73 Honda CB750 Custom Build Part 21 - Clutch

This week the clutch gets an inspection and the clutch cover gets installed. Along the way I hack up a special tool to get the job done.
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Keep on hackin!

[@leeburford2385]

Hey Dino, Greetings from the UK. Keep up the great work! These videos are entertaining and educational, and they are one of the highlights of my week.

[@MegaTroyhamilton]

made my tool from a 22 mm 12 point from a pawn shop, .50 cents. put clutch on my bike yesterday. still have to adjust it today. thanks for the videos!

[@will5701]

These never get old... Thanks for another video!

[@davelegarra4915]

You are my hero been working with a chopped cb 750 and u are the only one that anwered any of my questions

[@stancoleshill8925]

Oh boy, just love when you can use your brain like that. I do this many times. I have made most of the tools for my Norton. All these tools are very expensive and I know exactly what you mean when you say you love it when you can build a tool yourself instead of parting with the cash. I have even found (recently) that a 5 inch clamp makes a better valve spring compressor than a purchased valve spring compressor. The purchased item did not fit and I had to return it.

[@JGunlimited]

So satisfying to watch those boxes of parts come together =))

[@miguevilla1026]

My friend good morning you are a great mechanic and your way of explaining unique, you have the gift to teach, and cat is very beautiful. a hug, a great person with pedagogy. God bless you always 🙏💯. 🇨🇴

[@jimboudreau7644]

I had to look pedagogy up. Now I know a new word. Thank you.

[@jonhering5660]

Once again a great video....keep up the awesome work I really enjoy watching them.

[@CarlosGlatzos976]

Man you are pretty confident with the angle grinder holding that nut with bare hands. Don´t try this at home, kids. But thanks for the great tipp with the DIY tool. Cheers!

[@HackaweekTV]

Thanks for watching!

[@manbearkremer]

I did exactly the same thing, cut up an old socket and made the same tool with an angle grinder. Didn't make the other tool, just used an impact wrench instead

[@jamesdenham6739]

Awesome stuff Hackaweek.

[@rogerwebb2058]

Really glad I found your channel- so much good information. Thanks!!!

[@HackaweekTV]

Thanks for watching!

[@BasicPoke]

Thanks for the videos. FYI for others, you can check the clutch with the engine in the frame. I guess you did it because that side cover was already off.

[@fyyff52]

I hope you're well. Excellent video. I used it to confirm my clutch plates' conditions. The quality of your video production has stood the test of time 🙂. Like another fan asked, my old clutch springs measured 35 mm, I am replacing them with new OEM springs but they measure 31 mm. I know it was a long time but wondered if you recall the spring measurements on your bike... It's confusing how the new OEM spring would be much shorter than the old springs being replaced....

[@HackaweekTV]

I don't recall the dimension. Your new springs are probably made better and have a higher "spring rate" which would explain why they are shorter.

[@SeanBZA]

I needed a pin drive for a pneumatic cylinder, so made one out of an old steel box section from a broken chair, and 2 steel pins brazed into it. Then used the same bar again as a guide tool to align a casting into a housing, just by drilling a hole and using threaded rod, with some copper water pipe to cover the threads where they run in a needle bearing, and a nylock nut on the bottom with a plate to hold it. Top has a nut to lift into alignment. A lot easier than the method of holding a 10kg casting with one hand and trying to get 3 bolts into the blind holes, all done through a small access panel at the side that barely fits an arm, complete with razor sharp edges.

[@DeanSegovis]

SeanBZA Awesome! Making your own tools is great!

[@RonaldCiubuc]

As always..good stuff. Keep it coming..

[@vierlingfabien369]

Hello. Super tutoriel mécanique tu est un bon passionné je regrette que la traduction n'ai pas en français. Encore merci de partager ta passion. J'adore ta moto.

[@TheCarablanco]

Gotta Luv your tool hacks. Makes me appreciate even more how much goes into one of these motors. ~ S ~

[@poulsejr1]

The four clutchsprings have a minimum lenght too, I renewed them at some point to help avoid the clutchslip that is a problem on the 70 Hondas. I enjoy following your videos :-)

[@DeanSegovis]

Poul Erik Sejr Nielsen Good point. I probably should have checked those. I'll renew them with the clutch discs in the future after a break in.

[@poulsejr1]

***** An easy access task later. And I had made a mistake about the engine oil too, used some with additives (PTFE) for less friction, which gives you a problem with the clutch.I don't know if they later made some changes to the frictionplates to deal with the modern oils.

[@andrewnovotak7663]

I believe the springs call for...no shorter than 30.5mm, and all the same.

