yeh agree with motoxxx. get the bike first see how the bike goes and then when you want a bit more power start looking into all the mods. i doubt very much you will be able to do the porting and polishing urself unless you have a lathe. so i wouldnt even worry about it unless your going to put a couple hundred dollars into the motor. first mods are what the guys have said. ngk plug, oil, uni filter and then if you want it to rev harder and irk or cdi rev box.
ok for you guys who no the yx from the lifan which is the better motor no one has really answered this. which has the more power, which is more reliable, which is the better motor over all.
i would like to no this for my self as i am torn between the dhz 140 (lifan) or the dhz 150 (yx)
thanks guys.
LJFBO if i was you i would go for either the 140 or the 150 dhz. great value for money, u can get the off ebay, every thing you need for a first bike plus more, and they are in your price range.