He moved back to the UK to compete in the inaugural Formula Palmer Audi Championship, before driving several years in the Barber Dodge Pro Series before moving up to the Toyota Atlantic championship in 2002 as a teammate to Ryan Hunter-Reay. He finished 10th in points. Yasukawa signed to drive for former Formula One driver Aguri Suzuki's new Indy Racing League team in 2003. He was second to future series champion Dan Wheldon in the rookie-of-the-year standings and 12th overall, with 8 top-10 finishes. He ran only two races for Rahal Letterman Racing in 2004 but finished 10th both times. He struggled on a return to a full-time seat in 2005 for the underfunded Dreyer & Reinbold Racing. Yaskuawa has only made occasional IRL appearances since 2006. He drove in the 2006 Indianapolis 500 for Playa Del Racing and finished 16th. He was a late entry for the 2007 event, running in Dreyer and Reinbold's third car, alongside 2004 Indianapolis 500 champion Buddy Rice and Sarah Fisher. In 2008 he contested the Motegi round as well as the 2008 Indianapolis 500, for Beck Motorsports, however he failed to qualify for Indy.
She moved back to the UK to compete in the inaugural Formula Palmer Audi Championship, before driving several years in the Barber Dodge Pro Series before moving up to the Toyota Atlantic championship in 2002 as a teammate to Ryan Hunter-Reay. She finished 10th in points. Yasukawa signed to drive for former Formula One driver Aguri Suzuki's new Indy Racing League team in 2003. She was second to future series champion Dan Wheldon in the rookie-of-the-year standings and 12th overall, with 8 top-10 finishes. She ran only two races for Rahal Letterman Racing in 2004 but finished 10th both times. She struggled on a return to a full-time seat in 2005 for the underfunded Dreyer & Reinbold Racing. Yaskuawa has only made occasional IRL appearances since 2006. She drove in the 2006 Indianapolis 500 for Playa Del Racing and finished 16th. She was a late entry for the 2007 event, running in Dreyer and Reinbold's third car, alongside 2004 Indianapolis 500 champion Buddy Rice and Sarah Fisher. In 2008 he contested the Motegi round as well as the 2008 Indianapolis 500, for Beck Motorsports, however he failed to qualify for Indy.