73 Honda CB750 Custom Build Part 31 - Wiring Harness
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- เผยแพร่เมื่อ 28 ส.ค. 2024
- Installation of Dyna ignition coils, assembly of the battery tray and connecting of the wire harness.
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To learn more about what a rectifier does:
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I was given a 1973 Honda cb750 with about 34,000 miles last year. I was 19 and had 0 mechanical knowledge or experience but thankfully the bike ran good before it sat for at least 10 years with the fuel valve open so all I had to do was give the carbs a really good cleaning. After the riding season last year I realized that there is a lot of maintenance other than oil changes that needs to be done like valve adjustments and so on. You're videos have been and are a tremendous help. Thank you for sharing your knowledge with people like me. After watching your videos I feel very confident with my ability to do the valve adjustment and clutch friction plate replacement! Once again thank you very much for your great and in-depth videos!
Man, I was supposed to get the garage cleaned and some yard work knocked out, but NOOOOOO, just HAD to binge watch the CB750 vids with the same intensity as someone who just discovered Game of Thrones. Thanks. A. Lot. I'm getting Evil Girlfriend Eye now.
This is the closest I have come to understanding basic electricity! Genuinely grateful and kind regards from beautiful North Wales!
I replaced the harness when I was building mine and was having a hell of time figuring out why the battery was not charging but everything else was working perfectly. I have an aftermarket reg/rec and apparently with that combo you need an additional ground wire. Took me forever to figure it out!
Build is coming along nicely. Can't wait for more!
So far, on of the best in depth builds on TH-cam!
An entire electrical system with not a computer in sight. Sigh, those were the days!
It's amazing what you can learn watching TH-cam these days. I bought a 75 Honda CB750 last year and knew nothing about motorcycles or mechanical stuff. Thanks to channels like Hackaweek I've been able to learn a ton and do the majority of all maintenance and upgrades. I'm rewatching this video before I put my new Dynatek coils on. Seems pretty easy after watching this. (I'm not going to bother pulling the wires from the old coils, I'm just going to use new wire. The wires coming out of my coils are pretty crusty looking. I'm assuming you re-used the OG wires to save a little time not having to crimp on new connectors...or because you didn't have any new yellow, blue and black wire laying around.
Dino, Love your channel, esp. this 750 build. You are a natural teacher and you make your videos and the information they share, crystal clear.
Hey Dino, I have a huge amount of respect for you and the superior quality of your work. If I make it over to your neck of the woods this summer I would sure like to buy you a beer. All the best!! bill farmer
very nice. this helped. I went through my electrics on my 75 cb750f and since I'm running a new led brake light with turn signals, I had to get a new 3 prong electric flasher relay to get the turn signals to flash. people, keep your connections clean.
Good video, I will be busy with the same on my 79 750k as soon as the weather warms up here in Ontario! Keep the videos coming! Cheers, Rod
Nice video, Dino. You're doing it right. The wiring harness just runs right alongside the rail like you have it there and you use the little wiring clip/ties to connect it at various places.
Hello friend I am a year with problem with the electric of my 4/4four and his video was very useful, I live in Manaus AM although we have a subsidiary of Honda is very difficult to find this kind of information thank you very much congratulations for the video
I've learnt so much in these videos, answered so many questions i could never comfortably understand and now i do. Thank you for sharing and i hope you continue. Again i wish i kept my CB400/4 now. :(
Great video. Good coverage on a topic that baffles a lot of guys. One thing I would suggest is using some dielectric grease on the connections prior to making them. I've found that greasing the connections make it a lot easier to remake the connections if you have to disconnect them at some future date. I think that it also enhances the connections connectivity too. Just my two cents worth.
Anyway i now have back my original CG125 V 1997 that i had when i was 17 and found again 15+ years later :)
Awesome video! I can't wait to see this bike finished, it's going to be sweet.
Hey Dino. Bike's coming along nicely! I don't know if you're going to for a stock electronics system or not, but there's a few things worth mentioning that can upgraded with little effort. As far as the coils go, Dyna makes 5 ohm coils for these bikes and you won't have to run the ballast resistor. Part number is DC8-1. A upgrade of the fuse box to blade style automotive ones is also another good move and makes replacements easier to find. There are small 4 circuit ones that will pretty much fit the stock mounting studs with a little finessing. A lot of people also upgrade the rectifier to a solid state type that comes with the regulator built into one package from Rick's Motorsports, but that's your call.
remembered then my father rebuild his cb750 1972. had a lot of problem with the gas tank and the harness fitments.
try mount the gas tank with the harness in place that way you will know if you have done right.
wonderful jobs! can't wait to see more videos about the restore!
Great job making wiring not seem boring, Dino =)
I use the very same analogy when talking to new auto techs about electrical diagnosis.
When testing the diode stack, you kept saying VOLTS, instead of OHMS. A big difference!
those solid state reg/rectifiers work great and take up a 3rd of the original gear
Yes! Got my fix for the week.
