You could start by cleaning the carburetor but before that I'd be more interested in finding whether the float bowl or the fuel tank has any water in it. Then again this could simply be a minor vapor lock.
Possibilities are many, start from the easiest fix and work your way around, start by keeping the motorcycle in the sunlight and then opening tank lid for a few seconds before trying to start it, if issue vanishes then its just a vapor lock, if not then try the next option.
Edit: On motorcycles with considerable mileage/age it is best to change manifolds when taking the carburetor off, they're cheap and saves you a lot of trouble in the future.




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