV]

I'm travelling at the minute so don't have it to hand. If you search online for the official Honda CB750 workshop manual it will 100% be in there.

[@88Frank]

I thought these two parts so far were EXCELLENT! So easy to follow and detailed. I'm thinking of doing it myself, the bike I've bought has low compression and lots of miles. Quick question, I'm not sure if you have actually completed the rebuild or not but how are you/did measure the clearances for the bearings and piston rings etc? It's the one bit that I'm worried about

[@naturalsIV]

Thanks Frank! I'm still at the stage of the last video. Long story but life is getting in the way of this project!! I did read all the material on bearing / piston ring tolerances and measurement. Nothing too scary in there (and lots of good YT videos covering it) so I'd say crack on. The Motorcycle MD is great for all things Honda.

[@88Frank]

@@naturalsIV yea cheers. I've actually just had a quiet 2...3....4 hours at work and the plasti dip method looks very doable actually. You've given me the confidence to crack on so thanks for that mate!

[@christopherdegarmo9826]

mine fell apart in about 45 seconds. i hit with a rubber mallet about 2 times on each side and it split right apart.

[@nicolasboatman8613]

Have you made your own manual for rebuilding yet??

[@naturalsIV]

Not yet, likely to be after I've finished the rebuild so a good way off yet unfortunately

[@Krisntom]

80 minutes separating the cases

[@SamsunNahar-hn7mb]

This.engeal.waomani.modaal.