1979 Honda CB750K Carburetor Repair and Cleaning
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- čas přidán 25. 08. 2024
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In this episode I’m repairing a cracked fuel supply T-Pipe and cleaning all four carbs from a Honda CB750K.
This is a short video with no talking.
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DISCLAIMER: The Information provided in this video IS NOT professional advice. It is simply a demonstration of how I performed this task and is for informational purposes only. If you are not comfortable performing this type of work, seek professional assistance. Always follow the manufacturer’s instructions when performing maintenance or installing parts and equipment.
Tim, I saw many clips on the overhauls. Yours is amazingly done. I would shake your hands if you were close by
Thanks so much
Another great video on 79 cb750. Pls make more videos on 79 cb if possible. thanks
Hey, Tim! Great video. Quick question: why the two small washers on the needle? Is this because you’re running pod filters? I know that the needle doesn’t traditionally have those washers...at least mine doesn’t. Thanks for any response/help!
I can't get the Relief Spring for the choke to set up worth a flip. Been searching online for hours with no GOOD help in video form. I'm sure I have damaged the spring now. If you can do a video on that stupid spring and proper setup of it so that the choke can function properly - that would be most excellent.
They're a pain in the arse ain't they? I think the spring you're referring to is the one that brings the right hand pair of choke flaps into play.
One has to give the spring one full turn forwards and engage it with the notch in the operating arm in order for the arm to rotate. Otherwise your choke will only work on the left hand pair of carbs.
I use a couple of small picks for this task.
Cheers.
Where did you get those floats?
Hey buddy! Thanks a lot for the video! I´ve noticed that the springs are not iqual, can you explain please, have the same issue with my CB750, they seem to keep open and the springs are too soft.
I just rebuild a set of these, having issues, idle fine, 3,000 on up, fine, 1,000 rpm to 3,000, stalls, throttle twist. Or try in gear, clutch take off, what to look 4 ? I have tried 3/4 to 2 turn out on air fuel mix, what is right setting ?, 68 and 100 jets. Bet i d
Spent 2 hrs, getting those darn sliders to work decent. Help needed
Great video! Do you know model name of the carbs?
I noticed a small black rubber cap right next to the jets. What is it used for? Also mine are starting to break down and I don’t want to put it back in my carburetor if it’s going to clog it again. Any tips?
Hi Brad,
That is a rubber plug/cap for the slow speed jet. This bike had them, but I have seen others without the plugs. THEY ARE NEEDED to prevent raw fuel from being sucked into that jet from the bowl. The plug forces the fuel to follow the proper path through the slow speed jet. So, if you have one missing or starting to crumble, you should replace them. I would replace all four to be safe because they do get hard over time. I'v seen sets of 4 plugs for $10-15 (US) on eBay and other sources.
I hope that helps.
Thanks for the comment and for watching. Best of luck with your project.
Hey Tim, great video, really enjoying watching this and the other CB750 DOHC vid, please do more. Could you tell me what the two washers were for on the needle?
Hi Tim,
The washers to raise the main needle jet is a fairly common mod for the CB750 to make the mixture a little more rich. The use of washers is a cheaper and easier alternative to re-jetting the carbs. The theory is that it makes the bike easier to start, warm-up, and runs better. This bike belonged to someone else, so I left everything as is and only repaired problems.
You can search the internet to find more info about this mod if your interested in doing this to your bike.
Thanks for the comment and for watching.
Tim2Wheels oh ok I was about to ask the same question because I getting ready to rebuild my carbs and my needles didn’t have any washers when I disassemble them I thought they were missing
How do you lean the pressed in pilot jets when they are plugged solid?
Air an fuel ratio?
Can’t get this 750 to run right after carb clean. Idles just fine
1974 CB 750 Question is the rubber hoses on bottom of carburetors what are they and where do thay go? I found mine just hanging leaking gas
Hi Ricky,
I think you seeing the overflow/drain tubes. They should route the excess fuel down under the bike to drip on the ground. They should not leak all the time. Usually when the carb bowl is too full (flooded) it allows the extra gas to escape. If it is leaking a lot, you may have a stuck float in that carburetor. Cleaning or re-building the carb would fix that.
I hope this helps. Thanks for the question.
Tim
I have the same problem on my '79 limited edition. Any folks knowm
Hey Tim, quick question. My father has the same bike/carb rack. One of the carbs is leaking, he thinks it has a "bad seat". Said the whole unit needs to be replaced. Any thoughts on this?
Hey Tim..No bull video mate. Dave here, Hi From Australia,,, I have similar / same carbs on my CB1100f 83 mod ...When rebuilding my carb set I noticed the seal under the top vac/cylinder has a step in it (and this set had them Fitted different ways up).. Your video is not "Zoomed in enough" to show which way up your fitting them... it seems right with the step facing up but the step is too deep to make contact with the bowl "so no seal would occur between bowl and body"..But with the flat facing up it "bends the seal" when tightened down..Left me wondering is it the right seal, but the bike is very original,,,, If you are 100% sure of the right way this goes I would love a response... Cheers and thanks in advance
Hi where can i buy 1982 honda 750k carburetor im in south africa
grundstillingen på tomgang skrue hvad er den ?
hey bud nice video. however a good clean would be running a thin wire through all passages, not using air. and you forget about all rest of the passages
Hey good point. A wire would make sure to detect any blockage.
Thanks for the comment and for watching.
@@Tim2Wheels I would not use wire to avoid scratching the aluminum. I would rather use a nylon guitar string. :-)
@@colonia5941 compressed air my friend. Risk free. Unless you don't hold the jet
@@Tuukkis Yes, but not everyone has a compressor. Guitar strings are available from your friendly guitar dealer for a few dollars ;-)
I'm sorry, but videos that don't show the whole job are in my opinion misleading, and could encourage people to dive in & end up in this case ruining their carbs.
You obviously know what you're doing, but you skipped the part where one has to grind off the tips of the choke flap retaining screws, which have been peened over. Otherwise you'll knacker the thread in the mounting bar when removing them. When replacing them, one should always use new screws, and Loctite them in before giving the protruding thread a dink with a small chisel for added security.
If one of the screws should undo and fall out it'll get sucked into the engine and most likely ruin it.
I've been fixing bikes for over 30 years for a living, and nowadays I overhaul more carbs than ever, because being old school most younger mechanics don't know how they work. I see a lot of carbs that have been worked upon by the uninitiated, and in some cases they've been ruined because someone forgot the three F's rule....Carbs are fiddly, finite, and fragile.
All the best.
Can I send you my carbs bro? Cb750 SOHC
Turnvthe music off or quit the crack