MotoGP Andalusian Grand Prix winner Fabio Quartararo says he's "not worried" about Yamaha's apparent engine reliability woes, following two failures in two races for Franco Morbidelli and Valentino Rossi. Factory Yamaha rider Rossi was forced to retire in the latter stages of last week's season-opener at Jerez with a mystery engine issue, while Morbidelli suffered an identical failure while battling for the podium in Sunday's second Jerez encounter. Autosport revealed on Thursday that Yamaha had sent an engine from Rossi and Maverick Vinales' allocation back to Japan for analysis, with the official engine sheet from Dorna Sports issues on Sunday morning confirming this. The sheet...
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