Hey everyone, I found race specs on another forum.
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1. Suzuki Quadzilla LT500 ---------> 51srwhp / 390lbs = 0.1308 horsepower per pound
2. Cannondale Cannibal -------------> 38srwhp / 375lbs = 0.1013 horsepower per pound
3. Yamaha Banshee ------------------> 37srwhp / 386lbs = 0.0959 horsepower per pound
4. Suzuki QuadRacer 250R --------> 31srwhp / 327lbs = 0.0948 horsepower per pound
5. Kawasaki Tecate 4 ----------------> 33srwhp / 339lbs = 0.0944 horsepower per pound
6. Honda 250R --------------------------> 31srwhp / 329lbs = 0.0942 horsepower per pound
7. Bombardier DS650 ----------------> 42srwhp / 465lbs = 0.0903 horsepower per pound
8. Yamaha Raptor 660R -------------> 35srwhp / 399lbs = 0.0877 horsepower per pound
9. Suzuki Z400 / Kawasaki X400 -> 32srwhp / 370lbs = 0.0865 horsepower per pound
10. Honda 400EX -----------------------> 29srwhp / 374lbs = 0.0775 horsepower per pound
11. Polaris Sport 400 ------------------> 31srwhp / 481lbs = 0.0644 horsepower per pound
12. Yamaha Blaster --------------------> 19srwhp / 320lbs = 0.0594 horsepower per pound
13. Yamaha Warrior -------------------> 22srwhp / 397lbs = 0.0554 horsepower per pound
14. Polaris Scrambler 500 2WD ---> 29srwhp / 525lbs = 0.0552 horsepower per pound
15. Honda 300EX -----------------------> 17srwhp / 377lbs = 0.0451 horsepower per pound
16. Kawasaki Mojave -----------------> 17srwhp / 379lbs = 0.0449 horsepower per pound
17. Honda 250X -------------------------> 15srwhp / 351lbs = 0.0427 horsepower per pound
18. Honda 250EX -----------------------> 13srwhp / 349lbs = 0.0372 horsepower per pound
19. Suzuki QuadSport 230 ----------> 11srwhp / 309lbs = 0.0356 horsepower per pound
20. Wal-Mart PowerWheels ---------> 0.5srwhp / 50lbs = 0.0100 horsepower per pound

Top speeds
Banshee:77.7 mph
Raptor: 76.9 mph
DS650: 76.1 mph
Cannondale: 75.1mph
400ex: 66.8mph

1/8 mile drag race

Cannondale:8.89 seconds
DS650: 8.98
Banshee: 9.19
Raptor: 9.28
400ex: 9.66