Honda CB750 Carburetor Rebuild

Buy the carb kit or the ultrasonic cleaner at the following links!
Carb kit: amzn.to/38UHcwS
Ultrasonic cleaner: amzn.to/3qBaMh2
In this video, we rebuild a four pack of carburetors off of a late 70's CB750. Let's get down to it!
Follow me on Instagram for a sneak peek of what I'm working on during the week!
/ blastworksnl
Music by Chillhop: / chillhopdotcom
Bonus Points - Pizza and Video Games: / bonuspoints

[@armageddon1963]

Right in the middle of this job now on my CB750F2. Wouldn’t idle and hard to start so ordered a rebuild kit and once it arrives this video will be invaluable. Thanks so much for posting. 👍

[@blastworks]

Hey Armageddon Harley! Glad this video is going to help you out with your rebuild! Good luck!

[@MADBROW]

Did you figure out what your issue was? I sounds like the same issue I was having.

[@jilbertjimenez7275]

Hey mate Where did you order the rebuild kit from?

[@armageddon1963]

@@jilbertjimenez7275 Hi. It came from David Silver spares online. I think it was about £90 for all 4 rebuild kits.

[@armageddon1963]

@@MADBROW Yes. They were hopelessly out of balance and there were air leaks all over the place. In the end a carburettor guru local to me sorted them out.

[@barrymoore1924]

Great content, excellent vid quality. Thank you.

[@blastworks]

Thanks Barry!

[@Aliencreep369]

The first step was the best and most important of all 👌

[@blastworks]

Nothing like a couple cold ones to help with a carb rebuild!

[@joelhallstrom1239]

Totally missed this video! Those carb racks can be a pain in the a-s with leaking fuel connections🙈 Good job!!

[@blastworks]

Thanks Joel!

[@lukehoff9775]

Nice video! I have a 78 cb550k and all the videos for a 550 show diff carbs. My carbs match the carbs in your video except mine don't have the accelerator pump.

[@blastworks]

Thanks Luke! I hope my video was informative!

[@Nomix22]

would this be applicable to a rebuild on the cb650 custom?

[@dietriho]

Hi there, what coincidence.. this weekend I started to rebuilt my CB 550K3 carb and notice that this here is 95 % applicable for my tasks. P.s. I wish I would have here a slow mo button. ;-) (sometimes)

[@blastworks]

You can slow the video playback speed on the gear icon!

[@dietriho]

@@blastworks Ah Cool will try and regards from Berlin /Germany!

[@freezerburn04]

Thank you, I can do this now. A++ shot in the arm of confidence. The ‘pro’ rebuild guys want $500-$750 to do it and you never know how far they really went in to a full rebuild(as you did)... I’m going to save my money and buy an ultrasonic parts washer and go for it! 👍🙏👋

[@blastworks]

Go for it freezerburn! Nothing like adding new tools to the shop!

[@MrShad0wM4]

Wish i could find someone to do this for me terrified to pull these apart lol. Feel like if I do I won't get the back together

[@blastworks]

Hey Emerald Oasis! It's totally doable! If anything, just take lots of pictures with your phone as you go, and you'll get it back together, no sweat! I felt much the same way when I started doing carburetor rebuilds, and taking lots of pictures helped significantly. Once you get your first one done, you'll look back and wonder why you were so worried! Dive in! :D

[@wesleyaustinhardee2060]

Thanks for this video man. I’m having issues with a cb750 I just got that supposedly has 900 carbs on it. So as you can tell I got my hands full lol. I’m hoping I can get a 750 carb rebuild kit and install it into the 900 carbs as I’ve heard their the same carbs just different jets.

[@dylantucker2574]

How much on the set screw, I can’t find how many turns you need. The one with the spring, and is there an o ring that goes under the spring.

