Topic: 1977 Honda CB750 Will not run without choke on.....

[Asusfang1997]

Hello all I need some help, I have a 1977 Honda CB750k. At first the bike would not run right so i took apart the carbs and did a full cleaning of them and even replaced the floats and the Slow jets from the 4into1 website, I also installed a Delkevic 4into1 exhaust on the bike. Since the rebuild of the carbs i have had issues with getting the bike to run with the choke off, starts up fine and runs great with choke on but as soon as the choke is off it dies out. After reviewing some posts with similar issues thinking maybe the slow jet passages were clogged, i took them apart again and sprayed carb cleaner on all 4 slow jet holes and saw visually that they were clear and it was coming out. I think maybe it might be the new Jets replaced they have 8 holes compared to the 6 holes that the original had. That's the only thing i can think of that may be an issue, otherwise im at a loss and was hoping someone with similar experience might be able to shed some light. Any advice is well welcome at this point. If i cannot figure it out i may send them to get professionally rebuilt and cleaned.
link to the ones i had ordered,
https://4into1.com/replica-keihin-slow-jet-honda-xl350-cb550k-cb750-1977-1978/

TLDR-Bike will not run without choke, passages for slow jet are clear. Replaced slow jets with kit from 4into1.com and had 2 more holes then original ones.
at a loss and looking for any advice or things to try before giving up and sending for professional cleaning.  Looking for anything to try at this point.

[scottly]

Go back to the stock parts.

[HondaMan]

4into1.com does not sell correct carb parts for any of the SOHC4 bikes. They never have.
Don't buy any critical parts from them: you WILL be disappointed with problems, much like those you're experiencing now.

[Asusfang1997]

Thank you thats what I was thinking reverting back to the old jets and seeing if it makes a difference. I appreciate the advice thank you for responses.

[scottly]

While you're at it, make sure the teeny tiny vent holes are clear.

[Stev-o]

Thank you thats what I was thinking reverting back to the old jets and seeing if it makes a difference.

You need first to verify that the old jets are genuine Keihin.  They should have the special K logo on them. Otherwise, get jets at jets-r-us...

https://www.jetsrus.com/a_jets_by_carburetor_type/a_jet_kits_keihin_selection.htm

[Johnie]

Go back to the stock parts.

Amen brother!

[bryanj]

Have you actually removed the press in pilot jets? They block up for a passtime

[fizzlebottom]

Replace those awful 4-int-1 floats with the originals as well if they're undamaged and within spec. I've had 4-into-1 floats fail after a season but my good 'ole original undjustable floats are still sealed and within spec.

[Asusfang1997]

Yeah I will revert back to all stock parts tonight and try to run it again and see if things work out. will keep you guys posted, apperciate all the responses.