just bought 1980 cb750c

[spencer Johnson]

Just bought a 1980 cb750c.  My first bike.  I didn't want anything fancy, just something common (cheaper parts availability), big enough to cruise without vibrating to death, and something that would be dependable.  From what I have researched, i should be ok.

It has a spark plug that was cross threaded so I am heli-coiling it.  The carbs probably need to be pulled apart and cleaned.  When I turn on the gas, the gas comes out the bottom nipples of the carbs.  I shut the bottom needles down, but gas keeps coming out.  Is it most likely a float problem?

I put a new battery in with an "on board" trickle charger system that I mounted behind the side plastic cover piece.  I need to slowly begin cleaning, detailing, upgrading different parts as it was mechanically taken care of (engine had just been rebuilt before I purchased), but it has some damaged pieces.

If anyone wants to throw info at me of what to beware of, what to make sure i pay attention to... basically i am open to learning anything people "in the know" are willing to share.

[Piute]

  Welcome
Great group of guys here (well most), I believe most are new to CB 750s and all wont to learn,Like myself,
 Seems you know your way around Mechanics by what your doing now, Witch I am still doing Detail,and finding that this bike is stock (old)and needs attention in lots of areas to be as trust worthy as it should.
   Your d.o.h.c. should and will be a great 1st bike wise choice.

[seestheday]

Welcome to the forum.  I recommend downloading the manual from the links on the front page.  They're a great resource.

To answer your question about the gas leaking out of the bottom nipple on the carbs, yes that is probably a float problem.  That said, what do you mean by "shut the bottom nipples down"?

Also, do you have a link for the battery with the built in trickle charger?  I'm just curious about it.  Do you plug it into the wall?

[spencer Johnson]

i closed the bottom "needles", not "nipples."  I'm not that great with carbs, so I would have thought that would have stopped the flow out the bottom, but it did not.  Do you have suggestions for carb rebuild kits?

I custom made the trickle charge unit.  Maybe i can take some pics and post them.  I bought a small enough unit and fabricated it to mount behind the right side plastic cover where you access the battery.  it is actually quite simple and only required a little thinking and welding.  I like the idea of being able to plug in anywhere without having to worry about packing one.

[spencer Johnson]

thanks for the "welcome."  I was happy to find a site dedicated to the cb750.

[TOOLS1]

Welcome to the forum. The one thing to watch on the DOHC bikes is the charging system.
TOOLS

[seestheday]

regarding the screws that you "closed".  you'll figure this out when you do a rebuild, but you may have closed the float drain screws, or the air/fuel mix screw (you will need to be re-calibrate if you screwed them all the way in).