Fixing a DEADLY Issue On A CB750! Monoshock Mount Failure!
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- Опубліковано 14 лют 2021
- This CB750 was brought into the shop for some work and I discovered a very deadly issue on the rear suspension mounts. This bike was previously modified and the upper monoshock mount was TEARING apart! This would have caused a crash which can be fatal. This issue was due to poor design and fabrication skills which could have seriously inured someone. I redesigned the upper shock mount to a much more safe version and the bike is far more safe now.
Ill likely show a bit more on this project but simply couldn't not show this issue. Be sure to look for stuff like this when buying custom motorcycles.
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Intro Song: Take It Easy - Bad Snacks
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NICE JOB, I AM GLAD YOU TAKE THE TIME TO EXPLAIN WHAT YOUR DOING FOR YOUR VIEWERS.
Thank you! I always try to make sure what I do is very clear and why I'm doing it that way.
I'm watching this video 3 years later, man that welding is something else !
Thank ya! Luckily safety doesn't go out of style
You are a man that will help save lives. You are a true pro, never stop learning and I hope you do not work too much and get a lot of rides in!
Thank you much! Definitely need to ride more so thats a good idea
It looks, great man. Plenty strong now. You know,... I am new to doing all this as well but I always try to get ideas from people like yourself before doing anything. Thank you for showing us how you think thru issues so I can learn.
Well I appreciate that Shawn!
Incredible solution to a major disaster. Your craftsmanship is top notch. Thanks for sharing.
Thanks so much!
That original welding is what is known widely as a bodge job. Your replacement is a piece of art, as is your welding! It’s great to see your attention to detail and obviously to safety and what price can you put on that?! The future owner(s) of this bike will probably never know what went into making it a reliable and safe machine. Well done… 👏👏👏👏
Thank you John! For price I really did my best to help this customer out with all the bike needed. Safety was the most important thing
Top notch solution and welding job! Two big thumbs up.
Much appreciated!
Lovey job and welds. That looks strong now. thanks, Gus
Thank you much Gus!
Wow crazy find. Unbelievable how some 'home jobs' are done so badly.
@@diggerloader yeah this was a scary one
Very nice work! Safety first!
I sure do appreciate your integrity.
I know how it is to be underbid, cheaper ain’t always gooder
This is a very useful information.
This is the type of information which makes a lot of difference.
Glad you found it useful!
Thank you for taking the time to show us and explain what you were doing. If I may, would it be possible to ask for videos of the actual fabrication of plates, how you measures and cut the box sections, maybe in future builds please?
Thank you for that feedback. Check out my GL650 shock video and I talk about why I designed my linkage tabs the way I did. I also showed cutting them. On this project I actually made a new tool and used these tabs as a trial run for said tool. I can try to show more of the making process and possibly less welding footage lol
@@BrickHouseBuilds thank you for taking the time out of your busy life to reply. As a new welding and fabrication apprentice, I find your videos very interesting. I’ll of course check out your other videos. All the best!
Nice fab work, over built is always better than broken on first ride. I have an old CB in the basement I am gonna mod at some point, and I was thinking of a mono shock build, so this gives me a nice idea for a solid top mount.
Thanks Craig, I agree on the overbuilt part for sure!
Nice repair. I'm sure we've all made mistakes as we learn how to do this stuff. I know I'm bound to make more as I try new things. I'm just glad you caught this one before it became a liability. Keep up the great work and thanks for taking time to do videos.
Yea I'm definitely not going to act like I did everything to my current levels when I was learning. As I mentioned though you need to know when to ask for help so nobody gets injured!
@@BrickHouseBuilds I hear ya. There are lots of knowledgeable people who are happy to share their experiences and skills if someone just asks. Keep up the good work man.
@@builtnotboughtbybruce thank ya and will do!
Npw that is a real nice solid & clean repair. It's shocking how some folks do certain things. Your rant was 100% warranted!! 😉👍
1.5 rants lol
@@BrickHouseBuilds 😡🤬🔥🤣🤣🤣
Beautiful welding work. You have skills, my man.
Thank you sir!
