Michael Mosiman is from Sebastopol, California — the western Sonoma County wine country, redwood-forested rolling hills an hour north of San Francisco. His 250SX win at San Diego in 2022 validated everything his lap times had been promising for years — fastest in practice, fastest when it counts.
His career has been defined by a familiar pattern in this sport: flashes of brilliance interrupted by injury. The speed has never been in question. At multiple rounds in his career, Mosiman has posted the fastest practice times, only to have race-day illness, crash, or mechanical issue prevent the result from matching. When everything aligns, he is a legitimate podium and win threat.
"I know I can run up front. I've proven it. I just need everything to come together on race day."
— Michael Mosiman · Monster Energy Yamaha Star RacingThe 2025 Breakthrough and 2026 Setback
His 2025 season with Star Yamaha was his most complete — multiple podiums in both Supercross and Pro Motocross, including an overall podium at the RedBud National. Then, while testing before the Birmingham round in 2026, Mosiman crashed and dislocated his elbow with additional bone fractures. Another injury. Another comeback required.
Monster Energy Yamaha Star Racing
Star Racing has produced champions across nearly three decades of American professional motocross. The program has won in conditions no other team matches, with factory Yamaha machinery and a team management group that has developed dozens of professional careers. For Michael Mosiman, the Star Racing environment has provided the structure and support needed to convert raw speed into professional results.
Yamaha Motorsports →Always Coming Back
When Mosiman is healthy and on the gate, the 250SX West class gets more interesting. He brings a technical style — the product of years of development in Star Racing's world-class training environment — and natural speed that the stopwatch confirms every time. The comeback from the 2026 elbow injury will bring him back to a team and a program that never stopped believing in him.
✦ Michael Mosiman — Career Highlights
- San Diego 250SX winner — 2022
- RedBud overall podium — 2025
- Multiple Supercross podiums
- Sebastopol, California — Sonoma County wine country
- 2026: Dislocated elbow + bone fractures before Birmingham
- Monster Energy Yamaha Star Racing factory program
- Multiple injury comebacks throughout career
- YZ250F factory machine