kawasaki KX 125 - Recent Questions, Troubleshooting & Support

check your VIN number! The eighth number will tell you what year your bike was produced.

Sounds like they were put in in the wrong place.. swap them..tighten with an air tool...the washer with the splines goes between the basket and the inner hub..the big washer goes behind the clutch basket.(goes on the shaft first)

Hey Fata.... PLEASE take the carb(or the whole bike) to a QUALIFIED PROFESSIONAL... it will save you time and effort..carb work is NOT for amateurs..there is A LOT more to tuning/cleaning/setting a carb than a screw or two..

jet size and exhaust muffler are not connected failing at high rpms indicates a problem coil or capacitor or failing ignition control module if it has points or cdi ignition it could be from worn shaft that is wobbling at speed causing the miss

Hey Steve Put a new spark plug in first... ... Sounds more like a fuel delivery issue... (the jests are in the carb and are considered one item). IF THE ENGINE HAS BEEN MODIFIED - FIND A REAL PRO THAT KNOWS HOW TO JET AN ENGINE - I CANNOT STRESS THIS ENOUGH - THIS IS not FOR AMATEURS!! Make sure you have fuel flowing to the carb..(turn the gas off at the petcock - remove the gas line and then turn the gas on -- if its flows quickly and a full stream - turn the gas off, reconnect the gas line. Now, on to the carburetor... IF you are a great mechanic, you can clean and set the carb..IF NOT - take it to a qualified pro!! After the carb is cleaned and set.. it should run great... Please reply to me when you are done with these steps..

Check VIN location at this page: http://vin-location.com/

for kx125, that kind of problem i kind of remember my friend just like that too. so clean everything inside . so u have to changes the valves and also the lifter then do the piston pin too,.also chick the rod if in good! that's it for now then when u do that tell me what going on!

usually 2 strokes foul plugs when the oil is two strong in my old bike i mixed the gas 40:1 try that and if it dosent work i would take it to your nearest dealer and get them to check it out

Check gaskets, seats and hoses

clean air filter, spark plug and change oil, adjust valves if possible or noisy, done!

check your carb float pin.

If you own a KX125, you need to own a factory service manual!!