Hey welcome, I've got a Gillera runner that's been sat in a garage for a few year, and im thinking exactly the same!! I've not had a chance to look yet but I was planning to do an oil change new battery clean the air filter replace the two stroke oil and petrol. Remove the sparkplug squirt in some lube and gently hand crank it over to make sure it's well lubricated before replacing the plug and starting her up! If it runs great, if not then it's diagnostics time... Think I might also need to do the fork seals too and not sure if the conditions of the tyres - they might have gone hard/cracked. Great fun bikes so definitely worth a punt. Edit.. this might be useful. https://scootergrisen.dk/scooterhjemmeside/download/gilera_runner_rstsp_servicemanual.pdf https://scootergrisen.dk/scooterhjemmeside/download/haynes_gilera_scooters_service_and_repair_manual_small.pdf