CB750 Chopper Revival - Fixing The Electrical!
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- เผยแพร่เมื่อ 28 ส.ค. 2024
- CB750 Chopper Revival - Fixing the electrical system! I take you through the electronics on this bike and show some faults, some modifications, some repairs, and do a systems check to confirm we are ready for that first start!
Wiring component sources I use:
Wire - 4rcustomswire....
Terminals and tools - cycleterminal....
First start video: • TWO CB750 First Starts...
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#brickhousebuilds #cb750 #motorcyclewiring
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HA! That secret key find was epic!! As you were unraveling the sock I thought you had just found a previous owner’s back up stash of grass!
I know I was worried thats what it would be lol
I was thinking it was gonna be a roll of 100's.
@@waden404 that would have been sweet
Money is stored in the gas tank!
@@paulrooney8164 Peter Fonda can confirm!
Dude, thanks so much for soothing my OCD with neatness and organization, lol. Those electrical connectors in the sorted boxes actually made me say "ahhhhh" out loud hahaha. LOVE the wiring episodes. :)
Hahaha glad it had that effect! I had an "angels singing" sound effect when opening the box but had to delete at the last second
Finally the Key reveal episode! I don’t really see how hiding a key would help if you needed tools to access, but maybe the motorcycle goddess was looking out for you when the previous owner had the idea to tuck a sock in the headlight bucket. So random and brilliant.
What a way to start a Friday off work when the kids get a snow / cold temperature day. 9°F
It has been a minute since it happened! I feel this would normally just need 3 screws removed to access so worst case you have to find a single tool to get it. Nothing crazy.
Im no electrician myself but I do dabble, however I love all those boxes you have with all the relevant electrical contacts / fittings etc inside. That's my kind of thing! Love it! 🙂
Have to stay organized with that type of thing
Great video matey.
Your no nonsense delivery . Gives folk the confidence to have a go themselves.
Well done sir 👏👏👏
Well thank you
Thanks for the new video man. Im already very competent with wiring and electricity, but I still love watching videos like this just to see what other people use and where they get their parts. There’s always something new you can learn. I learn something new everyday! Ready to see you ride this machine
Well thank ya! Glad you enjoyed
Ha! Wasn't expecting the key find That was great
Nor was I!
Kudos to fixing the harness, those boxes with sorted new connectors is my dream solution. I must admit I probably would've just gone with a m.unit or something similar, but keeping it and just fixing the bad parts is probably a lot easier 👍
I'd love to do modern wiring but you must realize the workload in the shop right now. Id rather put that work into a bike I really want to keep.
like the organization of the electrical kits you made up...time/money saver...and attn to detail evident..
Thank ya. A must for the stuff I work on
I was hoping that was going to be some cash - you know for emergencies. BUT that was awesome - what a hiding place for a spare key!
I for sure expected some drugz lol
That key hiding thing was very popular back then. You should be checking all of those old bikes headlight housings. Really fun when you discover such a treasure like that, the glee on your face 🫵🏻😁
Oh I'm 100% going to check all of them now lol. Really happy I got that on film for a lifetime highlight reel!
Had a couple of bikes over the years that i had to fully re-wire from scratch. 1 bike had a harness which was actually 3 different pieces of harness with the wires just twisted together and wrapped with electrical tape to complete. That was soon put in the bin. Any new harnesses that I made for bikes didn't always follow the manufacturers component positioning, so, I used to draw up an accurate colour coded diagram to give to the new owner when I sold a bike on. I like your diagnostic techniques and your collection of connectors, bullets, sleeving etc. You have my favourite flag on your hat. 👍👍
Glad you enjoyed!
Excellent video on repairing/rejuvenating the wiring in an older bike! Also loved the extra ignition key stash in the headlight bucket, classic 4 sure. That electrical terminal stash is a great thing to have, sure makes life easier with rewiring.
I remember rewiring the entire charging circuit using GM style weatherpak connectors on my '79 CBX turbo bike because Honda used a 14 gauge wire for battery charging and it always melted the red connectors in the harness and the reg/rectifier plug on quite a few CBX's(and other bikes) I've seen. I also ran 12 gauge wire all the way through the harness(untaping/taping that sucker was fun!)up to the ignition switch plug, solved a lot of voltage drop issues with the bike.
