How about a cut and paste of this discussion. I'm not a member there and while I like that KTM has continued the 2 stroke evolution, I don't want to join there. I've read a lot about the KTM 550's and they were the most powerful, but are very rare and hard to get parts for that are expensive also(like all KTM's parts--expensive). I love big bore 2 strokes and own a 85 cr500. Great bike with tons of power, but the mags back in the day did rave about the KTM's. Too bad they didn't sell more of them. If you really want the most powerful big bore then look at the Zabel motors. I'm happy with my 85cr500 and honestly see no reason for more power, but I'm not a pro or a hillclimber. I love all the big bores, but only own one. Long live the dinosaurs!!!