[@maxcorpious]

Great Job Dino! This bike will be pretty much brand-new, once you're done. You're my inspiration to do my '78 Yamaha XS750SE engine rebuild. Does it matter which way the seals go in? Nice work on the home-made special tool.

[@captainflugel]

Great videos. I have watched many of them for tips and info. I have to ask about the clutch release plate. They are super fragile and you spun yours down with a power driver and torqued it to 9 ft lbs and didn't break it! I carefully tightened mine down one or two turns at a time of the 4 bolts, got them all in no problem, and when torqueing to 9 ft lbs, SNAP! broken plate. I have been advised on other forums this value is too high and was changed in some service manuals to 6 ft lbs. Might save someone else a broken plate if you mention it.

[@VredericUtgar]

Don't know if this has been added, that cupped "thrust" washer you pulled form the clutch pack is called a bellville washer (sp) they are used in automotive transmission applications as well as I'm presuming elsewhere

[@user-eq9mu4rc4g]

Nice your handmade tools!!

[@themistoklesv]

Nice as always, being a detail freak myself would you consider cleaning any excess Honda bond and aircraft gasket staff?

[@wald01979]

i just watch another video where the author was using a screw driver (scuffing the locking washer in the process) vs. a punch. Glad to see it done properly.

[@janedavies3099]

excellent instructional video, thanks

[@ibrahimbawi]

I've been investing time to watch your complete build. Please don't fuck it up by hurting yourself. "SAFETY ALWAYS"

[@DeanSegovis]

Ibrahim Bawi You bet!

[@scootergeorge7089]

Do you recommend a corrosion prevention oil for the case screws to prevent them from freezing into place? Steel screws in aluminum tend to do that. While in the Navy working on the A-4 Skyhawk (Scooter) this was required for fuselage access panel screws.

[@humptydumpty384]

Great video on clutch. Anyone have any idea after reinstalling clutch why I would have a very soft clutch lever. It seams the clutch won’t disengage once started and in gear

[@stephenward8550]

u didn't check all clutch plates? You should check the steels as they warp also spring free length?

[@fe6646]

Do you have to drain the motor oil to replace clutch plates? I haven't seen any more videos of the cb750.

[@skycarl]

Nice tool fabing Dino. Btw..Didn't see JFet around. Thanks Carl

[@DeanSegovis]

skycarl He was in the office editing videos. :)

[@patdennis3751]

Is there any special order to how the plates are installed? Direction etc? I'm starting with an empty drum so I have no reference to reassemble my new clutch.

[@trevorwolters4065]

Hey Man, really love what your doing on these vids, I'm restoring a cb900 custom and really enjoy watching your extremely informative vids well done Quick question, the clutch springs that I removed needed replacing and I bought some from Sasquatch motor sports. a when I received them they spec out at 38.34mm free length where as the field manual calls for a 35.3 mm I just notice that it puts a lot more pressure on the clutch arm assembly is this going to create a problem? Kindest regards

[@crispinleslie]

Hi Dino. I want to add my thanks for your videos; I have a 1982 CB750 that needs (valve) work and 75% of another one which I will customize in due course. I feel like I am a (53 yr old) apprentice with 24/7 access to a master craftsmen. Your brilliantly presented lessons have given me the confidence and enthusiasm to indulge my love of vintage Honda's, and save me hundreds of dollars. I want to contribute to your project, but I have problems with pay-pal; is there any other way you can receive funds?

[@danielalbertohernandez8678]

Buenas me gustaría descargar el manual de el motor de la honda cb 750 custom modelo 81 en español

[@brucekirk89]

Been watching your vids for awhile now best dyi motorcycle show on KZbin..but I have a question I had to take off my clutch case and cable to get to my drive sprocket but I can't get the clutch to adjust right won't disengage all the way back tire still spinning some with clutch pulled in..can u help me plzs

[@Gulgonful]

Homemade tools? You and Ichiban must know each other!

[@christidmas3995]

Good work

[@Vfh........y]

you are an excellent teacher........just Please.....put that socket in a portable vise when using the angle grinder. Hare to see a finger fly off. ;)

[@MerlinZener]

watching you grind away at that socket holding it in your bare hand, this little voice in my head was saying, doesn't he have a bench vice? Oh yes, last time when doing the starter motor I'm sure I saw one then... [ok ok maybe I'm being overly safety conscious...] Am I? :)

[@afro20man]

I heard the little voice too saying "one slip and I have your thumb"

[@WayneJohnsonZastil]

It's a grinder not a cutter yeah hurt but would not cut of your finger!

[@DeanSegovis]

Merlin Zener No danger of cutting my finger off. I did it on the floor to keep the metal dust away from the engine and workbench.

