Yamaha has made a request to all MotoGP manufacturers to unseal its engines on safety grounds following a series of mechanical issues, Autosport has learned. Autosport first revealed last month that Yamaha had sent an engine from Valentino Rossi and Maverick Vinales' allocation back to Japan following the Spanish Grand Prix for inspection after the former was forced to retire with an issue. Autosport understands the issue was found to relate to the inline four-cylinder engine's valve system. At the following week's Andalusian GP at Jerez, Franco Morbidelli was forced to retire while battling for the podium because of a similar issue to Rossi's. That unit was removed from his allocation,...
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