sorry for my english first is not my best language

i by a 2000 kx125 and the motor not run well the saleman said is the bad gaz and carb is durty sale mecheaper because that

after put new gaz not change
my question is

what compression i suppose to have???
what jetting size i suppose to have on the carb for a fist start and i rejet after
and the reed valve thesealer put another one on because ???? what best is on the bike or no one better the other

i suppose a rebuilt is to come after i check the compression because the kick start is ... easy to kick hihihihihi

thanks for your help

 

i have 10 pound off compression

i find the piston and ring used on the exaust side----- what cause that

and the plug porcelain was chip and i have ngk br9es??????

a lot off question whit no answer [:-]