Oh, and the louder thing is strictly factual. Many people dislike the higher pitch noise of the 2 stroke, but the low frequency of the four stoke 1) carries further, and 2) is less directional. This leads to more complaints from neighbors and more track closures.
You're night cheaper twice. 1) cheaper to buy (by $2000), 2) cheaper to maintain.
Yes safer. Engine braking makes the front end on a four stroke dive-y when things go wrong. Ask Chad Reed.
Take it from a racer, Four strokes suck for anything but racing. The two stroke is 1)lighter, 2) cheaper, 3) safer, 4) cheaper to maintain, 5) quieter. 6) MORE FUN. The four stroke: 1) hides your mistakes, 2) has an unfair displacement advantage in racing (although that is changing). Do...