Problem solved, still works perfectly some 20 years later and charges a perfect 13.6 to 14.1 volts. Thanks BJ!
Definitely a great move there! Lots of work indeed
Funny thing is I've been rewiring a tractor at work the last 2 days, completely building an entire harness from scratch with relays, fuse blocks, ignition, everything takes time, that key find was awesome, I shouted no f'n way when I saw that.
Haha awesome vid, thoroughly enjoy the electrical vids.
Glad you enjoyed! We all shouted that together lol
Neat that someone else decided to make the rear turn signals into running and brake lights! I have done similar conversations to every bike I’ve ever owned! Very simple. To make them glow as running lights you just need to connect the positive lead to 12v through a 3A diode and resistor in series. This will reduce the voltage but still make then glow. When the full 12v for the turn signal comes on, the light will come to full brightness. I have forgotten the details of the circuit but some diodes to isolate each bulb so both don’t blink. There’s some more logic needed to make them work as brake lights, transistors or an “exclusive OR” logic gate can be used. I can research my design if you want to replicate the circuit. I still have a have a hand built circuit board at home, but it’s potted so I cannot reverse engineer it for you. But I have done it before!
Yea LEDs make that even easier when you vary the voltage
@@BrickHouseBuilds the trick is to make the turn signals blink when the brake is on! That’s where the logic comes into play! LED’s are much more sensitive to voltage variations. With incandescent you sort of just need be in the ball park. I don’t remember specifically what value but I think about 150-200 ohms. A 5w resistor is needed. I think I used a CD 4077 chip!
Credit to the previous owner. He cared for the bike and did a great job with the wiring. There’s no dodgy bare twisted wires and insulation tape there.
Exactly. Even if some things were out of the norm, they were done decently
Congratulations on how you keep all your tools and spare parts in perfect order! In mine the order doesn't last more than a week...😂
I have to! It gets out of hand quickly!
Very informative video, man! Great work! 👍
Thanks Andy!
What wizardry is this. I’ve never known that those plugs (7:30 or so) can come apart. Thanks . I learned today.
Happy to shed some light on the matter!
Love all your Videos BJ! They are so helpful! I am at similar point on my 73. Both #1 and 4 plug caps were open circuits so gotta replace those. I use 4 in to 1 as well. I'm replacing both coils because the plug wires are rock hard but will keep them because they ohm out correctly. I just want to thank you for the hard work you put into these instructional videos! I used your previous one step by step to rebuild the carbs on the 73.
Glad you found them helpful!
I thought the sock was going to be hiding some dope. lol A key is a much better find.
Thats 100% what I was expecting lol
I have been lacking in my commenting. Another great video! Can't wait to see the entire series for this bike!
It'd all good man! Glad you enjoyed
I hate electrical gremlins. Enjoyed the video B. J. Look forward to the double start-up video. RIDE SAFE OUT THERE!
Thank ya sir!
Great video. Can't believe you found that key in the headlight bucket!
I cant believe it either lol
And great ' old school' mechanics
🤘🤘
No wayyyyyyy!! Can't believe you found that key!!!!! Great hiding spot!!
Yeah I was super excited! Happy I caught that moment on video
Great video on electrical and 750 content Thanks , can’t believe you found the key in a sock in the bucket, that’s cool
I was so happy I got that on film. Would have never expected it
Dude you have a Scotland flag on your hat, all the best from Glasgow, Scotland XD
Haha indeed! Definitely check my Scotland video from last year when I got to visit. It was an amazing time!
very helpful to know what these bits are called, and the tool used with them. I bought a '99 suzuki SV several years ago to learn about this electrical stuff, and ride of course. I got it running and starting and charging, did a retro mod, changed the valve stem oil seals on the front cyl, but the fuses have been burning out. so I gotta do some harness work and this alone is a great help. Thanks for the quality presentation and the organization of your shop is also reflecting that. :D
Well I'm glad it was helpful!
I'm not sure about the plug caps you have, but some on Kawasakis I've worked on can easily be disassembled and cleaned up inside. The resistor is a little fuse-looking thing, with a spring between the spark plug connector and plug wire terminal at the other end. Often, these internal connections just get corroded, so you can take them apart, clean them up well (Caig Deoxit is great), reassemble, and you're good to go.
