Barn Find CB750 Health Check and Tune Up!
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- Опубликовано: 5 июн 2022
- Barn Find CB750 health check and tune up! Now that the bike is up and running I am working to make sure it's sorted mechanically and getting an idea of its overall health. In this video I show the condition of the cylinders, do multiple compression checks, adjust the valves, sync the carbs, and diagnose an oil overflow issue the bike was having! I give this bike a 95 on the 100 scale for condition. For now all that's left to do are small jobs and simply enjoy the bike!
Compression figures:
Pre first start cold: 100 / 120 / 120 / 80
After 60 miles cold: 140 / 151 / 151 / 145
After valve adjustment and 75 more miles cold: 149 / 125 / 135 / 145
Warmed up figures: 165 / 160 / 165 / 167 = FANTASTIC!
Previous episode:
• Barn Find CB750 FIRST ...
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Great job in putting this legendary motorcycle back on the road, where it deserves to be. Sounds really good too. The only upgrade I might make would be dumping the points in favour of electronic. More accurate, less to go wrong and nobody sees it. Really enjoyed the whole series and look forward to other projects. Good work!
Thank you and I do agree on the electronic ignition but In my own weird way I'm having fun just having something old. I love the fact that it has its original hardware still in working order. I just had to change points in a Mustang that didn't even last 500 miles. It may very well get a new ignition but im in no rush for now.
@@BrickHouseBuilds Yep, absolutely,I totally get that. It's nice keeping everything original,,if it ain't broke.....
Just great to see it up and running.
This is SO much fun to watch. Honda’s are such legendary motorcycles that if properly maintained they can run forever. I’m telling you that if I was nearby I’d have volunteered to come help as I’m sure Many other subscribers would. Sets cover coming soon? CBX! Yeaaaa 😁👍🏻
Glad you thought it was fun! The seat will be addressed in due time. Still some mechanical bits to tackle first
Any mistakes you show are just as instructive as the rest of the video. You honestly addressed them and that may help the rest of us from making the same ones. Thanks.
I always try to show when things go wrong as you are right, they are learning opportunities!
This is Steven England Southwest England 71 years old and I watching your videos and I think you do brilliant. I don’t care about your little mistakes. I think you are ace on everything you do. Keep going to give up.
🙏🙏
Great video and in no way excessively long. I love the fact that you’re keeping the patina. It looks like a proper old bike, well ridden, maintained, but not doted on.
Well thank you and I appreciate the input on length. The patina is what tells this bikes story so I must retain it!
Was thrilled to see the follow up on this iconic SOHC. My best friend had one in the late 70's that he dearly loved and had for quite some time. Had forgotten just how sweet they sounded when they were in good tune. Thanks for sharing the trek back to bygone days.
Well I'm glad you enjoyed it Murray thank ya!
they do sound sweet don't they
Great video! You do a great job of sharing the process - sometimes fun, sometimes frustrating, always rewarding in the end. I've done quite a few vintage bike rescues (just finished up a 1979 CB750K) and it's always a good day when they're dialed in and running like they should. Looking forward to more CBX videos. Thanks for sharing!
Thanks Jon! I just like to show all thats involved with this stuff
Built like tanks and older, but not too old. There's a certain sense of excitement and unexplainable awe from bringing these great machines back from previous decades, as they are becoming the new rarity. Not too many on the road anymore. Awesome content.
Agreed and thank you much Cody!
The sound of CB is music to my ear, love it.
Agreed and thank you!
Great video! It just goes to show how tough these SOHC engines really are, and I always liked the mechanical aspect of setting the valves & cam chain, & synching the carbs(wait'll you do your CBX carbs!)to get it all dialed in and running bitchen! We all have made mistakes in the process of doing adjustments, recall lighting off my fresh 1270cc CBX engine with a lot of expensive parts in it and it was running on 4 holes, turned out to be valve clearances, reshimmed and vroom! Rocketship.
If you think it has trouble with cylinder bores, do an 836 kit on it, really wakes up these bikes. If you can find the '69-70 KO cam, that also works.
