Valentino Rossi unsure about new Yamaha MotoGP engines for 2019
|By Matteo Nugnes, Carlos Guil, Jamie Klein||Thursday, November 22nd 2018, 15:43 GMT|
Valentino Rossi says he is not fully convinced by the new types of engine Yamaha brought to MotoGP's post-season test at Valencia, as his pace was "not fantastic" with either unit
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