I recommend disconnecting it at top of airbox and leaving it attached to avoid the hassle.

The hoses are just drain hoses. They're not required. If you unscrew the drain screw then fuel will flow out the nipples on the bottom. If you have the little hoses on its easy to catch the fuel in a container. If you don't it'll just dump on top of the crankcase. Have you cleaned your carbs yet? You may have a secondary main jet clogged.

There are two throttle cables. The second one is there for safety reasons. It rolls the throttle off. It isn't really needed, but it's there in case your throttle return spring breaks to ensure the throttle doesn't stick on.

Simon Austin Gotcha thanks, I just picked up the same bike but a 1980.

Justin Lee yes, the brass nipple.

Bronze spout is for the fuel. Plastic t between 3 and 4 is an air vent.

Simon Austin on top of my carbs both spouts are bronze and both sit between 2 and 3 one next to 2 and one next to 3. Below the carbs I have one between 1 and 2 and another between 3 and four which were originally attached to a 2 to 1 connector. Which is the fuel spout?

Mikael Hartmark What year is your CB750? If it is prior to 1979 then you have an SOHC and they have completely different carbs. Or are you "norwaysfinest88" posting under a different name? If so, the 1978 model is definitely a SOHC with the "keyhole" carbs. I don't know much about those. You should ask someone who does. There are plenty of SOHC cb750 forums. You can check out forums.sohc4.net, or my favourite: honda-cb750-s.456789.n3.nabble.com/ That said, on the 1981 cb750 DOHC carbs the spout on the front of the carbs is for the auto petcock. It's a mess of tubes that sits on top of your carbs. Many people remove it because it is a common source of carb related problems including cold starting issues. If you remove it, you have to block off that spout on the front of the carbs for the bike to run well. I just used a rubber cap and gas line metal clamp. You can see it at 0:01 in the video. The brass spout on the top of the carbs gets the fuel line. On the 1981 carbs this is between carb 1 and 2.

Thank you! Yea I'm norwaysfinest it switched for some reason. I looked at the forums and I havnt been able to find a clear explanation as to which spout is the fuel for the 78 k model

Its been several years since i sold this bike, but are you running factory exhaust with the factory air intake box or are you trying to run pods or a non standard exhaust? First thing I'd advise trying is to go back as close to factory as you can, including for all jets.

@@TheSeestheday hi, txs for Your comments, Nike si completely factory Specs, nothing changed

@@alejandronestorrozzi7788 I would ask some questions on the cb750.com forum. They should be able to help you.

I believe that procedure is outlined in the factory service manual. You should be able to download a pdf of it from one of the cb750 forums.

Ok. I'll try to do that. Thanks

Thanks, glad you found it helpful. I'm obviously not a professional speaker lol, just a guy who liked working on his bike.

Jeeez man, he's obviously got a speech impedement. Give him a break!

Lol, no I don't. Thanks for being a white knight I guess...

Trevor Grosswiler simple thank you would have been sufficient. what the heck is wrong with people like you? I assume you must be perfect in every aspect of life.

You should order some new ones. Mine were like that at first before I ordered new ones. You likely already have a vacuum leak. To get them off you're going to need more force, and you might need to cut them/weaken them so they'll break instead of your carbs when you pry them off. They will likely break apart in chunks. I had to spend about a half hour cleaning the baked on old ones off of the engine before I could put the new ones on.

Maris Arce Use a heat gun gently on the intake boots and a smear or oil and the carbs just slide in,

I am 62 and have been fooling with these CBs for a long time, what I do when the boots are hard like that, you must know that they inject plasticize in them when they are new to make and keep them soft enough to work with, so silicon contains plasticize in it, take the boots and clean them with pine-sol, dry them and put them in a plastic zip lock bag, (good seal) spray them well with silicon several times and seal them in the bag, its the gases that refresh them enough with the ability to soften them up, the longer you do this process the better they get,

TIOMACHY open your ears old.man