I totally understand your rant. No need to apologize. I appreciate your attention to details. I am starting to build an '81 CB900f and I too want to go mono shock. So your idea compliments the idea I have as well. Good stuff. Nice work. All the best.
It was a much deserved rant haha. Best of luck with the 900 build! What swingarm setup are you thinking about?
@@BrickHouseBuilds VFR 750/800 if not, I'll settle for an old CBR box style.
@@danadane8143 very cool! I actually have an upcoming CB750K build with a vfr sssa!
@@BrickHouseBuilds Oh really, That's cool. I'll tune in to see you tackle it. I've measured a VFR SSS, the pivot sleeve/tube is a little wider than the ID of the frame where the swingarm will mount. I haven't bought the swingarm yet, but I'll either have to cut down the swingarm pivot tube or mod the frame or a little of both. The critical is keeping it centered. I've also heard a Ducati SSS will fit with less mod, but I'd like to keep all Honda.
Man, that beautiful weld !!! I've only seen it in my country if you went to the expensive shops. Awesome job man!!
Thank you much!
@@BrickHouseBuilds No problem man, your contents is quite entertaining as well :D
Great job man. Amazing work
Thank you Anthony!
That's some good fab work! It's definitely up to the job now.
Thank you much!
Good job, nice work!!!! SAFETY first!
I appreciate it! The original builder thought safety never lol
Great video and top notch fix. What did the customer have to say about that mess?
He was definitely frustrated to see the previous work but happy that I made it safe
Great repair and much safer now. 👍🏼
Thank you. Definitely more structurally sound lol
Thats not fabrication..its a work of art...TOP job..
Many thanks 🙏🙏
Looking nice now!
Yeah I feel much better about it
Nice work and strong as.
Thank ya thank ya! Overbuilt better than underbuilt!
Great job, some people really need to learn what the limit to their skills are
I think learning that it's ok to ask for help is a big step. There are many many things I cant do and need a hand on. I lean on more knowledgeable people when I can and wish this person would have done the same.
@@BrickHouseBuilds definitely asking for help is always the best way, and why risk your health over not asking for that help
Hello B.J.
I enjoyed watching the video, just my cup of tea, playing around with metal etc.
Let’s hope whoever did the original modification doesn’t work in the aero industry!
(I think you may have to put some money in the swear box though!)
I understand your feelings regarding the “botch.” It’s a poor advertisement for the trade, as people think others guilty by association. Bad news indeed.
Over the years I’ve seen many such repairs, just when you think you’ve seen it all!
Keep up the great work,
Thanks again Kevin.
Thanks Kevin, not going to hold back on something like this though so no apologies from me. Serious situation that could have been deadly
@@BrickHouseBuilds I hear what you are saying. The great thing is, you showed a positive way of repairing it, and also the thought process, taking time to explain it well. Good all round B.J.
Keep up the great videos! Thank you from the other side of the pond! Regards Kevin.
Your the man! Look at that. So neat and strong
Thank ya Phil! Fixing this helps me sleep at night.
Nice job!! Greetings from Finland.
Thank you!
Overkill, is definitely better than under..., when it comes to Safety.. Good Vid Man.
Agreed and thank you much Jason!
Badass top mount. You saved his life.
Thanks Mitch! I definitely feel better knowing I made it safe
Saved someone's life right there, job well done
I may have. It was really bad
Love your films, I'm hoping to do a build nothing grand like yours.
Great catch and nice replacement mount! Welds look great too.
(The word “height” ends with a “t” sound not a “th”. Maybe nitpicking but UA-cam is rampant with people saying “heighth” for some reason.).
I'll make sure to keep with the th just to irk ya ;)
The music/vid sync at 12:05!! 👌🏻
Thats when the editing is fun!
You have to be careful buying a project done by others. I bought a largely finished project and had to fix literally everything the other person had touched, everything was done wrong or badly and every single bolt was so over tightened I had to change most of them.
Definitely, I had actually seen this bike for sale and saw there were some potentially questionable methods on it. I later saw the new owner reaching out on local facebook pages for anyone to help him with it and I contacted him right away. Glad I did
"OK, the rant's not over" ... "Another thing is..." hahahaha, I was dying of laughter.
