Yamaha says it is "confident" in the reliability of its engines for the 2021 MotoGP season, having been hampered early in 2020 by technical issues. The Japanese marque suffered mechanical issues on several of its engines across the Jerez weekends in July, with Valentino Rossi, Maverick Vinales and Franco Morbidelli all losing units to problems. It transpired the issues related to a faulty batch of valves, which proved to be non-homologated parts and led to Yamaha being docked constructors' championship points, while it had to withdraw the offending units from its allocation. Yamaha said the use of non-homologated valves was a result of "internal oversight" and a...
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