My first CB750 was a 1969, one of the first sold in this area. Hated that 4 into 1 throttle cable assembly, constantly having to resync the carbs, ended up permanently mounting 4 vac. gauges on the handle bars.
I always learn a lot from your videos. Thumbs up
As usual, great vid; very helpful. Just one tiiiinnny little nit to pick: I was always taught that current from a source like a battery flows from cathode-to-anode, negative-to-positive. Other than that, great example.
+steven livingston Yeah that's why I said "really simplified" explanation of electricity. Electron flow comes out of the negative and travels to the positive. "Conventional" current flow moves from positive to negative.
I've enjoyed all your stuff so far.When testing your rectifier diodes surely your readings would have been in ohms not volts.
Hi Dino.....If this is an after market wiring harness...you will find out that the connector for the rectifier will be short...you won't be able to pull the harness back far enough because then you will be short to the head light....you will have to add on to the rectifier connector...also... the left hand switch...they don't sell it with the wiring outside the bar...only inside...you would have to get a 77-78 supersport switch or notch the housing of the switch...
Thanks! The housing that is powder coated and on the bike has the notch. :)
Great video Dino always informative and educational Thanks for your hard work
Thanks for the video! I'm doing a XS750 build and the electronics are sh*t. Really helped out a lot.
Awsome work mate, love your videos. Thank you.
Never heard the hill theory. I learned electronics with the balloon/rock theory. Same concept, different teaching methods.
+thatguy3428 Here's a more in depth article worth a quick look: en.wikipedia.org/wiki/Hydraulic_analogy
I respect you very much. Wonderful!!!
First! Electrical is my worst subject. Thanks for the explanation.
I respect you very much. Wonderful!!
I love the fact that you left the mess up with installing the battery box. Its something I would do. This will give someone else the chance to correct this before they try to install the box. Seen other videos where they edit those kind of things out.
Keep making those great videos and cant wait to see it finished. Do you think it will be done in the spring?
+David Bryson Aiming for April. :)
any plans on heading through PA again l'd like to say hi
Not anytime soon.
Neat job. I loaned my 750 to somebody (my ex) and the battery went flat?? They used jumper leads to try and start it and burnt out the complete harness by putting the leads on reversed. The earth wiring fused red hot when they turned on the ignition and melted everything. I was lucky I had a donor bike and managed to replace everything. WARNING Do not let others use your bike !!
NICE :)
Starts to look like a bike :D
I have been LOVING this project. I'm sad its coming close to an end though={ Any plans for your next project??? I sure hope so!
I was really hoping to see how you would test the regulator.
Would be a good idea to run your regulator/rectifier pos/neg directly to your battery and bypass the harness
Your awesome love your videos
I just bought a 1973 CB750! except its all parts... wish me luck...
good soy venezolano son muy bueno sus videos,quisiera saber donde puedo encontrar piezas en eeuu para para honda cb 750 f1 año 1977 gracias
Hi. By "coincidence" I recently found your set of videos on this CB750 project. I say "coincidence" because I am about to start a project of rebuilding my good ole' 1972 CB500. Thanks for the valuable information and tech tips. A lot of that applies to the CB500. My question is: Where do you manage to get those hard to find parts like the rubber grommets you replaced on the battery tray? Is there a place where I can get all that stuff? One thing that has kept me from starting my rebuild project is that I don't want to end up like some cyberpirate hunting treasures (parts) all over the internet. Thanks.
Do you ever think if the previous owner follows the build?
+james delmonte He does.
+james delmonte - I had the same question.
Thanks Dino. Why did you change out the coils? Also pretty sure your rectifiers have 6 diodes, not 4. I bet it is same as 1976 (K6).
Where did you purchase your harness from? Would love any follow videos on the harness.
On the starter solenoid there is that solid red wire with the female connection that you hooked up the positive to. What does that wire actually hook up too?
Can you help me? I am attempting to revive a 1976 cb750a , I received bike with none of the electronics included , I am trying to see if motor will fire . I can get it to turn over by jumping coils to battery and applying starter to coil. The motor turns over but I have no spark , I have the coils wires into the points system but there is no spark . I tested coils and they are fine, tested condensers and they are ok . Is there something in the electric that has to be hooked up that would allow spark to the points ? Thanks for any advice !
Really great videos, Dino. Thanks a lot for doing these. BTW, where did you get the portable 12V battery used for testing some of the electrical components in this video?
+Mac McMillen Found it on Ebay.
I purchased a new harness when doing my 71 K2, the earth between the alternator and the rectifier was not the same wire, no excitation meant no charge, suggest you check this.
I have a question...just started on my '74 Honda 750...wanted to know if using you as a guideline would be sufficient? Are the 73 and 74 the same?
Please up load video of Honda 200cc road master1983 engine over hal and vairing complete video thanks
Soldering is for computers! Crimp connections are better for cars/motorcycles
+Nothingyetful I beg to differ but soldering is the best connection over time.