🤣🤣🤣 I was heated. This is life or death stuff
@@BrickHouseBuilds Oh I get it... and I don't blame you. Besides, I was laughing with you, not at you ;-)
👍🏻🏍👍🏻🏍👍🏻 this is done much better than Factory built 👍🏻
I appreciate that Klaus!
Great work, thanks for sharing. How many hours total did it take ?
Good question, I'd say 6-7 hours if I did it all at once. Hardest part was removing material cleanly near the frame joint and welding it in weird positions
Damn man... That's pretty scary. A monoshock conversion is no freaking joke man. I have build several bikes. Fully rebuilt a fair few motors. I can weld and wrench OK. No way in HELL do I feel comfortable doing a full mono conversion on a bike. That is a point of failure that is basically instant death or critical care if it fails while moving over 20mph. Some people are out of their minds. I Really want to do a mono build. But I have been waiting several years to find a good donor bike that was factory built with a mono for my build. And I will continue to wait.
Yea its a critical piece to get right and it's just crazy how some people will let it be like what I started with on here. Life or death
That's an amazing job! I'm not sure to understand when you talked about ride height at 9:25 . How do you setup your bike on your working bench to play with the height of the bike? Do you explain that in a other video? Thanks, loving your channel!
I appreciate it! For the ride height just think about where the shock mounts are. The lower the top mount is, the higher the rear of the bike will be as it will compress the same. I do have a cx500 video where I remounted the rear shock to address a ride height change.
@@BrickHouseBuilds thanks! I will check your cx500 monoshock conversion again and take notes!
ua-cam.com/video/cv5XWw-m4Zo/v-deo.html
As usual you've brought a mess back to safe and a sweet looking project. I hope you doubled the price on this abortion, he's lucky to have you to repair it properly. SWEET job kid.
Thanks Mike, for some reason older comments pop up that I haven't seen before so sorry for the late response lol
amazing work bud. I thought you're one of those cast from the walking dead 😂
I'm no mechanical engineer and custom building my first subframe, but.... If anything it will need a heavier spring from the over building and heavy guage metal. Same in UK someone can chop, cut and weld then get an MOT as long as the brakes and lights work then kill someone. There seems to be a trend with "novices" doing bike builds too. Actually makes me want to do another custom build and even without finesse and show bike skills, start another channel just to show it can be done but safely. Anyway, I understand your rant and respect you even more knowing you look after people with pricing considering your skill level you could charge whatever you want. Anyway, mine is coming along it's got an exhaust mounted, new ignition barrel, air intake sorted and about to cover it with some cheap mesh... I just want the fab work done as its all starting to flash rust but the big issue I'm facing now is all the flux core slag in tight spots I can't fully chip off, I'd wager it will react with primer and cause a ton of issues later but with an almost zero budget we shall just have to wait and see!
With this specific swingarm and shock setup the stock spring rate is fine as its set up nearly the same between the bikes. On non linkage type setups like on many cx500 builds you do need a heavy spring. I've demonstrated this on various builds as well.
@@BrickHouseBuilds sorry sorry, I was referring to mine needing the heavier spring rate after the over engineering. I was trying to prove your point and worded it poorly
@@akanonymoss lol no worries
How thick were the tabs for the upper shock that were on it. Looks like thinner than 1/8 but hard to tell from the vid.
I think Bounty 2 ply 😅
Nice work geez
Thank you sir!
Honda Hornet and...job done! Just razzin'
Great video. I just picked up an 81 CB650. Do you think the factory swingarm on that could handle a monoshock? Even though it wasn't designed for it.
Thank you. You may check out this video I made on using that style swingarm for a monoshock ua-cam.com/video/CVfpLf__tls/v-deo.html
@@BrickHouseBuilds I just watched that! I was trying to avoid that because I like the other look better but I don't want to replace the swing arm so I might just stick with the hoop support system you made. Thanks
@@lindenaho If you prefer the other style I'd recommend a brace or different swingarm entirely. Check out my white cx500 build for a non-linkage style monoshock setup. Its braced how you may like
Yeah, my 650 swingarm looks beefier than the one in the linkage video. But I don't want to take the chance
Luckily the owner brought the bike in. That thing was a death trap. Imagine going 60mph when that shock finally gives way? Ouch. I'm not huge fan of doing a mono shock conversion on a vintage bike.
