Request a cold start to check for startup issues or smoke. Listen for unusual rattles and check for "bluing" on exhaust pipes, which may indicate overheating.
Inspect the chain for rust, seized links, or "hooked" sprocket teeth. If it's a belt-drive, look for cracks or abrasions. buying a used motorcycle from a dealer
Compress the front forks and check the seals for leaking oil. Request a cold start to check for startup issues or smoke