[@afro20man]

Wayne Johnson tucking my tail now... (:

[@MerlinZener]

***** good point.

[@gasousman]

Graphite?

[@biofractal78]

Dear Hackaweek... I would love to ask you a question regarding the stator. Is there anyway I could email you privately? Thanks you. My 1978 CB750K is giving me issues with the charging system.

[@novachannel1981]

Great video thanks

[@turboG3]

the hackaweek pipe (Brand patent and registered by videoes hackaweek) jajajaj good video

[@Mekhanic1]

To remove that nut, you could use a hammer and a soft drift/punch to tap it loose.

[@DeanSegovis]

Mekhanic1 Sure you could do that in a pinch.

[@gordonollerenshaw7784]

great videos. just wondered what brand assembly lube or grease you use

[@HackaweekTV]

PRM 81950 Ultra Slick Engine Assembly Lube from Advance Auto Parts, or Amazon

[@NickyNooNah99]

Just out of curiosity, the friction disk that you measured; was that worn from both sides or just one? because it was an outside disk does it experience half as much wear as the others? would it be appropriate to measure an inner friction disk?

[@NickyNooNah99]

And is there any specific dimensions that the springs must conform to?

[@shawndaley14]

Any ideas why my cb750 km won't move even if the clutch is pulled in? I took the clutch assembly apart and noticed the spring are 35mm long but he repair manual calls for 31mm. Could this be causing the issue? Also, when it clunks into first gear the clutch lever as nearly all the way out before it grabs. Is there to much spring tension and not allowing the friction plates to separate properly? I also measured the thickness of the plates and all are within the recommended specs. Thank you in advance. Great videos!

[@shawndaley14]

CB750 K2 (1972)

[@krabkrabkrab]

One dowel? Should be two. There are two shown on the parts page and the gasket itself clearly shows an extra large screw hole at 16:37. on the left side of the view, just below (above on the bike) the kickstart shaft.

[@HackaweekTV]

Direct quote from the video: "there's one alignment dowel stuck in the side, there's another one in the case" That's two. :)

[@Motor-City_Ben-Diesel]

Do you use gasket sealer when you replace all your gaskets? For example the head gasket?

[@HackaweekTV]

Only on some, not the head.

[@williamavelar1183]

Este è o video que eu estava esperando, obrigao!

[@DeanSegovis]

William Avelar Obrigado por assistir :)

[@williamavelar1183]

eu é quem agradeço por voce passar seus conhecimentos,muito obrigado

[@williamavelar1183]

grave um video de como trocar a corrente primaria sem desmontar o motor... é possivel?

[@floystevens1141]

dean, i wish i was your neighbor!

[@carlo1898]

bravissimo, grazie

[@clandestine.racing]

Please, i need the manual

[@HackaweekTV]

www.ebay.com/itm/276055172554?hash=item40462

[@GunFunZS]

Same tool I would have made. That's what those cheap Chinese sockets in the bins at pawnshops are for.

[@GunFunZS]

BTW thanks for making the clutch job look easy. I haven't been looking forward to doing the clutch on my old KAW, but now it doesn't look like a very big deal.

[@MegaTroyhamilton]

+GunFun ZS 22 mm, 50 cents!

[@jeffbecker7703]

Bike newbie here - this is blowing my mind that the clutch discs are apparently kept surrounded by and bathed in engine oil. I would have thought, as with an automobile clutch, that those surfaces need to be kept dry. So is it engine oil, or is there a separate lubricant source? Weird.

[@DeanSegovis]

Jeff Becker It's the engine oil, but when you consider the surface area of all those discs, it's as much or more than a car clutch.

[@jeffbecker7703]

***** OK, understood, but just trying to figure out the wet clutch thing and theory of operation. I am guessing that it has to do with so much friction surface in close proximity so the oil is for heat dissipation? If so, I just wonder how much clutch action is lost due to slippage. The clutch surface material would have to be different than on a car?

[@DeanSegovis]

When the clutch is released with the engine running there's no pressure pushing the entire pack together so the fiber discs and the metal discs are slipping past each other. Without oil, they would heat up wear quickly. Automatic transmissions in cars have the same clutches inside them and they are operating in transmission oil. The design allows a large surface area of contact in a very small apace.

[@jeffbecker7703]

***** Thanks. I get it now. I thought it might be similar to auto transmissions which is why I originally asked you if there was a different lubricant source. Looking forward to the next video and more custom "hack" tools.

[@philipflynn7781]

I have that tool

[@themistoklesv]

Stuff

[@wickjohn2200]

🐕

[@rodrigoaraujo8713]

You would have the parts list to send to my email thanks.