[@blastworks]

Hey Dylan! You can find all of the appropriate initial carburetor settings in the service manual. Grab a copy from my website! Click the Manuals link, and then you should see Honda CB650 (1979 - 1982) - Service Manual.pdf there. The settings for the 650 carb should be close enough to get you started! www.blastworks.net/

[@billk3k320]

Can you tell me where you set the idle screws on this carb set up? I’m finding different information on the stock factory setting. Thanks in advance!

[@blastworks]

Hey Bill! Usually I'll put both the idle adjust and the air fuel mix screw in all the way until the lightly seat, and then back then out 2 full turns. Once the bike is running, I tweak things until the bike is running good. Then a quick ride and double check on the plugs to make sure things aren't running too rich or too lean!

[@billk3k320]

@@blastworks Appreciate the reply and really appreciate the fantastic video!!!

[@masterofnonetv8361]

If you tear these carbs all the way down like that you always change the throttle shaft seals or youre going to put them back together and have a vacuum leak.

[@blastworks]

No issues since doing them.

[@jasonrosas1295]

Can u keep the same floats if you throw them in the ultrasonic ?

[@blastworks]

Hey Jason! You certainly can do this without replacing the floats. The floats in these carbs are solid and did not need to be replaced, but they were because there were new ones available!

[@abelstock]

I want to buy a Honda CB750F from 1981 and it has a carburator failure, this video is the last push to buy it, hope this precess help me :) Wish me Luck

[@blastworks]

Good luck, Abel!

[@sebthayer4231]

Where did you get your ultrasonic cleaner and what kind is it/how big is it?

[@blastworks]

Amazon! 3L/0.8 gal. Just search for ultrasonic cleaners on Amazon and you'll find a whole slew of them!

[@blastworks]

Hey Seb, just as a quick follow up, you can get the same ultrasonic at the following affiliate link. If you plan on buying one, feel free to use the link as it helps me grow my channel! amzn.to/3qBaMh2

[@krabkrabkrab]

Looks like you never took the man jet / emulsion tube apart.

[@blastworks]

Sometimes I do and sometimes i don't. Ultrasonic takes care of it!

[@DocJonesGarage]

If the "accent" lol and the power fist box didn't give it away He's in Canada folks! Greetings my eastern brother from British Columbia!

[@blastworks]

All the way our east doc! Hello back from Newfoundland!

[@brianbrandon1676]

I'm lost I don't know how to set my cub everything I set it wrong it's doesn't Rev full and back fires

[@blastworks]

Backfire is usually a sign that you don't have spark on one or more cylinders. I'd start there if I were you.

[@anthonyakers6374]

How do you get the pilot jet out is it pressed into the carb?

[@blastworks]

Hey Anthony! Some carbs have idle jets threaded in to the body and some have them pressed in. Usually they'll thread right out if threaded in. If they are pressed in, you can usually lightly grab them with vice grips or pliers and with a combination of turning and pulling, you can work them out. I did that with the idle jet in my recent Honda XL 125 carb rebuild video. Yes, that may end up putting some light scratches on the outside of the idle jet body, but it will not impact how the jet performs.

[@anthonyakers6374]

@@blastworks Thanks!!

[@casketrepair]

What is the part that you pull from the top of the carb @7:08min called? 3 of mine are stuck

[@blastworks]

Hey Casketrepair, I believe you are referring to the top set (#5) as illustrated in this diagram: www.cmsnl.com/honda-cb750k7-four-canada_model14396/partslist/E19-1.html#.YHa3AGnReNw

[@casketrepair]

@@blastworks Looks like it's the throttle valve (#13) yay

[@blastworks]

@@casketrepair Whack the penetrating fluid to it! That cmsnl.com site is a gold mine when it comes to looking up part numbers and the like. I use it all the time!

[@casketrepair]

@@blastworks got them soaking this morning after I ran to the store. Got 2 loose, gonna take them to work and hit them with the strong stuff.

[@blastworks]

@@casketrepair Awesome!

[@sawbilly2]

Whats the best way to get the fluted boot back in the accelerator pump.

