American Chopper

Fast turns:
Hold Black to drift.
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Burnout:
Press R + A and turn when in a burnout.

Hint: Avoid losing style points:
When you are on the delivery boy level, you can also use R (rear brake) to knock Cass off his bike. This also works with the front brake.
KISSfan1120.

Hint: Defeating Iron Horse:
When you are racing against Iron Horse, try to get close to as many cars as possible. This will earn 75 style points for each car you get close to without hitting. This will allow you to get more style points than Iron Horse. Remember you must stay ahead of him in speed.
NaPuNkKiD.

Do not crash -- you must have a perfect race. If you crash, you will lose and must restart. You also must come in first and have more style points than he does.
Ryan.

Hint: Avoid losing style points:
When delivering a bike and Cass and his gang appear, they will try to knock you off your bike by swerving in front of you. This causes you to wipe out, losing 200 style points and a large amount of your bike's health. To avoid losing style points, wiping out, and damaging your chopper, press R (the front brake). Cass or one of his friends will hit you, but they will fall off their bike and you will receive 150 style points.
Alastair Sullivan 2.