Hi. I'm not sure if you mean it doesn't turn over or it turns over and doesn't fire up. Either way heat could be a problem. The starter could be hot and nor engaging ,they do sell heat shield "blankets" so it is a some what common problem. Or if it doesn't fire it could be the gas has sat, no flow of gas from a running motor, gotten hot from the engine and has created a vapour lock. Just two possibilities. Best of luck.