73 Honda CB750 Custom Build Part 19 - Camshaft & Valves
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- เผยแพร่เมื่อ 16 ต.ค. 2024
- The camshaft is what allows an to engine breathe. It's rotation opens and closes the intake and exhaust valves. This week we install the camshaft, set the camshaft timing then adjust the valves on the 1973 Honda CB750 engine.
You forgot the spring in the cam chain tensioner! You helped me figure out how to get the cam in . I was going nuts ! Your video helped out a lot thank you. Peace
To heck with those points.
I got rid of them. I went to solid state, never had a problem. Always packed a point plate with you , just in case.
Great work Dean I am now a subscriber. It is so refreshing to watch YT videos that cover the whole process in detail (including educational mistakes), along with good tips and constructive viewer feedback.
I have renovated a few bikes over the years and for me the engine builds were the best bits, after 40 years of working on bikes and cars (as an amateur engineer) I am still in awe of the detailed work involved in designing and making an internal combustion engine. Thanks again.
I just realized that your dieting in this series is awesome. I know that can take as much or more time than just doing the assembly work. Thank you.
I recently picked it up an '81 CB750 that the previous owner had completely disassembled, stuck into 5 unlabeled boxes, and left in his garage for 12 years. I'll be watching your series for a while in the coming winter months. Thank you for taking the time to make these. Detail like this is hard to come by!
@brad althouse I have an 82 cb750 that is driving me insane. I removed the airbox and installed a K&N filter kit.
The 81 .... twin o/h cam .....is a completely different motor to the s.o.h.c.
I was given a 78 cb750. The man parked it in his yard in the open in 1981. Tank is in bad shape. Rims totally rusted out. Top end locked up. Everything generally is clean inside the motor. Hope to get it up and running soon.
Im getting close to opening up my own motor for a look. I know no motor is realy the same but these vidoes describing the details and the difficulties (not just what to do) realy help. Im not saying this is pure educational but it makes it more familiar with the components and the function. when everything is new its just a mess.
I adjusted my camshaft, my valves and my ignition system following your instructions, and it's awesome. My bike is a new bike ! Thanks a lot for sharing your knowledge.
This brother just blew everyone's mind with experience mechanics. Thanks for posting.
Great job. I really enjoy your videos. Very informative. Much appreciated.
Just picked up my dad's 69 cb750 and these videos are excellent. i will definitely be watching all of them on this series.
great job.
Hello Friend The simplicity of how you explain your videos makes us specialists, thank you very much for sharing your knowledge.
Ive always had a lot of mechanical car knowledge and really wanted to look into a cafe racer style bike. The videos and advice you give are excellent. Im picking up a fixer upper in a few weeks to drive around town and to work (5 minute trip with the new job). Cant wait to tear into it once the temp get above 40 here in Michigan, most likely mid April at the rate the temps have been around here. I have the confidence I can fix anything on it after watching all your videos!
Your presentations are crystal clear. Thanks so much.
Never understood what a valve adjustment was all about (I am not mechanically inclined, but would love to be). Thanks for the clear demonstration!
Someone loves Honda bond!great job Dean !
Another awesome video! Going todo my valve adjustment tomorrow(if I can find that small feeler blades locally anyway lol!). Do you happen to know if that final drive seal would on a 1975 750F could be changed with the crankcase together? I know you said later model F's but hoping you meant later than 75. Seems crazy to split the crankcase to change a seal!
I think it can be changed, but not 100% sure. Thanks for watching!
this is so helpful.... I will be getting 2 cb750s it seems and would love to build one.
Go for it!
Ola esse canal e otimo fico feliz porque tenho uma 750f ano 1974
Super video!! I only wish you have a video just like it for a 1980 CB900C, i have to change my valve seals and would love a walkthrough of taking the cams off and on. If you know of any please post a link for me!! Thanks again great quality and clear instructions!
surprised he didn't go with solid state points.. So reliable older vintage shops have completely switched even on high-value collection bikes..
i really appreciate your time, your dedication and thank you, thank you very much
Excellent video. Thanks for all the detail and high quality video.
I have enjoyed this series of videos. I have 4 cb750 SOHC bikes and have a rebuild coming in my future. I have watched all your videos from the first to the last. Very informative and confidence building. Thanks for the time and effort it must take and for the video editing as well. You certainly must be short on time almost daily.
:)
another great video dean and i all ways watch your full videos most youtubers have an attention span of a gnat
youtube has not been updating my subs lately , i have to manually check for videos , glad i checked . great show as always , i don't understand how you don't get more views .
jerry henderson Because it takes an intellectual mind that is willing to actually learn something and sit through a 30 minute video. I think a good majority of TH-camrs have an attention span of 10 seconds. My average viewer engagement is 7 minutes.
