My younger brother and I were riding at briarcliff a few days ago. He was pushing his bike so I got off to see what happened. He said it made a really weird noise and ran funny so he turned it off. I kicked it a few times and it started for barely a second and made a noise like something was spinning. It wouldn't start again but it still kicks over. I know it is not electrical. It's a 2005 cr85. Please help. Also the bike still has the original piston. My dad thinks that it may be a hole in the top of the piston.