Yamaha is under investigation for allegedly running illegal MotoGP engines during the Spanish Grand Prix weekend at Jerez, Autosport understands ahead of the European GP. Yamaha's early season was overshadowed by reliability issues with its engines, after Valentino Rossi and Petronas SRT's Franco Morbidelli were forced out of the Spanish and Andalusian GPs due to broken motors. The analysis carried out at the time attributed the problems to a faulty batch of valves from a secondary supplier. Due to the engine freezing rules, Yamaha could not unseal its engines to fully rectify this - though did request on safety grounds to do this to the Manufacturers' Association, but withdrew the request...
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