Thanks for a lot of good info in this video, and ride safe! Enjoy!
Noted and thanks Mark!
It is videos like yours that give me confidence to approach very much simpler tasks to accessorize and maintain my new NC750X. Impressed at how you diagnose your mistakes and own up to them, but this is just an aside; the real take-away is your normal patience and thorough, methodical process to get it done. Really impressed with those compression numbers. That barn find really turned out to be a gem, didn't it?! Congratulations on reviving this bike so that you can enjoy riding it.
Well that means a lot thank you
I've been working on my 1982 Honda CB750K that's been under a tarp for the past eleven years. 1st on the agenda was to empty fuel tank (left it on the bike). Used my Pennzoil fuel transfer pump. Carbs were run dry at shutdown which probably saved the carbs ! Filled tank with two quarts Marvel Mystery Oil and then topped tank with fresh fuel. Left tank sit several days. Emptied tank and filled with fresh fuel. New oil filter and oil plus new air filter. Start up time. Open fuel cocks. AMAZING.....engine fired up second crank ! Now that I know it runs it's time for cleaning, polishing, repainting miscellaneous items ( Rustoleum charcoal metallic). Currently painting with the metallic and plan to use Crystal Clear for final 2-3 coats. Next up......new levers, mirrors, hand grips, horns, headlight and headlight housing. Also adding Nilite LED lights. Should sparkle when I'm finished. JimInCincy
Sounds like a great project!
Love that bike! Congrats getting her running and riding again. I rescued a '71 CB450 myself and she is super fun to ride! Cheers
I love cb450/500T bikes! I want to make one into a legit scrambler
@@BrickHouseBuilds mine actually has a 500T motor in it! #sleeper lol I switched to electronic ignition too.
Good stuff. Love the bike. Makes me happy to see old bikes back in action on the road. Thx for saving it ;)
Thank ya Bart! I love bringing these back
Enjoying all the videos,,keep bringing that old shit back to life ,,that's my passion,old bikes and getting them to come alive
Glad you're enjoying them! I love reviving these things
Really enjoy these vids. Thanks 🙏 I like how you show your mistakes & explanations. Also, you show how to do it without a mega garage! I have learnt heaps. Cheers
Thank you much! Always happy to know the videos help
Great video as usual. Hoping to get my 71 cb350 on the road this month. Thanks for the motivation.
Get to it! Those are such fun bikes!
I guess no one has ever taken care of it as well as you ... It's great that you take care of this machine as it deserves.
What a quality of workmanship, despite the passage of years - it still impresses.
Thank you for the great material, I always look forward to the next ...
Well thank you much I appreciate it!
Most bikes get put away wet without any maintenance, and yet they are so easy to maintain
Another great CB750K video, loved it. Just found your site a couple of days ago and am trying to watch all the CB750K projects you got. Really learning a lot and hope my 2024 summer CB750K4 projects goes well too. Thanks again
Glad you enjoyed! I always send people to this video when they have questions about the engine on the 750
I have a couple of 1976 Honda CB750s in my garage. Your excellent videos have inspired me to get those old Hondas running!
Definitely get them going! Best luck on that!
Hi BJ, another great vid. Thanks for sharing your time, and expertise with all your followers. Your channel is my favorite, your care, and precise methods are inspirational. Respect.
Thank you! I always refer people to this video when they ask about the engine after I unseized it
I really like process of troubleshooting you do. You show what you are thinking almost like a science project testing theories. Some work out and others not so much. Its just part of the process of learning. Well done!
Thats really the way I like to do it. Show problem solving in real time
Thanks for requesting this video. Yes it did answer all my questions.
