I just purchased a 93 kx 125 and it wus runnig fine until i tried to open it up all of a sudden while im riding the bike just locked up nd cut off i have no idea why

Try Cornwall Kawasaki's website and go onto parts diagram for your model and year, good exploded views.

Did you ever get to the bottom of this? My son has the same problem

Just cause the piston looks fine dosent mean the rings are still good did you do a compression test if you don't have one buy one they are great to have with 2 stroke bikes put the cylinder head back on and cover spark plug hole with finger it should first **** a bit then should blow finger off the hole the compression should be greater than 120 psi of a 125 not sure on the 250 rule of thumb if you have less than 120 your piston or rings is pooched..

if the bike is to small for your the BEST thing to do is move up in bikes, if you can ride a 85 you'll have no problem on a 125, if your feet dont reach ground thats fine your are not on the ground when your flying in the air over that 100 foot double.
Good luck
M.Woodring

you need ajust the floats in the bole to let more fuel in

It may be a safety switch in the clutch lever or bike stand switch being a bit sticky or broken wire in the wiring harness near the steering head that bends alot.

Check for spark, compression, replace plug.

is it loosing water mate and the mix is 32-1 mate and get some good oil if it loosing water the head gasket has gone if it not this ckeck the jeting on the carb good look

im pretty sure that the bike is a all in one menin that oil in tranny is same that flows in motor

hi mate i got an kx85 but haver never come accross this problem check the reed valves are not sticking and check to make sure the exhaust port is clear not full of carbon build up also check air filter is clean not cloged good luck