Cook the spaghetti as usual and cook until al dente. Drain, return to the pot and keep warm.
Meanwhile, heat 2 tablespoons of oil in a pan. Then add the garlic and chilli pepper and fry for 30 seconds. Add the crab meat with parsley, lemon zest and lemon juice and simmer, stirring constantly, until the crab meat is well warmed through. Add the crab meat with the remaining oil to the noodles, season to taste and mix everything well. Serve hot.