Thank you for this series of Honda clips. I especially like that you share thought, theory's and tests even ones that not go so well. We all do them you just do them especially well.🙂
Thanks so much! I always show were I goof up lol
Totally love your videos. This one tugs my heart strings. I am a 69 year old Aussie, and I bought a brand new CB 750K2 in 1973 when I was 18 years old. I rode a lot of miles on it. From Mildura Victoria to Cairns Queensland when I was 19 (Google that, it was a long ride) plus heaps more. That Bike was like my first love. I am now an old man but still own 6 Motorbikes. Four BMW’s, one Triumph and my most recent purchase is a K8 Suzuki Bandit 1250 that I am having an absolute blast on riding Twisty roads. Keep up the great entertainment with your videos and you will keep this old man happy.
Glad it brings some good memories!
love it - I grew up in the 70's - 80's riding bikes like that - crap brakes - naff suspension - skinny tires - loads lowdown grunt- you had to ride them hard and stay alert or you were in a hedge. l am so happy that you are not going to chop it up - upgrade things past what might have been about in the day. I hope you enjoy riding it as these are going to be a thing of the past if they get their way
Thanks Bert. I sure hope "they" don't as I love my vehicles that run on recycled dinosaurs
I had a black 1978 Honda 750 F2 with a Kerker for years. Road it all over Washington/Oregon/Idaho. What an amazing bike. All these sounds remind me of that bike. Also, how the carb balancing would really smooth it out.
Nothing else sounds like a SOHC 750 thats for sure
That is great news that you going to keep the bike! Glad you found the problem and now you can enjoy the rides in the future..
Ive sold too many and worked on too many customer 750s to let this one go. It's definitely staying!
I enjoyed this video and am happy to see you putting this bike back on the road after so long! Nice job!
I appreciate it and glad you enjoyed it!
Sweet bike. Love those kick starts.
Thanks Ric!
Super job! Very well done! I love the bike; this is what's its all about! Regards from Canada 🇨🇦
Thank you much Keith!
A small school day error helps people like me very good to watch you breath life back into it hope one day to have a cb750 project bike so your videos will help me 👍👍
Thanks Andrew! Just showing that it's real!
No trolling, just enjoyment. Thanks for these videos.
Glad you enjoyed!
finding your show on here is awesome. I just recently found (for FREE) a nearly complete original 1976 CB750a Hondamatic. I want to get it running and this stuff is going to help with everything. thanks for sharing your knowledge with us dummies.
Well I'm glad you have enjoyed the videos!
Excellent informative great video for any one interested in motorcycles you know your stuff young man thanks for passing it on from Ireland.
Thank you much!
I live in farm country too. Last week i came over the crest of a 2 lane , and started downhill @ 65 mph and came upon the very same type of farm equipment in my lane. I thought the same thing, to just go under it ! :)
Hahaha its tempting!
Big pat on the back, BJ. You’ve done a great job getting this bike back on the road. It’s a real survivor! ❤️ If you ever want to get rid of it… 😆
Haha thanks John! I'm planning to make a budget video for the bike and I'm going to get hammered with offers to buy it but the answer will be a resounding "not for sale" as I must keep this one. I enjoy the experience of this bike more than some money
Nice job on this bike, I had a '78 F2 version from new, never let me down.
Thank you! Yea treat these right and they go forever
Great demo, right attitude fix and move foward.
🤘🤘
Thanks for including your mistakes. We all do it. We've all put stuff back together to have to undo it and redo. It's not just rookies 🤣. This is a great bike and a great series of videos. Appreciate the work on the bike and the work on the video production.
Hahaha thanks Anthony! Definitely have to show those goof ups
So satisfying to watch this love story 💕. Nice work man ! You got me wanting one now, thanks. 😆
They are addictive!
@@BrickHouseBuilds my dad's was actually the super sport. Now I'm looking for one.
Great video. I enjoyed this from start to finish.
Thank you and glad to hear it Case!
Hello there. Really enjoyed seeing and also hearing this bike. A flight down memory lane for me, honestly it sounds sweet nothing else like it a seventies model.
I have a CB125S manufactured 72-registered 73 in the U.K.
they certainly have something special, or is it just me?
I would just fit a seat cover and keep the clean but worn patina, she’s a good looking mature lady, beautiful.
Thanks Kevin.
Definitely something special indeed. Glad you liked it Kevin
sounds awesome mate well done
Thanks Paul!
