How the Honda Semi Auto Clutch Works (50, 70, 90cc)
HTML-код
- Опубликовано: 27 июл 2024
- *Index below*
0:00 Introduction of Clutch Pack
1:53 Intro to Functions of the Clutch
2:56 Explanation of Parts
10:28 Centrifugal Auto Disengage Mechanism
18:12 Shift Disengagement Explanation
25:44 Slipper Clutch Mechanism
31:15 Oil Filtration System
Here we explore the insides and workings of the Honda Semi-Auto clutch pack, the same basic clutch in use since 1959 all the way until 2012 in Japan. 
Авто/Мото
How would this work for kickstarters because the engine would be at so low rpm that the clutch plates would never get up against the weights?
Hi there, excellent point and I've been thinking about this for the passed few weeks.
I think the answer lies in the ramped centre collet, and what I thought was the slipper clutch. I originally thought that when the rear wheel "pushed" the engine (like on decel), the collet would temporarily break the clutch plates away and disengage to prevent wheel lockup.
But on the semi auto bikes one thing any rider will know is that when you're in gear and you push your bike forward with the engine off, it engages the engine. When you roll it backward, it disengages. And likewise when the engine is running even in gear, it disengages the clutch.
So what that means is that what I thought was the slipper clutch is actually a "grabber clutch", which engages the clutch when there is "back pressure" so to speak, like when the wheel is pushing the engine or, when the kickstarter is engaged.
Either or, excellent observation and I'll pin the comment so people can see the correction and explanation.
Cheers,
Mini Motor Man
I think it uses oil pressure to disengage once started witch is the genius of this clutch.
@@minimotorman5931 I believe you are precisely correct. Even at idle or stopped the engine will not drive the transmission, but the transmission can spin the engine forward- allowing compression hold back and allowing the starter to turn the engine forward.
Does this semi-automatic clutch have anything to do with the kickstarter, because I can't find anything wrong with the Kickstarter mechanism on this little XR70 please help
Does this semi-automatic clutch have anything to do with the kickstarter, because I can't find anything wrong with the Kickstarter mechanism on this little XR70 please help
As people would be riding on them for years, I have always wondered how this device did work. Currently I have been reading and with current technology watching all that I can, trying to understand the little device that got my attention back in the 1960s.
What a completely fulfilling explanation of function involving this device.
Thank you
Absolute genius. Both the clutch and the instructor. 'Hello Bob'. Gold.
I liked the 3 kilo rock in the face gag myself.
If I can click the "like" button more than one, I would have been clicking it over and over the entire time watching it.. very detailed and precise!
Why only one glove?
Great job in explaining the clutch mechanism! I always been fascinated by how mechanical things but this one always had me scratching my head. Hats off to the person(s) who designed this unit many years ago, truly one of the most ingenious mechanical devices I've seen over my 60 year life span. There still in use today, recently been working on a China made 110cc ATV with one of these clutches.
While I am fortunate enough to have known and understood this wonderful, elegant piece of engineering, before I saw the video, I must say that I was absolutely captivated by the precise language skills of this young man. With perfect diction and a good clear voice, he projects such an accurate description of what he is doing and what he is showing, including the description of the item and the processes and the actions and the locations relative to each other. I must say that I enjoyed listening to this young man and to confirm what I just described I even closed my eyes for more than 75% of the video and believe me, I followed it all, as the picture painted in my mind by his voice description was more than enough. The English language is not my mother's tongue and here is the reason why I closed my eyes to test myself!!:-
More than 30 years ago, I had two university students (brothers) who unfortunately had a father who had lost his sight and he never really ever saw his two sons but he knew them only through their voice and his ears. When I first met these two brothers I was stunned by the manner in which they spoke and how they described their laboratory and workshop and their answers in the engineering examinations. It was sometime later that I got to know that their father had lost his sight before the children were born. The manner in which they spoke to their father had to be such that they painted every detail with their voice.
So congratulations to this young man on his interest and ability in understanding this complex mechanical engineering but I must heartily congratulate him on his ability to express himself in such accurate engineering language with no unnecessary frills but such an exact description of the complex invisible functions in question which are invisible and silent in their actions when the cover is on. Well done young man.
This is why I love Honda. The engineering is unelaborate and functional. Everything you need without being over complicated.
