Top 20 2003 kawasaki KX 125 - Page 4 Questions & Answers

piston kit, wrist pin bearing, top end gasket kit and a honing tool to clean your cylinder is about it I would probably buy new air filter and spark plug if I was doing it, but not essential ?

175mililitars per leg!

Who put the new crankcase seals in your bike? Sounds like your sucking oil out of your crankcase if it is blowing all that smoke.just fixed Cr125 doing same thing. I’m happy to assist further over the phone at https://www.6ya.com/expert/michael_18b4936ebf017b21

start with a new spark plug,if the bike sat for along period of time ,gas can gum up the carburator

hope this helps

o.k......you can try checking you have the correct plug(heat range)and nice blue spark,check your air cleaner.What about your engine oil.Is it the correct viscosety(weight)?.Are you running oil injected or premix?You could be running rich.Also make sure idling isnt set to high and have you the correct gas?These suggestions are just a start to check with.

700cc or 0.7 litres of oil

run 14 psi on hard pack and in dirt with a lot of traction. I run 12 when its a little bit slippery, and 9-10 when it is greasy.

i know it says 30 psi on there tyre but thats to much

John

the fuel to oil ratio is 32. to 1

It just need new oil seals, but make sure that you don't put to much oil
back in, or it will be very hard and could blow the seals again,
hope this helps

.7 liters or 700 cc's

sounds like a siezure, tear down the top end and inspect it!

hopefully its just the piston and not the crankshaft.

remove the piston and see if the rod has nice smooth movement, and no up and down movement on the big-end bearing

Now, you need to find out what caused the siezure, so you dont sieze it again after its rebuilt

Unhook both ends of your clutch cable if it is binding at all replace it. If the lever on the motor does not go all the way back to riding position (disengaged clutch position). You may have to disassemble the motor to check for a broken spring or damaged clutch engagement mechanism.

sounds like the inner seal of water pump is bad and should be replaced. really not that hard to fix

I would use a motorcycle gearbox oil weight 10/40 Hope this is what you needed.
Deke

The KX 125 is a two stroke and is lubricated with the fuel.
A good quality synthetic two stroke oil will be best in my view as the engine is used by many manufacturers including Aprillia in their RS 125 recomend it. Halfords do a good few types. It has a pump that meters the oil into the float chamber of the carbourettor, very cunning! Unlike my 1956 Lambretta LD150 that used 18 to 1 petrol to oil mixed as it goes into the fuel tank. Yours uses about 45 to 1.

if your fouling plugs then either your fuel/mix ratio is off ( should be mixing 32:1 ) (or) your bike is running to rich( getting to much fuel to engine) which means you need to rejet the carb....example:( if you have a #50 jet,you need a #48 or 49) to install a new jet, #1.)remove carb,#2.)remove the bowl(4-screws),you will see the jet and #3.)unscrew jet and replace with smaller # ( number is stamped on the jet.) you can get jets from local motorcycle dealer( but they will probably have to order them). or go online to bikebandit.com enter your bikes year,make,model,ect.and just order from them........

if your still fouling plugs then you still need to go with smaller # on main jet...are you spooging allot out of pipe and muffler? then your to rich still,smaller jet size!!!! 32:1 is a good mix ratio

dont think its a fluid issue. more like a clutch adjustment either at lever or in mid section of cable if that doesnt fix you might have to replace either clutch cable or clutch disks

muffler bearings definately

i hope you are talking about tire tubes, check the rim for rough spots, aluminium rims will corrode have sharp edges, use emery cloth on the inside of the rim to remove any burrs, check the spoke cover rubber boot for tears , and inflate the tire to max pressure , it may be slipping on the rim and tearing the valve stem