Ametrials

Hey guys! So i had to fix the cylinder for my bike, and decided to change the gear oil at she same time. After about a week the cylinder was fixed so I put it on and started the bike. I completely forgot about the oil and ran the bike for about 5 seconds or less without an oil in the engine. Then ofcourse i filled up the engine with oil, started again and it works fine. So my question is Is it possible that something in the engine is damaged? Because bike was running for like 5 seconds with no oil and it forks fine now