A 250cc may be more your speed if you want to do 70 easily. Generally I think a 125-150 does about 60-65mph very top end, not factoring in wind, hills, etc. A 250 is about 100lbs heavier than a 125-150cc, however. But it will get you up to 70mph on level roads.<br><br>I wouldn't take a 150 on a...