Ok this is my opinion on the whole 250/150 argument.. its easier to do OK on a 250 than a 150, (don't need to get as much drive on 250 because more power so they can afford to make more mistakes) right at the front however I think there isnt much in it (maybe not the case for CBR's, by the sound of it are a lot faster).
At the end of it all the 150 rider has learnt more about passing, and the 250 rider has learnt how to get away with making errors. If you wanted to go F3, you could get a four stroke if you like, if you're going to go two stroke definately a two stroke 150. After that it's all up to personal preference
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