A long time ago.... I had a Suzuki DS100.  1979 model or so.  Those things were massive back then and I was about 5'5&quot; when I got it and had no problems.  The newer bikes are leaner and more powerful I'm sure but I don't know how they are for seat height in comparison to that old thing.  It felt underpowered to me but I had no problem launching it... trying to do crazy tricks with it was pretty much out of the question though because it wouldn't stay up in the air very long.  I only ever hurt myself once (over the 3 or 4 years I was able to keep it in good shape - parts were hard to find) when I landed and my foot slipped off the peg - broke a bone in right little toe... it only hurt when I walked and it wasn't pure agony unless I tried to run.  I don't think it healed as good as it would have if I would have just not walked on it for 2 weeks :P
[url=http://videosean.gotgeeks.com/1978_DS100_yell_Aus_720.jpg][img:2f95dd277d]http://videosean.gotgeeks.com/1978_DS100_yell_Aus_500.jpg[/img:2f95dd277d][/url]
DS 100 1978
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Engine type: 98cc air-cooled single-cylinder 2-stroke, piston and reed valve. 
   11 hp (8.2 kW)/ 8,000 rpm, 10.1 Nm (1.03 kg-m)/ 7,000 rpm.