Some you can rebuild yes. I haven't investigated these yet but will need to going forward
Heyyo. I don´t know if anyone said this already but you can refubish the plug caps. You can unscrew the resistance in them and replace them. Atleast that worked on mine. Good video.
That would be a good move. I have seen some people do thay
Hi BJ I love the close up on the difficult wiring work good camera man great video
Thank you much!
I’m not a chopper guy, but that key is a sign. Tip of the cap.
What a great way to hide a key!!!!!!!
I really don't know what you're talking about with it being too cold; it's ride time here....well I am in Australia!! hahaha
The chopper is coming up really nicely and am waiting with baited breath for the start of both bikes now. :)
It's summer for you all! Someday I'll make it to your country.
Hello B.J. That was just the coolest find, the guy that left that key for you was a real old school cool dude!
Just the best! Cheers Kevin. Ps. Do you remember those old magnetic tin, key stash boxes you could attach under the car back in the day?
I may just have one of those boxes 😅
another great video, keep them coming!
Thank ya
KEY!!!! fantastic.
I was so excited! It was awesome to get on film but of course now I do need to switch the switches!
I saw on one of the car channels “Tavarish” I think, he cleaned up oxidised terminals by dipping the whole connector block in a bath of vinegar and salt, then washed it off with water and blew them dry, it took all the verdigris and corroded deposits off leaving the terminals looking like new, really impressive, I’ve got an old CB750 loom somewhere I’m going to dig it out and give it a try, seems a better method than we all tend to use such as wire brushes and scraping, have you ever tried that?
I have seen but not tried that. It would be worth giving it a shot though
If you put some LED headlight, tail and stop light bulbs in you will reduce the load on those skinny wires, expensive but cheaper than hours rewiring
Correct, it would help a bit
More wiring please!..I'm in the uk and re built my 1981 kz650 loom using the excellent tutorial from Taylor on Classic Octane a couple of years ago
Head to my channel page and search "wiring" and you will be very pleased 😁
Damn. I have those same stripping and crimping pliers.
Hi Taylor . Im trying to find good bullet connectors and some doubles and tripples and a quad joiners . Connectors in headlight bucket are stuffed .hopefully will stop comming apart when fitting headlight .
Cheers.
@@jamiestanley8774 Head over to cycleterminal.com for those items.
-Bj
@@BrickHouseBuildsthanks mate.
Love the ' key find' 😂😂
It made my day and then some!
Neat place to keep the spare key.
Yeah I may have to reuse that idea lol
Thanks for the video, I am thankful I dont have to contend with minus temps....ever
Very fortunate! I do like my seasons though
man I thought a k in cash or some forgotten prerolled joints, but a ignition key. wicked....
Yeah I was expecting the same lol
Man I've gotta buy me some of them electrical tools.
Ya need at least a small arsenal
😄
Always enjoy your videos 👍🏻👍🏻👍🏻🇬🇧
Glaf you enjoy them!
Nice
🤘
Hey, do you think you’d ever get your hands on an old Yamaha DT1 or RT1 that needs some work? There aren’t many in depth videos of working on those bikes and they are super cool!
I've worked on a dt1 (175) and made a couple videos. I just don't really do 2 strokes though
Nice job BJ what were the chances of finding that key lol good place to keep a spare though, and yeah cold here in Scotland also was -8 here today so pretty cold take care and all the best and I don’t mind electrical videos gives a good insight to what does what and I still haven’t got a clue hahaha 👍👌🔧🔧🔧❤️🏁🏁
It's funny you say that as a Facebook memory popped up yesterday where I said wiring was too difficult and needed NASAs number. I had to learn as well. Even now it's still not "easy"
@@BrickHouseBuilds you my friend do awesome work and I love that you are thorough in all that you do ,great stuff 👌👌👍
Key in a sock, can you say Easy Rider!
100%
Now I know where to hide the spare key. For real!!!!
Its a legit great spot!
Use those smaller guage wires in the bars to trigger a bosch relay and then off to the high current devices.
Relays take up a bunch of space and is old tech compared to what I mentioned with the x21 or munit. All modern electronics is a small package
@BrickHouseBuilds well, if you're not keeping the bike, it's a viable option. And safer than what's running in the bike today.
This bikes name is officially Mittens.
Or just socks lol
Another great video.
