How do you select a 2 stroke bike instead of a 4 stroke.

Lol its 4-strokes. And depending if u pick a bike from lites or mx class, u either have to pick a 250 in the mx class, or a 125 in the lites class. Those are the 2-strokes.

Hmm I wonder how a 3-stroke engine would work. It would have to have some weird symmetrical/mirrored cylinder design with valves and spark plugs on both ends, with a mechanism to activate and deactivate either of them after every 3 strokes. Of course you can't have a connecting rod, so the piston would just have to be suspended in there, with the power transmission happening through induction or something, which of course would make it a very wimpy engine. But anyone wanna build a prototype??

Sorry, I know it's just a typo :P

Well u just bike ur style if u like a bumble bee sounding bike(2 stroke) or a bulky bike (4 stroke) 125's in the lites are 2 stroke and 250's in the lites class is a 4 stroke (look at the pipes and names for the stroke) (2 stroke big pipe) (4 stroke little small pipe) and in the big boys its 250's are 2 strokes and the 450's are 4 strokes