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If the bike is running well, and the plugs look good, then don't mess with the EFI. Do use an OEM paper airfilter in the airbox. 2002 is a solid lifter engine. Use 15w50 or 20w50 synthetic. I would use Mobil-1 V-Twin, if it were mine. Easy to find at any auto parts store.Frame is the same for EV, Bassa, Special, Jackal, Stone. Center stand was original equipment on the EV and Bassa. Optional on the Jackal and Stone.Check with MG Cycle or Harpers for centerstands, owners manuals, and shop manuals.
Good to hear your update. For the centerstand any Tonti one will fit. I put a stand from a '79 SP on my Jackal. Later model stands had extra bracing and a more substantial arm for deployment so that is what you are looking for.