honda 250r

because its one of the best performance quads that's been made in the past 20 years...and still can hold its own today
 
because the 250r was god of its time.. its frame geomitry, and suspension were ahead of there time. HUGE aftermerket back then and a even bigger after market for them now.
they were the most reliable of the big 3 250 2 strokes.

plus they had a good start and a head start in the sport/ race atv market... the first 'race' atv was the 81 honda 250r atc 3 wheeler. which made its maden run in the 1980 baja as a pre production run.. so they had a 304 year jump on yamaha and suki and kawi. lots more r&d time