Monster Energy Yamaha have withdrawn rider Maverick Vinales from Sunday's Austrian Grand Prix following his "irregular operation of the motorcycle" in last week's race.
The 26-year-old failed to finish the Styrian Grand Prix due to what he put down to multiple electrical issues.
However, Yamaha said in a statement on Thursday that Vinales' actions "could have potentially caused significant damage to the engine" and have withdrawn the Spaniard from the 11th round of the championship.
Yamaha's decision was taken after "an in-depth analysis of telemetry and data over the last days".
Vinales, who races alongside championship leader Fabio Quartararo, will not be replaced by another rider at the Red Bull Ring.
The nine-time MotoGP™ race winner announced in June that he is to leave Yamaha a year early at the end of the 2021 season.