I just rebuilt one of these clutches today... Found the video afterwards very informative & they are amazing little pieces of engineering.
my moped is still using this kind of clutch basket. good thing there are still chinese aftermarket parts on this, lifan motors china develop this kind of engine in 1960 by honda tokyo and lifan which is a weapon maker since 1940's.
This what I've been looking for,so much videos showing how to replace clutch plates but few or even one clear tutorial on how this thing work,....
And i thank you sir for sharing ur knowledge 🙏
That has to be one off the best “how it works” video for the clutch system. Incredible design doing some many things too
Great video! I'm having some clutch issues while shifting, and while I understood how the bob weights worked at idle I could not for the life of me figure out how the clutch disengaged while shifting. This demonstrated exactly what I needed to understand and now I have some good new ideas on how to effectively troubleshoot. Thanks so much!
I just learned more in 30 minutes than the last 5 years about three wheeler clutches. Thanx bud
An amazing explanation for an amazing piece of engineering. I finally understood how it performs so many functions at once, and why the motorcycles it's used in usually don't have oil filters or meshes of any kind. It's still amazing how compact and rugged it is. No wonder these seldom break down, unless you ride like a hooligan. :-)
You sir are a genius , you don't know how much you saved me , this is the best explanation of how these clutches work , thanks you sir you gained a humble subscriber :)
Thanks so much for the video! Recently moved to Vietnam to teach English and really wanted to know how my Semi Automatic worked!
you are a mastermind, such a thorough explanation.
BRAVO!
Thank you, I watched the entire video, and its very informative... Thanks for the effort of making this video...
What a fantastic piece of engineering. Great video and explanation thanks.
Thanks for a great video! I was just thinking to myself "I wonder how a Honda Cub clutch works? 🤔" and this video was exactly what I was looking for! 😁
great video!! so glad there's such an in-depth explanation. i don't even have a super cub, i just love them
The oil filter part blew my mind!! Great video.
Thank you so much for this great video. You are really a great teacher, i love to repair my own bikes on sunday (i am not a pro mechanic) , and this video taught me more than i have learned in the last 5 years. I really thank you for taking your time to explain.
Really nice video, and very informative! thank you for taking the time to explain everything in detail
Thank you for articulating the inner workings of the clutch, I'm going to check how much crud is there now. Many thanks.
Before knowing this i really like to have one dual clutch motor,but after watching this i now appreciate my motorcycle now,really its GENIUS
Great video. I love the details. Thanks.
Absolutely brilliant! Painstakingly detailed. Thank you
Thank you so much for your in depth explanation. This is wonderful.
Danke, das man die Technik erklärt bekommt und somit mal sehen kann.
Very very interesting video and very understandable... I personally work on my little semi automatic motor once in a while and this video explained some questions that I have for long period of time... Thank you and keep uploading videos like that
damn, thank you so very much. You explain it thoroughly with so much detail and yet still able to keep it simple enough for a electric engineer like myself with some fundamental mechanical knowledge could understand. I've looked for this quite a long time and did not expect to get my life-time mystery could be solved here :D
Again, thanks for the explanation. Keep up the good work!
Fantastic video. I really appreciate this. Worthy of many thumbs up.
thank you, this was really helpful
Brilliant video. And brilliant Honda design.
Really the best explanation out there... thanks
Very good and informative video explained in detail!
Excellent teacher
Awesome explanation! Thanks
awesome , you deserve an academic oscar . thank you very much
very informative sir thank you
Thank you so much for such a nice explanation!
Great video. I'm glad I found it.
Great Video! I just purchased my first Honda CT-90 (1700 mi) and it is not shifting well. This helps me understand HOW it should work. I may have to get into the engine and see how the clutch and gears look (never been into an engine before). I am going to open it up tomorrow and check to see how my clutch oil filter looks... Thank you!
Fascinating, Thank you!
Thanks for awesome information
Great video
Thank you for this video I have learned a lot of this well done
Great explanation, thank you very much
Clever engineering well explained.
Great video on à genius device
no wonder my old 2011 chinese moped 110cc still runs so good and still sounds like brandnew up to now.
