I have to agree with bear on this one, the 250 sounds good on paper, but you better believe they are heavier than the 150's. I think most of the 250's are also liquid cooled, which can be troublesome if letting kids ride all the time, as they don't know what to look for if something should go awry. I am personally going with an ATC 200s engine just cause I like gear boxes over CVT's in my yerf 150 frame, should be a hoot and still air cooled for simplicity.
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