New here...Hello to all

[illinoisbambam]

I have been riding for years and have been through a 79 yamaha xs750 to a 82 Kawasaki kz1000 on to a 96 kawasaki ninja 900 and then came my daughter and away went the bike, Well it's been 13 years since I've put my leg over a bike but as a mechanic I had a friend/customer come in wanting to have me install tires and fix an electrical problem on his new 2002 goldwing and try to get his 1980 CB750K running so he could sell it. I ended up trading the labor on the wing for the title to the CB750K! Then the problems came...ALL the parts are here and it's complete and runs! BUT my float needles are leaking and I've cleaned the carbs and tried 2 different sets of needles (both used) to no avail. I have searched online and can find the needles but the seats are not replacable? Will new needles fix this problem? I'm so anxious to ride again and I want to do a full strip and rebuild this winter with a few minor upgrades like exhaust. Thanks to all of you for your help and advice.      Tim

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Welcome to the forum. I polish the seats with Turtle wax chrome polish, and a Q-tip. The new needles may help, but I have often found that these old plastic floats seem to dry out, or something like that that makes them not want to float right. So I often add a millimeter, or two to the float setting. Sometimes I end up replacing the floats though.
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[seestheday]

I thought only the 79 DOHC floats were adjustable?  Check the FSM addendums to make sure though.

I have an 81 cb750K and mine are not adjustable.

You're a mechanic, so you have probably already checked, but are the overflow tubes cracked?

Can you take pics of your floats?  I have seen some people that had incorrect ones installed.

[illinoisbambam]

floats are not adjustable stock. Although I do have another set of black ones that are adjustable the stock ones are a yellowish orange color and the tubes are good with no cracks. Sorry no camera and I don't have a cell phone.

[icerigger]

Yep, polish the needle valve seats, like Sees says, mild abrasive (I use Autosol) and Qtips, cut in half and chucked in a Dremel. Flush well with brake cleaner to make sure you get all the polish and crud out.