If you have ever read or been a part of anything dealling with a 500cc two stroke. You are already aware of the bad traits the 500cc two stroke has been known for. But just know this every bad trait you have heard or even read about is severelly exagerated. The power is tameable the vibrations forgetable once you open the throttle. This is where the CR and KX500af comes into play. The af makes you forget about old style handling, big bulky, soft suspension and weight of the 500cc. Even though the CR and KX500 steel chassi's are still lighter than the 450f now. Its funny really, back when men were men they tried to get the 500cc to be like a four stroke of today. Now they are trying to make the 450 run like a 500cc of yesterday. They strive for more power and less weight. Hello, the 500cc af's take care of all that.