Sound Alert = 2-Stroke only! Jonny Walker & Nathan Watson shred KTM150s on a Red Bull training day VIDEOS - July 17, 2019July 17, 2019 Red Bull athletes shredding KTM150s around the IronWorks circuit in Middlesbrough on the first Red Bull practice day. Jonny Walker and Nathan Watson are looking forward to the second day which is at Kent's Sellindge MX on August 20. Sign up HERE