[@blastworks]

Whatever way works! I know it can be a pain, but I made sure that I put it back on the carb before the entire stack was put back together. Other than that, just be patient and power through it!

[@sawbilly2]

My stack is together. So the bellows pushed through the bottom to a groove or snaps on the top. No clarity on my manual

[@blastworks]

@@sawbilly2 you may be best served to pull half the stack back apart to make it easy on yourself.

[@sawbilly2]

I realize that would be easier. Just asking does it go on top of the tube or into the tube. In other words do i push the whole thing thru to a groove inside or fit over the top?

[@blastworks]

@@sawbilly2 I believe it goes through. Cmsnl.com should have exploded views of the carb and it should be visible in their diagrams.

[@ccedadi]

What lift table is that?

[@blastworks]

ccedadi, it's a lift that I built myself. You can check out the 15 minute montage and the detailed build series in this playlist on my channel, check it out and drop me a sub if you like it! kzbin.info/aero/PLdncjgRW7zzym-UEIuO465fPVZxOeJY17

[@Floshen]

But how the fuck do you disassemble and reassemble all those springs

[@blastworks]

Take lots of pictures and video on the take down and you can always follow them to get it back together!

[@rickbell8197]

how do I get mine done. Are you for hire ?

[@blastworks]

Hey Rick! I take that as a great compliment! Unfortunately I'm busy with personal projects right now and am unable to take on any work. I'm also likely located very far away as I'm on the east coast of Canada!

[@rickbell8197]

@@blastworks right on - I could always ship them to you with the rebuild kits if you change your mind.let me know

[@eyybc]

please say what year it is in your title

[@blastworks]

"what year it is in your title". How'd I do?

[@emryb]

@@blastworks 😆

[@unwillingful]

how many hours did this take?

[@blastworks]

I can't recall exactly as it was about a year ago, but I actually broke it up over the course of a couple evenings. I believe each carb did 20 minutes in the ultrasonic. Stick on a few hours for disassembly & reassembly and you've got yourself an afternoon in the garage.

[@unwillingful]

@@blastworks Thanks for the reply! I'm not a mechanic but i am going to try rebuilding mine soon. You did an amazing job! Maybe I'll record myself doing it so i can remember how to put it back together LOL

[@blastworks]

@@unwillingful Even taking pictures as you tear down is a great reference for reassembly. I'm sure you'll do great!

[@chrisross4923]

Where did you buy the Carb rebuild kit at? I need one for that exact one. Great tutorial!

[@dinybird43]

4into1

[@blastworks]

Hey Chris! The guy I rebuilt it for provided the kit, but there are numerous places online where you can get them If you search "CB750 carb kit" on ebay, or even more generally on Google, you should get a ton of hits!

[@jhill3514]

Yes Bye !!!!!

[@blastworks]

Ya knows!

[@balmeros272]

Did you get someone else to actually refit them them to bike ? Another video minus s refit demo 🤣

[@blastworks]

I was handed the carbs as they were already taken off the bike, so no refit demo. Thank being said, I actually just bought this CB750 off the guy I did the work for as he has not had the time to restore it himself, so there's a high likelihood you'll be seeing videos of that on my channel really soon, so make sure you are subscribed!

[@balmeros272]

@@blastworks It is a quality video, Just cant see anyone on yourube refitting bank of carbs on PD carbs for 1978 k7. Hopefully soon huh.

[@kensmith9334]

Too much fast video!! But still great detail!

[@blastworks]

You can set the player settings to play at slow as 0.25x speed. This video would have been hours long if I didn't FFWD!

[@joeblow5958]

Wow, you’re so cool. You drink beer. 🙄🙄🙄🙄🙄

[@blastworks]

Second most popular drink in the world!

[@tysonkonken6184]

That video is WAAAAAY to fast!

[@blastworks]

KZbin player has playback speed settings so you can slow it down, that should help you follow along more easily.