Redline on 6th on a kawi 250 is abiut 160km/h and it takes a helluva long time to get there too. It literally takes about 5-6 seconds on a 600cc, while a 250cc takes about double. A 600 will go up to about 270 before topping out. Decide for youself, but know that a 250cc can easily keep up with 600s on windy roads as long as you keep your speed through thr corners and the people you are riding with don't go balls out crazy (200+) on every straight they see!
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