Fresh from the unveiling of the all-new 2018 YZ450F in Ottobiano, Italy, earlier this month - Yamaha Motor Europe and Wilvo Yamaha Official MXGP are pleased to announce that Wilvo Yamaha's Arnaud Tonus will race the all-new 2018 machine at the MXGP of Czech Republic in Loket on the weekend of July 23rd.