If I were to buy a used dirt bike, it would be a two-stroke for many reasons. But the primary one is that servicing one is a fraction of what a four-stroke costs. Rebuild a CR500 for $400 including a new cylinder that can be bored out several times and it is running like new. Rebuilding a CRF450 would easily be a four-figure bill.
Imagine if they do get emission cleaned up enough what a literbike two-stroke would be like. An inline 1000cc two-stroke would probably make upwards of 200 hp and weigh 40 pounds less than a comparable four-stroke.
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