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Discussion Starter #1
I seem to have oil on my left exhaust from a drip, oil on one carb and also around the fuel tap, any ideas?
 

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Fuel leaking from the petcock could well run along the outside of the hose to the carb resulting in the staining there.
If there is oil and not fuel residue on the exhaust, it may be a different issue, like a leaking gear shift seal.
 

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I think I'm seeing a track on the fuel and you mentioned that the staining is also "around the fuel tap". I'd start by checking that the nut that attaches the petcock to to the bung on the tank and the hose clamp where the fuel line attaches to the petcock are done up properly.

And when that is dealt with loosen the clamp where the carb meets the boot from the airbox and re-seat the carb in the boot.

BTW: Welcome to the forum. Please add your location to your profile and your bike's model and model year (NOT year first registered as your UK ownership will indicate) to your signature so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).

And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and the Previous Owners may or may not have done the maintenance necessary to keep it safe & reliable so it is highly recommended to download the Factory Shop Manual for your model (available through the CX Wiki - link in my signature) and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel because old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet. If your bike still has the original rubber brake line(s) (should be replaced every 2 or 3 fluid changes = 5 or 6 years) I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid).
 
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