Mate, I cannot find your other channel anywhere. Maybe you could add a link in this channel's description/about section.
Cheers
I'll work on that. Thank ya
You did it BJ! Thank you@@BrickHouseBuilds
@brucearena I appreciate you pointing that out. I revamped my entire about page along with video description format going forward
Glad to have contributed in some shape or form and I hope this revamp brings you more followers or maybe aids you with the almighty algorithm@@BrickHouseBuilds
Creating nicely crimped connectors can be so satisfying.
When it comes to handlebar levers (clutch or brake) I don't like it when they have a lot of up and down play in them. I put washers on the pivot bolts (on the bottom and/or top part of the lever) to take up that small space and make the levers feel tighter. (Not so tight that it hinders their movement.) Is that something other people do or is there a better way to solve that issue, like bending parts to create a tighter fit?
For these old ones I just make sure everything is as tight as it should be and bend the parts back into shape if needed. It will never feel like a new bike so I just live with it
Ok Ok Ok having lunch here. Now gotta stop the video and go out and check the bike for a hidden key. Oh My goodness! I guess the key for a bike is a big deal. 〰✨💥✨〰
Maybe just swap in an led h4 replacement? It won’t put nearly as much load on that wiring.
Was that a 60W bulb in there? I think you can get incandescent H4s down to 35 watts, sold for mopeds. Only marginally better than a candle though. I have a 45W one in my cb750 that seems OK for brightness.
This actually already has an H4 as evidence by me cleaning inside the bucket. An LED would be a nice reduction in current though
That's actually s normally closed switch on the clutch. With nothing actuating it, the circuit is closed.
Opposite actually. Closed refers to a loop where current flows. An open circuit is when there is no path and no flow like here.
Hi buddy
Gotta ask a stupid question, only because I didn't catch a mention of it, but did you check the kickstand switch?
These don't have one
So lucky finding that spare key, hope the sock wasn't too cheesy though, 🤮🤣.
It smelled fresh actually! I couldn't help but ask that same question
@@BrickHouseBuilds 🤣🤣
Did you check the 2&3 caps for what they're supposed to be? Sometimes the middle 2 are 10k ohm
I've never heard of different values on the inner caps. That would create a different spark output on the same coil. I did show testing all 4
Old Honda caps are always 5k. Says it right on the original caps. If they read 10k they’re no good
Noooo! Don't put any kind of lubricant between the throttle tube and the handlebar! I've made the same mistake myself. It *always* collects dust and ultimately increases friction. The plastic throttle tube is already extremely low friction against the steel handlebar. If you have some mild surface rust on the chrome, or you're worried that you will in the future, rub it down with a product like Quick-Glo.
Ive always put lubricant there and will continue to do so. Even on my ADV bike where it lives on gravel and such. If it gets dirty its simply a couple screws to disassemble, clean, and relube.
@BrickHouseBuilds "even if it gets dirty" but the lubricant isn't even required there. Again, the plastic sleeve on a metal handelbar is already extremely low friction. Just don't do it. There's literally no point in lubricating something that doesn't need lube and saying "well, I can clean it easily enough if I need to"!
Are you no longer selling the x21 or can bus digital systems? I always thought that it would be good to be able to retrofit a digital handlebar control system in to classic analog shell, so you get the modern electrics in a classic or original look.
I'm no longer a rep for them. The st-net system they have is designed to do exactly what you are asking
Very satifying snip sound from the wire cutters.
As an aside, when wiring block connectors like these I tend to put a very short section of heat shrink over the crimp. Any reason I shouldn't do this?
If they are double barrel crimps there is no need for the extra heat shrink assuming they are going into a connector. If it were standing on its own I would and do add some heat shrink
@@BrickHouseBuilds , I do it as extra insurance, as that is the one bit of the wire that is most open to the elements. Just hoping it outlasts me by even more!
Where are all the wires in your headlight bucket. Mine doesnt fit because of the wiring.
They are all in there. You have to position the wires in the right way to fit the light.
I'm looking to replace the harness/loom on a '98 Bandit 1200; (apparently it has an alternator not a stator and the electrics have left me stranded twice...)- if you have any similar projects I would be interested to see :)
I have a 99 Bandit 1200 which I have videos on. Those should be really reliable electronics so I'd be curious to see what the root issue is
@@BrickHouseBuilds I am told the aged wiring was causing increased resistance- also that a sneaky fracture had occurred in one cable- causing the main fuse to blow. The bike is in terrific shape otherwise.
