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How do I get fuel to the engine then? I have fuel in the carbs, they are full, I have vacuum sucking air in (stuck my hand on it and definitely was sucked in). I'm really at a loss of what could be impeding the flow. By "spraying out", it was spraying the other direction. Out of the intakes...

Okay so I pulled the plugs, and they are completely fine. Even checked if I have spark on each one and I do. Here is a picture of one of the spark plugs: https://imgur.com/0V9X81V Here is a video: https://imgur.com/nDB7NAH At around 14 seconds you can hear two pops and a little softer one from...

Sorry I should have clarified, I pulled the bowls and they were clean. Needles were also clean. I then put them back on and filled them, with no leaking anywhere. I put the carbs back on the bike and cranked it over. Nothing. I sprayed some carb cleaner into it to get it started, made one or two...

So I just pulled the carbs out, had a little drainage bucket underneath and filled them up with fuel, to the point where should've overflown had they not been functioning properly. However, everything was fine with no leaking out the top, and the floats seamed to be hold the fuel.

Yeah, float needles were all cleaned. and seem to be sealing properly. I just did a little test to see if even provided excess fuel, would it leak out the top (if the floats were letting in too much and causing to overflow) but they didn't; suggesting that they are sealing and floating well...

I'm 99.9% sure I did it right when I rebuilt it. I've been watching hackaweek and Peter Anderson for the rebuild process, and followed everything to a T. Could it be that the carbs are over flowing with fuel and leaking out the top into the main body?

Title basically says it all; I've been rebuilding my 1978 CB750A for the past three months, and I think it's finally in a shape to run. I rebuilt the carbs with the carb rebuild kits, and cleaned everything, and replaced all screws. I put it in, hopeful it would start, and as it was cranking...

I personally use vintagecb750.com Its a little pricey, but they come form Canada and everything is practically OEM. They have all their parts also sorted by year and make, so you can just look for your bike and see everything it's compatible with. Hope this helps!

Title basically says it all; I've been rebuilding my 1978 CB750A for the past three months, and I think it's finally in a shape to run. I rebuilt the carbs with the carb rebuild kits, and cleaned everything, and replaced all screws. I put it in, hopeful it would start, and as it was cranking...