Thanks for watching! :)
*****
Agree about the short attention spans. Appreciate your time, efforts, and thorough work. What I appreciate most, however, is that you have the confidence to recognize the limits of your knowledge, do the research, and methodically work through problems, rather than feign a knowledge of everything. It's ok to learn. Cheers from Mn.
You might have given me the courage to rebuild my CB750K this winter. I got it for free.
It's interesting that the camshaft is secured at 4 locations which what people say is over defined and there are no bearings to help the camshaft rotate smoother. I'm trying to understand why they design it like this.
Awesome videos!
pusinxx Many overhead camshaft engines are designed this way. The camshaft has very little side loading on the bearings so this type of bearing works ok.
with perfectly round polished steel and some oil that section of the shaft is a bearing . no doubt there are ways to improve , i don't know about bikes but some later model v8's started using roller rockers because the cam lobe is prone to wear out , i've seen lobes with 1/8 inch deep grooves worn into them .
jerry henderson Bigger springs for the bigger valves means more resistance and more friction. That mass has to stop moving and reverse direction which equates to some high peak forces.
I have read that the spindle bolts rob horsepower. Supposedly the early model bikes didn't have the bolts. Trade off is possible rattle at higher rpms
Loud n clear mate.. 👏👌
Great video series! I'm about to get my first motorcycle -- a cb750k4. I've watched this whole series from start to finish in order to get familiarized with the bike and learn as much as I can about it. Rookie question: why don't the camshaft journals require bearings like the crankshaft and connecting rods?
You put assembly lube on every metal-on-metal part EXCEPT the adjuster screw end or the valve stem end where they meet (or did I miss it?). Pretty important not to have them start off dry.
Fascinating series of videos!
Was hoping you would do the cam chain tension adjustment in this. Hmm. Guess I have to read the manual now.
Ty for all the great tips and information, you make it look easy!
always wanted to rebuild a MC engine.. It would prolly take me a year to do this
Can you make a comment about when you use the permatex vs the hondabond, and when you use red/blue locative.
thanks a lot bro....what a job..commendable one
Please don't forget to loosen the adjust bolt after you get done. To many time is it forgot about and eventually bad things happen, mostly noise.
***** Yep, did that. :)
@Adam, can you elaborate a bit more? Like a video timestamp? I'm about to start this process and any additional help is great!
Great Video; highly informative.
great video and grats on getting married
you could have put the cam sprocket on the camshaft before installing on the head
BOA TARDE.
O VIDEO DA MONTAGEM DO MOTOR 750 FOUR E EXELENTE, PORÉM EU NÃO ENTENDA NADA DE INGLÊS, BEM QUE PODERIA SER LEGENDADO PELO MENOS.
MAS INDEPENDENTE DO IDIOMA DA PRA ENTENDER BEM MONTAGEM, NÃO PERCO UM VIDEO DESSA MONTAGEM.
Great Video! Many Thanks
I wish you were my dad
he might be???!!
Great information and video! Thankyou!
Best video ever. Thanks
Excellent Video !!
Right now I'm putting together a 1977 model Honda CB750F engine (motor CB750E number 2615951) to recover from a failed mechanical unarmed, and I have great doubt. you begin chapter 19 with two small pieces through your fingers ( Calls orifice oil control Partt number 12238-300-010) in my engine are not present these parts.
It is possible that in this model not bring? what if I build the engine without these parts?
thank you very much
were my eyes playing tricks on me or cylinder #3 inlet valve spring looks upside down and I always believed when tensioning it should be tension-ed from center out
love seeing this go together. Any thoughts on trying to run the motor on the stand once you get it together or will you wait till it's back in the bike?
Run it!!!!
***** I'll probably run it in the stand first. :)
Yipee!!!
Ευχαριστώ πολύ
Very good, thanks!
O cara é bom mesmo, otimo professor mesmo sem entender o que ele fala! seria otimo se fosse com traduçao, grande abraço parabens
Ευχαριστώ πάρα πολύ
Just wondering if you were planning a carb video at some point?
What's the torque value for the thrust plate bolt on the end of the cam shaft drivers side?
by chance do you have a list of o-ring/rubber pieces with part numbers for them. I'm collecting parts for my project
O óleo, graxa,e as colas que usa na montagem, podem contaminar o óleo que é especificado para o funcionamento do motor?
O correto não seria o mesmo óleo que irá no motor?
Gratidão.
Grande abraço a todos.
Sem contaminação.