@@BrickHouseBuilds Thanks for your reply, I will check out your Bandit videos.
Just a key😁🐕🦺
That soldered wire in the fuse box bypasses the ignition key..
Hmmm, I would assume if that was the goal he wouldn't have left the wiring to and from the ignition switch intact. That would put even more load through the HL on/off switch with the small wiring as well. Glad I reversed that
I don't think your reaction to the found key was adequate. Easter egg, Christmas and 4th of July!
Hahaha I was just like noooooo waaaayyyy!!!
High resistance blows fuses? I = E/R. Low resistance blows fuses. A dead short is a low resistance current flow. Low resistance cause high Amperage. It’s the law man. 😂😂.
Yeah speaking in the moment I can slip up. You get the idea
Anyone who choppered a bike is highly suspect of not knowing what he is doing, since choppering is done by people who don't know what they are doing to their handling.
Rip it all out and rewire the whole harness with aerospace grade teflon wiring and connectors and convert every light to led. Your current draw on the whole system will be roughly less than half and even an old weak alternator will be able to keep the battery in good shape. Or upgrade the alternator too, it deserves it.
I do this to all of my builds now, it sounds like a TON of work and the first time it kind of is but after that it gets much easier and you have a system that will never be taxed and will be reliable.
DISCLAIMER: BHB is a reputable builder and I have seen enough of his work to know he can make it better than original. If you do not have extensive experience with electrical you probably will not, so either hire someone to do this or do not attempt.
Edit: I know I got defensive here lol. I just have to defend what I have experienced with the 100sof bikes Ive been through and builders Ive met. Even this bike has higher than usual quality of work. I just don't want to make a statement like that one.
Incorrect. Some of the best bikes I've ever seen are choppers. That is a completely false statement.
Yes, rewiring would be nice but the first part is overly generalized
@@BrickHouseBuilds I strongly disagree, but if we all thought the same the world would be a pretty boring place. IMO choppered bikes either handle shite or have had an inordinate amount of engineering (and weight) added to get around the problem. The hundreds of bikes I have ridden and worked on, the thousands I have examined and the dozens I have built, raced, crew chief'd or consulted on over the last 40 years have led me to this conclusion. While I'm always open to evolving my position on anything, I'm not holding my breath that this will change.
But hey- this is about wiring! Lots of common ground in that area I'm sure. 😁👍
@@jameshisself9324 there is a solid pun there about electrical and finding common ground lol
@@BrickHouseBuilds Intentional but subtle. Thanks for catching the dad joke lol
Son of a bitch 😂, can't make this shit up. I like the unusual key find. More wiring videos please. 🎉
Dude I am so happy I had that moment on film! A hidden key in a sock. I 100% thought it was going to be dr$gs though lol
@@BrickHouseBuilds I thought it would be just a pair of gloves to keep warm on certain days.
It’s solder. Not solder. 😊👍
sooolllllllllllldur
Correct 👍
@@stevetee4145 so I should pronounce the L in Salmon?
Divvy
@BreatheScotland... Well hey there gang! I love that channel too
Should of gotten rid of those shit bars with the wiring
I love the bars. Sorry they upset you
Sorry to be negative. Love the builds
I was definitely expecting drugs hidden in that mitten
Thats what I was expecting 100%
Why not just make a temporary starter button? Save your leg.
Oh you can start these by hand. Very easy to kick off. Once the carbs are dialed they are 2 kick bikes
@@BrickHouseBuilds once the carbs are dialed in, yeah. That's why I suggested a temporary one while you get it there ;)
@@NotdoneyetYTI predict @brickhousebuilds will have a grand old kickin’ time at the first start-up 🤣
I'm disappointed about the electric start. if wiring and electrical are your thing .... make it work. The least you could do is clean it up, that part is a mess. Working in filth is not a good practice.Second it is a button, it ain't rocket science. The small gauge wire is an issue but most things on that side are low current anyway. IMHO if you are going to do something....do it right. Especially if you are making a video about "Fixing the Electrical". You are better than that. Just saying.....
Chill out
I explained everything you are referring to in the video very clearly 🙄