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If it runs okay except for being hard to start after being out in the heat, there is nothing wrong mechanically. The heat is evaporating fuel from the tank through the breather and charcoal canister into the intake and flooding the engine. All you need to do is open the throttle to let in extra air if it doesn't start right away. Really, that's all it takes. The charcoal canister doesn't have the capacity to handle all the evaporated fuel.
