MILLVILLE, Minn. -- Ricky Carmichael raced to his 10th victory in 10 races this season Sunday to clinch his third straight AMA Chevy Trucks U.S. Motocross Championship.

''It's really a great feeling to win another championship,'' the 22-year-old Honda rider said. ''I never dreamed when I started racing that I would be fortunate enough to be this successful.

''I've been concentrating so much on winning races that I really haven't had a chance to sit back and enjoy some of the records I've broken this year. Now I can really have fun at the final two races, even though I'd really love to finish out the season undefeated.''

Yamaha's Tim Ferry finished second, and Ezra Lusk of Team Kawasaki was third at Spring Creek Motocross Park.

James Stewart, the 16-year-old rookie from Haines City, Fla., won the 125cc division on a Kawasaki. It was his eighth win of the year and extends his series leader over Australian Chad Reed, who was second Sunday.

Results
250cc
1. Ricky Carmichael, Honda.
2. Ezra Lusk, Kawasaki.
3. Sebastien Tortelli, Honda.
4. Tim Ferry, Yamaha.
5. Nathan Ramsey, Honda.
6. Mike LaRocco, Honda.
7. Robbie Reynard, Honda.
8. John Dowd, KTM.
9. Sean Hamblin, Suzuki.
10. Stephane Roncada, Kawasaki.
11. Kyle Lewis, Honda.
12. Nicholas Wey, Yamaha.
13. Clark Stiles, Honda.
14. Damien Plotts, Honda.
15. Ryan Clark, Yamaha.
16. Evan Laughridge, Suzuki.
17. Keith R. Johnson, Yamaha.
18. Keith S. Johnson, KTM.
19. James Povolny, Honda.
20. Justin Brayton, Honda.

125cc
1. James Stewart, Jr., Kawasaki.
2. Chad Reed, Yamaha.
3. Brock Sellards, KTM.
4. Matt Walker, Kawasaki.
5. Ernesto Fonseca, Honda.
6. Branden Jesseman, Suzuki.
7. Christopher Gosselaar, Honda.
8. Michael Byrne, Honda.
9. Derrick Shae Bentley, Kawasaki.
10. Travis Preston, Honda.
11. Eric Sorby, Kawasaki.
12. Grant Langston, KTM.
13. Danny Smith, Suzuki.
14. Larry Ward, Yamaha.
15. Buddy Antunez, Suzuki.
16. David Pingree, Honda.
17. Justin Buckelew, Suzuki.
18. Billy Laninovich, KTM.
19. Steve Boniface, Suzuki.
20. Andrew Short, Suzuki.

Point Standings
250cc
1. Ricky Carmichael, 500. 2. Tim Ferry, 386. 3. Ezra Lusk, 347. 4. Sebastien Tortelli, 321. 5. Kyle Lewis, 277.

125cc
1. James Stewart, 429. 2. Chad Reed, 335. 3. Branden Jesseman, 325. 4. Ernesto Fonseca, 309. 5. Danny Smith, 251.