I feel like an idiot. Probably am.

Was rushing around. Fresh oil change. Slightly under filled. Towards the end of the day when I was pushing the crf 450r I could hear a slapping type of sound. I can’t tell if it was coming from the engine or the front sprocket area. It ran fine and I didn’t hear anything that I normally don’t. It was only when the engine was off, in neutral, and being pushed. But it wouldn’t do it every time I would push it.