Very help full... thanks you so much ..
by this video, I'am not gonna hesistat anymore to upgrade my suzuki smash to 250 cc :3
Great job
Great video. Thanks for posting. I'm in the process of getting my '72 z50 going again and always wondered what kind of magic happened with the auto clutch to make it work.
i have same engine but a manual transmission. i got 2 of them, the other was 11 year old which is semi auto. they are both chinese moped.
Brilliant design.
Exellent. Thank's!
Fascinating video, thanks. I recently ended up with a 1962/63 C100. Is the clutch/transmission design much different than the one in this video? I'm having issues shifting up or down into 2nd gear, hoping I don't have to split the cases.
Thank you for this. I just got a pretty sad Honda Monkey and they have this clutch. So now I know a little more 😀
Thank you for this explanation, I always wondered how these semiautomatics worked. I think Monkey and Dax lost character when they got the "normal" clutches.
That's a top-quality video right there!
Thank you so much.
I have been thinking about this for quite a few years.
I ride bikes and (CVT) scooters, and I do 90% of the maintenance myself.
I had assumed that the clutch mechanism on a "clutchless" scooter was somewhat similar to the clutch sub-assmebly on a CVT scooter, in as much as low RPM engaged the clutch (reduced the diameter across the clutch pads) and higher RPMs disengaged it in the opposite way.
Presumably, and it was not mentioned in this otherwise superb video, if the gear change pedal is kept pressed down, then the clutch will remain engaged and the bike will coast, rather like a manual bike?
Japanese pizza delivery boy?
So you either delivered Japanese pizzas or you used to be Japanese?
I did not get that bit :)
Liked/Subscribed.
EDIT.
Oh, and are they still the same now?
If I can manage to get myself one of the new Honda CT 125 "Hunter Cubs", is this what I will be maintaining?
Big thank you!
Great video sir!
I have a 1986 Z50J and just recently the machine has started to "stall" when I get to a junction /stop etc. It's as though the clutch is dragging as when I put it in gear the engine revs drop quite a bit. It gets worse the warmer it is, I was wondering what this might be. Any thoughts would be welcome.
I listened to your machine at 1:55 and your revs don't sound as though they drop at all.
Thanks again
I've had cubs which we call crunch box back in the day. I never knew they are so sophisticated. I love those little things. Great video.
Such an engineering marvel. I want to know who invented this semi automatic tech. Did Honda invented it? This is to good, i wish this type of technology were used instead of the roller weights cvts.
Awesome video! Just subscribed! Thumbs up #466
Genius engineering! Seems more complicated than the motor itself...wonder who invented this clutch system? Thanks for the education!
Very interesting to watch and easy to understand believe it or not.
Now, how you rev match this thing? 😂
Yep Honda was a genius and you are too not many people can figure all that out. But to think Honda figured this and engineered this in the early sixties is absolutely genius. That same exact design is used in the today's 2023 crf50f that says a lot!! I own a Honda Rubicon with the Honda matic you should do a video on that equally as impressive maybe a bit more, by far the most enjoyable transmission I have ever ever experienced well maybe Toyotas hybrid synergy drive which just uses Sun gears to manipulate the transmission ratio but I'm off topic awesome video!
Thanks always wondered how these worked 😳do the little 50 and 70 trail bikes with out a clutch leaver also use the clutch as an oil filter?
I’m afraid you’re wrong about slip avoidance.
The mechanism involved does engages the clutch instead. That allows the engine kick start and always cranks the engine when you push, pull the motorcycle whenever any shift other than neutral is engaged.
Think about it.
With engine not running and any gear engaged you can move the bike backwards freely but cranks engine when you push it forward.
Try it.
It amazes me that all of this complexity (and that of the dual-clutch semiautomatic) is aim at getting rid of the clutch lever.
I wonder, why not so many Likes as views :)
how can i remove the auto clutch? i converted mine it work when gear shifting but when im in first gear and i dont press the clutch the auto clutch still works
What are the symptoms of worn clutch bell large springs, between the bell and first plate on an early C50? My clutch is quite noisy/whirs until i depress the gear shift pedal. I swapped everything but those in a time crunch and considering reopening to replace?
Mini Motor Man, Would it be possible for me to download this video and the one you made detailing the building and take down process of the motor you are currently working on? (Not via RUclips red, though.)
