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Congrats on your CB750F2N purchase. I now have a 1979 cb750 limited but had a blackbird in the mid 2000's. I liked the blackbird but it can't match the look of the cb750's engine that's a work of art unto itself. Enjoy your bike.

Sorry to hear the motor is damaged.

I rebuilt my stock carbs two months ago and put pod filters on. Plugs were white when I checked them as it was running too lean. Since then I've gone back to the airbox that made it run better and now I've re-jetted the carbs to 110 main jets (was 102 stock size) and pilot screws from 1.5 turns...

https://www.amazon.com/Motorcycle-Carburetor-Intake-Manifold-CB750C/dp/B07H4NXL7S/ref=sr_1_1?keywords=Honda+CB750C+CB750F+CB750K+Carb+Intake+Boot+Brand%3A+Qiilu&sr=8-1 They are not great 100% reproductions but they worked for me.

Too much air is getting into the motor. Check for vacuum leaks.

I bought some cheap ones off amazon and they worked for me. The old ones were really hard and had no give to them.

Carb to engine.

Sounds like a vacuum leak. Check the carb boots by spraying carb cleaner on the joints while the bike is idling. If it revs up then you have air leaking into the engine at that spot. I had the same problem with mine and needed new rubber carb boots as mine were dried out and didn't seal anymore.

Use lots of brake cleaner to clean out the passages and then hit them with compressed air to push all the dirt out of them.

Those are the 1979 style floats that use adjustable float needle, you can use yours. Check the 4into1.com website they have carb kits. This one has both types of float needles. https://4into1.com/carburetor-rebuild-complete-kit-honda-cb750c-cb750k-cb750l-1979-1982/ Vintagecb750.com has kits...

cb900 had 32mm Keihin carbs. cb750 has 30mm Keihin carbs. I'd stick with the 30mm cb750 ones or buy a new aftermarket set. Any used carbs will need rebuilding so don't spend too much on them, I wouldn't pay more then $150.00 on a set because a good rebuild kit is going to be at least $80...

The 650 carbs will be smaller. Keep looking for a local 750 set, used carbs that need rebuilding shouldn't cost more then $100.

I would try soaking the broken tips and then hitting the fuel circuit with compressed air to see if they dislodge.

1979 to 1983 will work. Only difference will be the floats on the 79 and later ones have a added on (separate part) vacuum port for the fuel petcock.

Try soaking the carb passages with marvel mystery oil or deep creep for a day or two before disassembling them to loosen up the frozen and gummed up parts.

Used stock carbs are cheap keep an eye open for a set locally. You can always use stock ones to get it running and then upgrade to aftermarket ones later.

It's a DOHC CB750. http://www.hondaboldor.nl/cb750f/

I would disconnect and clean all the wiring connections with contact cleaner first. Could just be a bad connection. http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter17IgnitionSystem.pdf

Camshaft lobe positioning will tell you if it's on the compression stroke. Turn it over by hand with the valve cover off and watch how the valves open and close on that cylinder. But I think these motors use a wasted spark system that fires on both the compression and exhaust stroke. So the...

Sorry to hear things didn't get sorted out. You could probably find another one for less then the cost of paying someone else to fix it. Maybe sell it to someone who can use it for parts.

Did you check the wiring inside the headlight? My 79 has a bunch of wires and connections in it, something could be lose in there.

I just put Dunlop 404's on my 1979 cb750L. Good tire for the price.

Very nice bike. I like the cross drilled rotors and aftermarket exhaust, very tasteful upgrades from stock. Enjoy.

Have you had the motor apart before this?

ebay is probably your best bet for side covers and gas caps. I've gotten parts from vintagecb750.com. https://carpyscaferacers.com/shop/shop-our-store/motorcycle-parts-accessories/honda-cb500-cb550-cb750-parts-upgrades/honda-cb500-cb550-cb750-gas-cap/

It could bend the valves but you can't really tell until you take it apart or do a compression test on it. I'd try the following.

Getting a shop to do it maybe your best bet. Or if you feel it something you can do yourself get a Clymer manual and take your time. Either way you may want to spend a few dollars on new cam chains instead of trying to get the same old chains to work as they could be stretched to a point that...

I ended up buying Dunlop D404 tires front and back.

That's a good deal at $4k. If you like the bike then it's worth it.

Check page 94 on the following link for the info on installing and aligning the camshafts. cb750 cylinder head Manual