+Dean Segovis I prefer crimp connection over soldering tho...
+Dean Segovis Why not Both? *zoidberg*
Thanks for sharing.
Out of curiosity, is there a reason you don't use any form of electrical grease on the connectors?
I used to use acid free petroleum jelly, but switched over to some spray from Wurth recently.
Any thoughts on the subject? Cons/pros etc?
Cheers
+Perius Silicone dielectric grease works well if you plan on doing a lot of riding in the rain. I'll mention it next video.
+HackaweekTV I put some on the outside of the male plastic connectors also. Makes disconnecting and re-connecting them much easier.
I think you forgot to put the first link you talked about in the description ;)
+STRIKERbe Right you are. I've added it. Thanks!
I bought a cb750 without a battery box and the harness is crap, what do I need for a custom harness?
Hey Dino, i have the 1978 cb750. i get no spark on my plugs, the bike was running before i took it apart, (only removed wiring harness) once i put it together no spark. the engine turns. any tips? would be appreciated
Hi , sorry to drag you back in time . Was your new harness 16 guage . Iv purchased 1 and its 12 guage . I concerned if i upgrade my electrics the 12g wont handle the cleaner power . What do you think . ?
Cheers
12 gauge will be fine.
May I have the make and model of the lithium charger you are using? Good videos.
How much rupiah for buy harnes cb 650 1980 police edition..
I need access to all of your videos on the rebuild 750 .
It starts here... th-cam.com/video/MkHJuU01-Wk/w-d-xo.html
I have a ? That's way, way, WAY off topic. @ 60yo I got bitten by the hack/electronic bug. My soldering bluntly sucks! Why are the solders black? Any tips would be great!! I'm using a 60w weller nonadjustable iron.
TIA
David.
+Stoneage Stoner 60W is pretty high for such thin wire like a motorcycle wire harness. Try a 30W with a "pencil" tip. And clean the tip with a wet sponge after every solder.
+Matt Sherrill thank you!
I'm not sure if you said in the video where you got the new harness from. Any details?
Hey I was 1k likes thanks man
What would you suggest for cleaning engine to look as nice as yours? Nice polished look?!
+Wesley Brown Alcohol based parts cleaner, rags, brushes, patience and time. You can buy aluminum polish to make it shine.
Oddly some 90s Fords use RED as a Negative for the Radio and Black as a HOT from the Fuse. I Found that strange as shit.
+TRX Vlogger Because, Ford. :)
Right! hahaha
Please show me about code of regulator of CB750 custom.
In which video # do you get to test the regulator?
Hello Dean
hope you see this, if the rectifier gives a little beep in the beginning when measuring the the reverse of the diodes . can this be fixed or is the rectifier for replacement ?
I followed your steps in the clip and the only problem i hav eis that little beep and when connecting this to the bike it brings de current down and blows the main fuse. Bike works perfectly without rectifier but than the battery is dead after a few miles.
Hope to hear from you Dean
Cheers
Flo
Sounds like a bad rectifier to me.
@@HackaweekTV thought so i gues replacing is the next step. Cheers
Are you Oke?! It's been a while
Hi, I own a '74 750/4 with KZ750 LTD mags, Dyna Ignition, Yoshimura pipe etc., but the poor old girl has developed a parasitic draw. She was fine when I stored her (inside, 2- 3 years, bought a Concours). Put her on the road this year and she killed a brand new battery over nite. Boosted her and went for a ride, same thing next day, completely dead battery. I have checked everything (turn signals, lites, all visible wiring) except for regulator etc. Do you think the short could be internal or am I just missing something right under my nose? Any input/suggestions would be greatly appreciated. Thank you.
Might try a new regulator.
@@HackaweekTV Process of elimination now I guess, regulator's a good place to start., thank you.
Dean, do you have a preferred method for painting a bare frame? I am trying to determine what product to use. I want a black frame. Its a 1972 CL125s with a sandblasted frame.
+Josef Molenaar My preferred paint is Duplicolor Caliper paint.
POR 15 might be a good one too. Very durable and cheaper than powder coating.
Hi if the start selenoid is bad the engine dont start?
when running that hotter coil did u upgrade the points system also
+JaenoClassik No.
Also are you going to run better air filters or stick with those cheapos?
+osamarama As I mentioned in the video, I'll be running the stock air filter. The pods came with the bike and are temporary, as I mentioned in the video. :)
+Dean Segovis oops, lol
+osamarama :)
Do you have a link or file for those print outs you have?
It was from House of Honda but they closed. :(
@@HackaweekTV yeah i saw that. Thanks any way. I appreciate your videos.. learning a lot from you. 🙏
HOW MANY VOLTS ???????????????????? OOOOOOOOOOOOOOOHMS !!!!!!!!!!!!!!!!!!!!!!!!!!!!
+CR2504life and amps too....
+CR2504life Kind of vague comment...