Quando tive minha primeira moto em 1974 uma Honda cb50 ficava namorando as motos maiores na revenda Honda aqui da minha cidade , e está CB750 nesta cor era uma delas.
Great work my man!
Thank ya!
A really great job, so interesting, well done.
Thank you!
Thanks loved every minute of this project and l want more, l look forward to the next. Thanks , man.😎
Well I'm glad you like it Craig!
Well done , bike looks lovely as it is
I think so too. I don't want to change much. I just want to let it be
What a beautiful example of a 750/4. The colour is my favourite, too.
Thank you! I very much love planet blue as well
Fantastic job
Thank you!
I wish I had a guy like you local to me , with such a wealth of knowledge on these old classic Honda's I am based in the Midlands in the United Kingdom .And I loved my Honda back in the day 1976 Thank you again for some very informative videos. Trev mac
A great piece of history.
Definitely an iconic bike
congrats! was a pleasant video. keep running it!
Glad you enjoyed it!
Awesome job on this absolute love it 👍👌🔧🔧🔧
🙏🙏
Your are going to love your bike. I had a first generation 1970 cb 750 and it screamed never broke down no oil leaks, no vibrations. Toured the east coast on it very minimal rider fatigue my riding buddies on their Harleys, triumphs and 750 Kawasaki were crying let’s stop saying I can’t feel my ass or feet. I just laughed saying next exit, next exit, we will stop. I could drive much farther on a tank of fuel also you should have a reservoir bout a gallon.
Oh I never want to stop riding this thing!
I enjoyed watching this
Im glad you enjoyed it!
Thank you for a good job you done on the the Honda cub
🙏🙏
I learned in this video what those round discs are for on top of the engine.
Derp.
Though, I need to remove the cover in any case to replace the gasket.
Unfortunately if you have a soch cb750 you need to remove the engine to even remove the valve cover
me too
Great video... one correction though... always adjust the cam chain first ... then the valves and then then the points.
Really nice video, I had a couple Ks and a F, miss them all.
Glad you enjoyed!
Very Sick! I got a cb750 running this summer and I've hit a few hiccups but hoping I can keep this thing going
It's usually something simple so just take your time and sort it out! Enjoy it!
Another hack to consider is lowering the ass end replace stock tire with a hog tire and rim you’ll have to replace the swing arm to accommodate the tire and rim. It gets rid of the large space between the tire and fender. While you are at it upgrade your sprockets and chain gives you better low end performance. Replace the exhaust with a high performance header or go back to stock if you can find any. Preferably from 1970- 750 cause you can remove the baffles at the end of the exhaust pipe leaving an unobstructed exhaust pipe, makes the bike sound like a formula car. Due to emission requirements Honda started putting two and three baffles in the exhaust pipes after 1970 reducing the performance drastically
there’s only one baffle in the 1970s and it can easily be removed from the exhaust. I also trimmed the back fender 3or4 inches also the front fender at the top and bottom. I replaced handle bars with 4 inch pull back bars. Also found when I ran champion brand spark plugs the bikes performance was very improved over the factory NGK plugs however the champions didn’t last as long so I always carried a new set of plugs with me. Enjoy your bike it will give you great pleasure and reliability for years to come.
Just keep watching haha. Many videos ahead of this one
Nice. Love the old CB750's
Same here!
Always wanted one of those !
Great bike, great video, really enjoyed that, looking forward to more 👍👍👍👍👍👍👍👍👍👍
Glad ya liked it Pete!
Nice work...by the way had a CX for 6 years..rode that all weathers everyday to and from work here in the UK
Thank you! CXs are tough to kill once sorted
Such a sweet ride man!
Thank ya sir! I love that CB360 of yours!
Sounds better everytime you run it. It is always cool to resurrect a nice machine like that. I would run the SeaFoam in fuel and oil. I also like Marvel Mystery Oil for same purpose.
Agreed, I have some in both
LETS FREAKING GO! So hype for this vid.
👏👏 Im pumped this thing is super solid!
