On Monday 24 March 2008 Krummenacher was injured when he crashed his mountain bike while training on a snow-covered downhill run. Shortly afterward, he traveled to Jerez, Spain for the upcoming Spanish motorcycle Grand Prix where his injury was initially diagnosed as a bruised rib. On Friday 28 March 2008 Krummenacher was too ill to practice. He was subsequently taken to a hospital in Jerez where it was discovered that he had lost more than 3 liters of blood and he immediately underwent life-saving surgery to remove his ruptured spleen. In 2009, Krummenacher rode for the De Graaf Aprilia team, partnering Danny Webb.[2][3][4]
After moving up to the Superbike category for the 2017 season[6] which he finished in 16th place, Krummenacher made his return to Supersport in 2018 with the Bardahl Evan Bros. WorldSSP Team[7] scoring three podium finishes, including a win in Thailand,[8] in his first 4 races of the season.