I've been to Goa a number of times. There is a lot of cloned Vespa and Peugeot rev & go types. You can hire them for as little as £2 (GBP) a day - including fuel. Fantastic experience competing with elephants on the tight blind bends.
As for mopeds I did see a lot of Jawas. Can I suggest that you Youtube 'road scene Mumbai' (insert the actual place you are visiting) and you will get a good flavour of what peds you are likely to encounter.
Ride safe and enjoy!