Thanks for the vid.
Glad you liked it!
I love your work. You are just like me, just doing something wrong and then do it the right way. Once abaout 15 years ago i disassembled my Honda CBX, 1980 years model. I did put everything apart and i mean everything. It took me 4 months to put it togehter again. Invited my friends for the start up off this 6 cyl machine and brag about my capability as a mechanic. My EGO took a real blow (a needed one). No power in the bike, catastrophy everone looked at me and start laughing. My at the time girlfriend took the party to the barbeque in the back and i started to do some thinking WHAT DID I DO WRONG. After a approx 30 minutes i noticed a kabel from the battery box was cut of. Due to not have adjustable stand to level the bike during the reassembling i simply cut all wires from the battery right off with the front assambly point to the frame under the tank. DON´T USE A JACK WHITOUT LOOKING. Bye the way we had a beautiful holliday in Norway that summer. Love from Sweden
Thank you! Definitely better to show the mistakes so others can learn
beautifull bike and súper video, many thanks and congrats !!!!
Thank you Jorge!
Awesome video keep em coming
Thanks!
The cam chain alternately has tension on the front and rear runs once per turn of the crank, i.e for 180° each, as valves go over-centre and pull the chain in each direction - you need to make sure you lock the tensioner when the rear run is slack, easily visible if you watch the plunger (a mm or two) as you turn the crank. It's not catastrophic to get it wrong, but the chain will audibly rattle more if you do. I ran a 750F1 back in the 80's and for a while was puzzled why I could hear it after some of my service/tune-ups. BTW, I had no side panels on mine so I could reach down and feel the temperature of oil in the tank and was shocked to find the bike was massively over-cooling in the rain from the spray from the front tyre (barely warm to my bare hand, maybe 45°C / *115°F* ETA >> corrected to F/Fahrenheit), so in the winter (in the UK) I made a simple shield from a sheet of aluminium to cover the crank case (attached with six zip-ties to the frame rails so easily removed for filter changes).
The chain is adjusted correctly
Good on you, admitting mistakes. You could have edited that out but chose to keep it in. Great stuff.
Re over flow hose, could you fit a small catch bottle zip tied out the way?
You will find I always try to show where I goof up. I've ridden more since this video and not a drop to be seen so I'll soon reroute it back behind the engine.
I have a 1985 gpz600 that was seized and I got it free. Compression is 90, 91,110, 125 across the 4 cylinders. Hoping those numbers bump up like yours did when I get it running
Id say they definitely could!
The engine is quite dirty, might want to change the oil a little sooner and change the filter more. You did a awesome job getting the bike back on the road. Ride safe.
Glad you enjoyed
Agora sim... o motor melhorou 85%...
O barulho que aparece no vídeo é da CORRENTE DE COMANDO. Você fez o ajuste e não melhorou, pois a moto provavelmente foi muito usada e o proprietário não sabia fazer as manutenções periódicas.
Existem duas formas de trocar a corrente...
Uma e abrindo todo o motor e a outra é utilizando uma ferramenta que tira um pino do elo da corrente, tanto da corrente nova como o da velha, emenda a nova na velha, gire o motor e quando a nova corrente aparecer, retire o pino e a corrente velha, coloque o pino novo, rebate a cabeça do pino e pronto, está instalada uma corrente de comando nova, sem precisar abrir o motor todo.
No restante, mantenha a originalidade. A moto é antiga e deve apresentar as "cicatrizes da vida" nela.
Abraço
I just ride it. Over 3000 miles on it now. It's fine
Love your vids man! You inspire me to get my 79 gs850 done! Could you do a video on your motorcycle stand please, thanks!
Thanks Evan! My stand is like many others you will find but I did fit a Condor wheel chock up front to make everything easier. Best mod ever. I use these chocks in my van too
Nice rescue! My last one was a 73 H-2 750 Kawasaki. It took me six years to finish and sell it (there's no sense of having 2 )
Thank ya!
