I'm 5'6" and have no problem riding my Rap. The only problem you're gonna have on one is holding down the front end with your light weight.

 

im 6 foot and 160 something pounds and im fine on my raptor, i kinda started off with it too, i had a 89 fourtrax before my raptor. You just have to start off slow and take it easy, and i think that if you get a z400 or something, youll tire of it quickly cause youve said youve been riding for about 4 years, so id say go big and go for the raptor[img]i/expressions/face-icon-small-wink.gif[/img]

 

hey im 5,7 160 pounds and i want an up grade.. lol like a turbo raptor.. just take it easy at first... i went from a little Mohave to a raptor talk about a change.. i hit the gas ans the front end flew in to the air... what a rush... get use to riding on the gas tank lolol.

 

Question is at 5'6", 129lbs, if ya flip it, can you physically get it back upright? Your skill level sounds fine, just watch the front end, she'll buck ya off and on hill climbs stay high on the tank [img]i/expressions/face-icon-small-wink.gif[/img]

 

i'm 15 5'7" 120lb and i ride my yfz 450 just fine . the yfz is a bit smaller than the raptor but i fit perfictly on the yfz,)i've never riden a rator though)