I made a Carb Cleaning Video that's fun? 1979 Honda CB750F DOHC

We're kicking off a new project by starting with one of the most annoying projects - CARBS! They are for a 1979 Honda CB750F Supersport that we've nicknamed 'The SportBobCruiser' It's missing a lot of parts, but to start, we want to hear the motor run before going any further on this project. That means cleaning carbs that haven't been apart in years.

Thing is, few people want to watch carbs getting rebuilt, not even the guy doing the work, so we try and make this video interesting. It is meant to show some of the trickier parts of the process and should be used with the PDF linked below.

Want to see more of the Custom BMW R90/6 Project? Check out the playlist here:

[vcamps]

Sooo what's going on with the bike now?

[stancoleshill]

Bought a 1979 Honda CB 750K two years ago. Running not too well but enough to get it home. Seven degrees Celcius. Poor idle but good acceleration. Took the carbs off, cleaned them out as best I could without disassembling them all. Put them back on, bike ran like crap. Took the carbs off again and cleaned them again, put them back on, bike ran like crap. Cleaned out the gas tank and cleaned the carbs one more time, WITHOUT REMOVING THEM FROM THE BIKE. Replaced the ignition wires and spark plugs. Now she pulls 9500 RPM, and idles at 900 or lower. The carbs can actually be cleaned quite thoroughly without removing them from the machine. Did it, was successful and have owned 12 motorcycles over 51 years

[Onewheelordeal]

I'm rebuilding a set of carbs for an 82 CB750 that unfortunately arrived to me already 100% disassembled.
Trying to figure out all the throttle/choke shafts and linkage between the middle 2 carbs has been a spring loaded nightmare.

Just a few screen shots from this vid totally solved the one part I couldn't figure out because it appears my tabs were bent out of position.

Months later this gem is still helping folks, thanks again!!!

[dylanbarber]

Thanks so much for making this. Ive cleaned so many carbs in my life but have lost motivation for 4 cylinders and you brought it back. I have a 1979 CB750K that has everything it came off the showroom floor with. Cleaning the carbs right now and trying to get it running by the end of this month for the Woodward Dream Cruise here in the motor city

[kilogixeri]

I literally bought for me -80 cb750 3 days a go, and today opened carbs first time! Thanks for vid, (instant sub) and I will stay tuned for more vids to come:)

[SwedenAirhead]

This helped me alot.
Quick enough to not loose focus and instructive enough for me to reassembly all the springs and orings
Thanks for the vid

[stewartsmotorcycles.]

A good video and an excellent PDF, as it contains the correct way to do all the things that most people get wrong. (Like getting the mixture screw O ring and washer the wrong way round for one).
The detail on how to get choke mechanism assembled and that annoying choke spring in correctly is another point that's very clearly written.
The only thing I would say is that it's a good idea to grind or file the tips of the choke flap retaining screws off before removing the screws. I've seen many of these carbs where one or more of the screws has been peened over excessively at the factory, and would almost certainly strip the thread in the mounting bar if removal was attempted without grinding the tip off. In the past I've had to fit M3 helicoils to these and it's a 'fiddle' one can do without.

I've just built a set of these for a 1981 750KZ from the original carbs which had been partly buggered up by someone who didn't know what he was doing, and a secondhand set my customer purchased. Why there are so many differences between carbs beats me. The original carbs had adjustable floats and fixed pilot jets, and the used set had fixed floats and removable pilot jets. I used the adjustable floats in the new bodies with the removable pilot jets. Worked like a charm.


All the best.

[ClassicRider]

Excellent I have a 1979, and an 81 DOHC CB 750 - originals - not chopped - I have rebuilt carbs and will enjoy your vid - thanks for making it !

[motorin]

Thanks for the PDF file, & the clear images on it. My small choke spring jumped off of the carburetor 1-2 rod & I didn't see where it was attached. So I put 1/2 & 3/4 carburetors back together & rewound the small spring after all was said & done.

[bernardgrobbelaar]

Your video is excellent. But the detailed PDF is out of this world. Thanks so much for sharing this content. 👌🏻👌🏻

[fernandomariomazzei]

Hola brother, te escribo desde Argentina. Muy buen video, yo tuve una Honda CB 650Custom 1980. Felicitaciones pir la descrpción y explicacion.

[JackSquat]

I am going to clean the carbs for my 77 CB750F SS. I think i will also take smart photo's of everything when disassembling just as a backup. It looks like it can get kinda complicated.

[toyetoyetoye]

Great video! Exactly what I was looking for, especially that little washer on the fuel screw! Getting ready to tackle the re-linking

[Ravenwraithstudios]

dude, this video saved me and my project. you easily earned the sub

[kevinrockwell]

Just discovered your channel. For this genre, you are the best, hands down.

[austinbeaver]

Best video I've seen on cleaning these carbs. Thanks!

[amw]

I picked up a 1982 nighthawk cb750sc with the same carbs as the bike in this video. It had been "sitting in storage for 10 years" but only has 13, 680 miles on the odometer. I spent so much time meticulously tearing down, cleaning, and reassembling these carbs. Put the rack back on the bike and synced the carbs. Took the bike for a ride around the block, parked in the driveway, shut it off, and all 4 carbs immediately start flooding. My joy turned immediately to frustration. 4 new floats, needles, and pins are ordered but I'm not looking forward to pulling the carbs, replacing the parts, and syncing them again. I've had more trouble with these carbs than any other set I've ever worked on and I've had trouble finding parts for them but after this everything inside the carbs (except the slides) will be new

[iggs]

This video is awesome! So detailed and informative, thanks for making this.

[poppacapinya]

nice video right to the point with details great job

[ClassicRider]

two questions -thanks; !- at 1:19 and that you are holding in 1:22 - where the fuel hose connects to the carb assembly the overflow occurs when parked. And my engine seems to behave if running on 3 cylinders or running on less gas ( similar to going to reserve on the highway) and then full power returns intermittently. I added Gumout. 2- the Black hose from below where does it connect to as seeing in many pictures it connects back to the assembly but not sure where. - thanks !