The seat you can do a hack that looks sweet while keeping it stock and cheap. Remove the seat cover, remove some of the foam padding only where the driver sits leaving the passenger padding, put the cover
back on, in your case you will have to replace the seat cover no big deal. It almost looked custom plus it lowers how you sit, gives lower center of gravity bit easier handling. The bike is a little top heavy at slow speeds
You will see more on the seat as you move forward in the playlist
Ya decía yo pero q bien trabajo en serio hace falta genios acá en Perú 😁
Excelente dedicación y saber lo qué se está por cambiar 👍👍👍👏👏🇦🇷🇦🇷
Thank you! I had fun doing all the tests on this bike
Awesome...!
Lovely bikes these.
Agreed!
Very educational. Like that you show your mistakes as well. Helps alot when trying to learn this stuff.
Any idea why a 82 cb900 bol d'or cant maintain power when on low idle? I have to turn it up untill it's going on its own then down again. Maybe not getting enough air?
Thank you and I always show what I do wrong. Both of us get to learn. For the idle that sounds like a few carb tweaks. A sync is usually the go-to and then mixture adjustments.
@@BrickHouseBuilds Alright thanks
Johndeere Sprayer, digging 750 project. 🤘
Thank ya!
Great job, time to treat the cb to a new oem looking seat cover.
Not getting a new cover. As mentioned many times I want to retain the patina so a new cover will look out of place. I'll get to it eventually but it doesn't bother me now. Id rather continue to sort the mechanicals
About the cam chain tensioner adjustment: That plunger is almost never free. It is spring-loaded and should move in taking up the slack if you loosen the bolt. But most often it doesn't. What I do is put a stubby screwdriver into the back end of the plunger. You can feel whether it moves then. For good measure, I hold that stubby against the plunger while rotating the crank back and forth. Rotating backward puts the tension on the slack side, driving the plunger out. If it still doesn't move, undo the 3 bolts and remove it altogether and fix it. If it does move freely, rotate forward again till all the tension is on the front side of the chain, and then without pushing the plunger with the stubby, tighten the plunger bolt.
I do feel it didn't move and will likely go back to try again. I'll likely just remove it to rebuild and inspect but good call on it regardless
I had exact bike . Bought new with vetter fairing . Long story. First bike I had , good bike , wrecked twice due to inexperience
How long did you own it for?
@@BrickHouseBuilds 3 yrs
Good video. I love the SOHC CB750. Thanks for sharing.
Thank ya Tyler!
great video, although I have a DOHC it's very good info that applies. thanks very much and keep it up.
Thank you!
In the past month I bought a 1982 Gs750t. The guy that had it was not mechanically inclined so oil everywhere and spark plugs not tight and float bowl loose and leaking 😂😂😂 so I have been busy cleaning and maintaining so far..
Sounds like a good project and potentially epic rider without too much trouble
I had similar mishap on my CX doing my valves. I tested compression after re assembly and loosely set the valves.. and forgot to tighten it more. it started for a second and then they loosened up. I re adjusted one side on the wrong stroke and did I ever chase my tail LOL
It happens to the best of us! I was too excited to go ride!
you are a legend
🙏🙏
Nice One Big Smile.
Thank ya!
I wish you growing fast ❤️❤️
I appreciate it 🙏
F the trolls, you could of easily edited out your mistake but instead you showed us and owned it. Awesome video. Thanks for sharing.
I appreciate it Logan!
Hey, awesome content! I have a questions, what kind of generic grease do you use for your wheel bearings and other common moving bearings? Does it really matter, or should I be using waterproof heat resistant stuff? Thanks for all your help!
Thank you! I mostly use basic red wheel bearing grease on the majority of stuff. Your service manual will state if it recommends a more specific grease. Waterproof grease is nice to have around as well as a high quality moly paste
What a sweet bike. I would so restore that thing back to original . Love it😀
Thank you but arguably this is an original as it gets!
@@BrickHouseBuilds no I mean I would put a four into four exhaust on it and repaint it back to factory specs. Not original I guess, but Im a sucker for mint condition 70s hondas