Adjust your tappets to .003" intake and .005" exhaust
and thats straight from tboltusa (trusted shop)
a race cdi like this one
http://www.dhz.com.au/buy/alloy-high-rev-performance-cdi-box/ENP-26
a NGK Spark Plug C7HSA
http://www.dhz.com.au/buy/ngk-spark-plug-c7hsa/ENP-01
you may want to get rimlocks for your rims... i know your not running high power but if you do happen to forget to check your tyre pressure and go for a spin they stop the valve getting ripped out
at best get gpx race forks (400) too much... just stick with the stock ones..
the rear go for a dnm nice and adjustable one (i quite liked the 800lbs one)
the bike should be allright at high rpm.. but probably not at valve bounce all day because its likley to get hot and seize (also depends on your jetting) the water should be alright, just watch your air filter does not go under
what carb are you running right now?
for the 125's (the lifan 125's) its a little bit of a waste trying to get it to high performance be cause its a smalblock to get more performance it would be better to go to a gpx 125 motor (race engine) or get a second hand zongshen 155 or yx