A centrifugal clutch at the front of the clutch pack and a manual clutch
at the back of the clutch pack being manually actuated by the shift
lever through the drum. A reverse torque mechanism to also actuate the
disc pack to engage the clutch to the engine when it's not running to be
able to start the engine by pushing the bike forward with it in gear or
with the use of a kickstarter. And if that isn't enough, a highly
effective centrifugal oil filter. All this in one little package. Did
the Japanese actually develop all this from scratch? I doubt it, but
they definitely improved on the technology.
Grippy force, love the tech terms.
Would a semi-auto to auto clutch conversion be a matter of getting an auto clutch and just dropping all the parts in there or is there something else involved in it? It wouldn't matter to me if I left the shifter on the bike since I could just take the shift pedal off. I'm trying to convert my nephews bike since I want him to get more power out of it, but the gears are too hard to shift for him even though I've adjusted the clutch as much as I could.
Thank for such a detailed video. During your presentation, we can see two types of slipper clutch collars, one with three notches and the other one with a flat top (30:26 and 21:28 respectively). Why are there two different types and what is the functional difference between them? Thank you in advance
Good video. How many miles on average would this type of clutch last?
Great video! Can I ask something I have my Honda 100cc it speed up to 60kph only and low power when high elevation is there something wrong with my cluch?
Due to the higher elevation it is more likely a carb issue. There is less air up high and therefore you need to feed the engine less fuel to keep the air fuel ratio correct for the engine to run right. Some carbs have a lever or button to pull out when on high but others require you to drop a jet size to get the job done.
Great video, altrough I go few questions. Bob's centrifugal weights basically act as clutch cable, do they wear out when you start moving or all force is taken by clutch plates? How to you move that drum? Is it linked with shifter?
Yes, it’s linked with the shifter ...
its was a mystery for me how asian semi automatic motorcycle transimission works. thanks a lot!
Sir, i own a china motorcycle with the same clutch as shown in your video, i have problems when i kickstart the engine the clutch slips eventhough ive already changed the clutch disc with new ones. Can you tell me good sir what might be the cause of the clutch slipping during kickstart?
Rad !
Is the 1980 ATC 110 similar?
Great explanation video.
Spanish traslate, love video
Blas rak paham 😁
Seng paham gur coro kerjone saringan oli tok 😄
Tapi tetep apiklah videone trimo tak tonton nganti rampung 😃
ok siap bosqu +1
HI, CAN YOU MAKE A VIDEO ON THE TWIN CLUTH SETUP? THANKS
Yes I have a 125cc manual 4 speed shift .I would like to change my factory clutch out to a automatic one ,is this possible to do this to convert mine to a automatic
is this clutch can fit to gear axle ?? or can be a replacement for manual multiplate clutch .. like manual to semi automatic :)
Very good technique . Please tell me Honda semi auto clutch pack price for 100cc in India . From where we can obtain Honda semi automatic clutch pack in India.
Hi
I have the type of clutch with 8 rollers instead of the one in the video with weights. And in the video I heard that there where different amount of weights depending on the cc of the engine, more weights for higher cc.
Does anyone know if it is the same setup on the clutch type I have with rollers? I mean if there are different size/weight of the rollers depending on engine cc?
The problem is that my clutch engages to easily making it jump or stall immediately when I release the gear shifter even at idle. There are new discs in it and it rotates freely when assembled but as soon as the engine is started it engages so my suspicion is that the rollers somehow roll out to easily and maybe are the wrong ones all together for my 70CC ST70.
//Ola
Nice! What about doble cluch ? New model have this
Hey Mini Moto Man
I have a question for ya....
I have a 1979 ATC threewheeler and it is a pull-start engine (4 stroke) but I have to either replace my first gear or use the old one if it's still good to use but I have to get through this 👆👆 part of the engine to get to first gear "how do I properly fix this situation" ??
Is it ok to launch the motor by holdin the rear brake n rev it above idol
Hi. Great videos. I want to upgrade Lifan 125cc pit bike from manual clutch to semi auto clutch. If I oder the parts can it be converted?
Just how do you consider that to be an upgrade ??
you mentioned CVT variator with centrifugal weights at 11:29, but to be clear, scooters have a centrifual clutch also.
how does the bell slides in when the throttle is released to change gear?
Thanks
This very important bit of information was left out of the video for some reason. I believe that towards the end he does mention that it is explained in another video. I know how the system works so I was waiting for that part.