Honda admits the current MGU-H design on its Formula 1 engine is only strong enough to last two races, after suffering more "unacceptable" reliability problems at the Monaco Grand Prix. Jenson Button qualified ninth in his one-off return to F1 in place of Fernando Alonso in Monte Carlo, but will drop to the back of the grid after collecting a 15-place penalty because Honda decided to change the turbo and MGU-H on his engine after Thursday practice. Honda is not yet sure of the exact cause of the problem, which its F1 chief Yusuke Hasegawa says relates to the "rotation of the bearing" on the MGU-H. The MGU-H design was modified for reliability after McLaren-Honda suffered...
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