It was a literal death trap from sure.
“rants over .... okay rants not over”
😅😅 I was heated lol
I have an issue with the lower mount, one of the bolts is not aligned correctly, so is it possible for me to alter it to adjust it? And also the bracket is also bent... Should i just change the hole monoshock or i can get a bracket thats suitable?
Thats impossible for me to answer as I have no idea what you are working on and can't be there in person to see
Some people just shouldn’t be allowed to work on stuff......anything. Clearly no basic engineering skills. Great save!
The current owner is definitely happy I spent the time to make it right. The bike has much potential and that single item would have ruined it all
Yup. Been there done that. Love fixing others so called Pro work.
It was pathetic man. Just deadly.
5:23 you can have two out of three.
Fast Cheap & Good
If you want Good & Fast it won’t be cheap.
If you want cheap and good it won’t be fast.
I use that often. Definitely solid advice
you have every right to be pissed about this!!
Sweet hat!
I wear it a lot!!
I'm curious on how easy that swingarm swap was
Based on the forum threads it is a very popular option. I don't want to say direct fit but it may be close.
That was a pretty clueless construction. Maybe the original designer does not understand the lever concept. Typically the weight on the rear axle is three or four hundred pounds. But the swingarm acts as lever on the monoshock mounting point multiplying this by the ratio of swingarm pivot-to-axle over the swingarm pivot-to-monoshock, and this is large like a factor of 5 or so. So there's a couple of THOUSAND pounds force on the upper pivot.
I doubt the original "designer" never got close to thinking that deeply on it lol. It really was horrible
That’s how to do it properly 👍
Thank you Martyn! Do it right or not at all!
would have been pretty shocking for the driver to hit a heavy bump and take a shock tower to the ballbag. At first, I was going to respond that we aren't all welding pros with thousands worth of welding gear in a shop to be able to do things perfectly, but after seeing what you're talking about..... a 10th grader that's taken a semester of shop class would know better than to do that. Especially when a broken mount there would be perilous to his beans and frank.
Yeah it was not acceptable from even a beginning standpoint.
My feeling is if you're not going to do it right then don't do it at all
I understand we all have different skill sets but some things must be done to a professional level for safety reasons like this.
Somebody ruined a good motorcycle. Those builds are more often than not utter garbage and make the bike worse in every aspect.
Seemed to be pretty awesome after I got done with it
So what, get your torch or whatever and cut the thing out of there. How do you know it was done by another shop? I'd say it wasn't done by a shop but by the person that owned the bike at the time. No way would any shop that I know of that would let shoddy work like that out the door just in terms of how hack it was done. I have over the years had and modified then sold a number of hack jobs that I knew were very poorly done and the people that bought them bikes also knew what the deal was with each of them because them hacked mods were usually the reason i was selling those bikes in the first place. Then say one of my old hack jobs makes it into your shop and you see it and start bitching about it like you are on to something. Just saying. Oh yea I am not a "shop" by any means im just a dude that has a lot of tools in my garage. I never take on anybody's bike or car for any custom type stuff like that for the sole reason being that i lack that attention to detail for lack of a better term to satisfy any said customer. In short, I'd have people coming back at me bitching, kind of like you were in the beginning of your video . Again, just saying. but am i getting better....not at all. I suffer from instant gratification and need it done now so i can ride, now! and for one last time....just saying
Im not really sure where you are going with your comment as its very confusing but...
- Customer brought me the bike to work on
- I noticed the deadly shock mount and said it had to be repaired
- I repaired it and now it's safe to ride
I dont think I said a shop did the work I just know other shops refused to work on the bike. If I see dangerous work I will point it out and shame those who did it. A person's life is more important than not pointing out poor work done by somebody in order to be a lesson