Once my engine is warm, I need only hit the key. If it is hard starting after 5 minutes and even harder after 30 mins (especially if you have to hold it wide open to clear flooding), you may have a percolation problem where heat is boiling the fuel in the float bowl. Try adding a phenolic spacer between the carb and manifold to better insulate the carb. Also to consider is blocking the crossover passage in the intake manifold (tin foil works well) to reduce the temperature, although cold weather performance may suffer a little.