Honda admit is is 'very complicated' deciding when to introduce a new Spec 4 engine as it means penalties for both Red Bull and Toro Rosso. Honda have already introduced two engine updates this season, the Spec 2 and Spec 3. The latter has been in action since the French GP but already the Japanese manufacturer has another upgraded ready to go. The question is when do the Red Bull and Toro Rosso drivers take it. 'We are discussing all the time with the teams and we will decide when we apply a new engine or updated spec,' Honda's F1 technical director Toyoharu Tanabe told Motorsport.com. 'At the moment no decision has been made yet. 'It depends on the situation and timing and the result of...
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