I just checked my valve clearance a couple days ago. After watching your video I realize I definitely set mine too loose. It's making my tappets louder than usual. I didn't realize they should be that tight on that feeler gauge, I set it so there's just a very slight bit of friction on the gauge, it moves very easily in and out... not enough friction to hold the feeler gauge in place while it hangs off the engine like that. I guess I'll go back and re do it. Should it be tight enough to where the next size gauge up won't fit...or will that next size gauge just be super tight with a lot of resistance?
would like an information, the clutch housing cb 750 k2 is compatible with which models cb 750 k, personal hug
love your videos bro your like my personal mechanic for my bikes I have a ? for you
Ok...I have oil in my stator not a little but like a quart or more I can't figure out were it's coming from there is nothing in between the hole I look a few times maybe you can help me out
What is the range of your feeler gauge? Is it the same one you used in previous videos?
Hi! Thanks a lot for your videos!
I have one question: where did you find the two oil jets, and how did you do to take the old ones off?
Thanks a lot!
+cricrii1 Mike Rieck. Google him.
Does the camshaft positioning also apply to the cb650?!
Hi, great video... How do you know when you're at 4 top dead center, what does that look like? at 30:25
A straight 4 fires and is at top dead center every 180 degrees. The firing order tells you which cylinder is next after #1. Then turn 180 for the next in the firing order etc. The valves will be loose on the cylinder that is on Tdc and the cam lobes will be away from the rockers. A v8 auto engine fires every 90 degrees of crank rotation. You can put your thumb over the cylinder and turn the engine. When the air pushes your thumb off the plug hole, the valves are closed.
@@graymodeler Thank you very much William... what if the person accidentally put it with the notch down? So it was 180 degrees out. Would the person (cough) have to pull the engine from the frame again and start over... or could you still get the timing correct? I have a Dyna Electronic Ignition... if it was 180 degrees out would I be okay?
Am I ok if the cam notch is down when #1-4 is TDC and both rockets loose only on 4 or must it be #1 that is TDC and cam notch up. ?
I have the same problem om my bike. Did you change it?
what is this substance that lubricates the rubber seal in 8:00 minutes?
what kind of torque wrench are you using?
can i use the "aviation form a gasket" instead of the white bond you are using here?
+juan ignacio Hernandez I suppose it would work, but Hondabond is best.
Would you mind sharing the part number of the Hondabond you're using?
Assembled Camshaft and I can adjust the valves as per catalog....its almost as if the cam is 180 degrees off? If I rotate cam 180 with notch down and leveling marks horizontal with retainer. Help!
+pllagro - I can adjust intake and exhaust tappet on cylinder #1 but not the other factory specified ones per book...Such as exhaust tappet #2 and inlet tappet #3----tappets are all the way out and I still can't adjust???
@honda850chop I've re built this 2X now. Yes, last go round. It was a timing sprocket position. You have to get the sprocket bolted correctly along with chain positioning.
Would this be same rebuild for 1976 honda cb750a hondamatic?
How much is somthing like this?
Hello! I realy like Your video about Honda 750. I have 3 of them, one K1 (-71) and two K2 (-75). I am restoring these bike. I saw You had nice blasting sketches and wonder if you would like to email these to me? Best regards! Anders Lövdahl / Sweden
Where can one even find a .05mm feeler gauge? That's super thin!
Auto parts store.
osea que al calcular tu promedio de videos vistos yo seria uno de los pocos que ve el video del segundo 1 al los minutos 35:02 ?? realmente a pesar de que este en ingles y no entienda, porque no hay subtitulos, te haces entender bastante bien y realmente me gustan mucho tus videos, se valora tu esfuerzo. saludos
PD: vos como yo tenes un traductor en el youtube que te tradusca lo que yo escribo en español al ingles? porque me resulta dificil hablarte
M.G.F Turbo "I mean that to calculate your average watched videos I would be one of the few to see the video of the second one at the 35:02 minutes ?? really though is in English and not understand, because no subtitles, you make yourself understood quite well and I really really like your videos, your effort is appreciated. regards
PS: I got you as a translator in youtube you Translates what I write in Spanish to English? because I find it difficult to talk"
Os traduzco aquí con traductor Google. Gracias por su atención. Estoy feliz de que usted disfrute de mis videos. :)
*****
no me agradesca, usted se gano mi respeto al hacer tan buenos trabajos y compartirlos con nosotros, en todo caso gracias a usted por hacer lo que hace. siga asi un saludo cordial
Where did you find the oil metering valves? I need 2.
We're do you buy your parts at
www.hondaparts-direct.com/
Wished i kept my cb400/4 now. :(
Yeah you fucked up.
What’s up my friend. Can you fix it my CB750
You can...
19:29 isn't 15° after TDC ?
Never apply sealant to an o-ring and you’re NOT at 8lb/ft after you click it 4 times. Geez dude.
nice tee :)
You clearly no your stuff about rebuilding this motor are you self taught or trained? The reason i ask is I'm having problems with mine and was going to tackle the issue myself. I have basic skill with a motor and thought I would have ago.