Yamaha handed MotoGP points deduction for technical infringement at Spanish Grand Prix

Fabio Quartararo won the Spanish Grand Prix, his first MotoGP victory. Mirco Lazzari/Getty Images

Yamaha have been docked 50 constructors' championship points by MotoGP stewards after making technical changes to their engine without obtaining unanimous approval from other manufacturers, the sport's governing body, the FIM, said in a statement.

Autosport had reported that Yamaha were under investigation by stewards for allegedly breaching homologation rules with engines used in the season-opening Spanish Grand Prix.

An FIM ruling said that Yamaha failed to respect the protocol due to an "internal oversight" and docked the constructor double the points they earned from Fabio Quartararo's victory in Jerez.

The Monster Energy Yamaha factory team have also had 20 points deducted from their championship tally, while satellite outfit Petronas Yamaha SRT were docked 37 points.

The penalty drops Yamaha to third in the manufacturers' standings, on 158 points, behind new leaders Ducati (171) and Suzuki (163).

None of Yamaha's riders have been docked points in the riders' championship, with Frenchman Quartararo, Spaniard Maverick Vinales and Italian Franco Morbidelli all within 25 points of Spanish leader Joan Mir of Suzuki.