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I have a 1992 Kawasaki ke 125 ,I have changed the spark plug, cleaned the carburetor, and cleaned the piston, there was Rust on the sides keeping the piston from started up and ran two days ago,I rode it down the block.but the whole time it sounded like it was going to die.and now it won't even start back up. What do I do now??

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Pull the plug and check its condition, you probably are dislodging stuff from the lower end of the engine similar to what your piston sides looked like or worse.
check if you have compression, the rings may be sticky and or stuck in the piston.
double check that there's fuel in the carb bowl, and not lots of stuff disturbed from the tank and now in carb. not the first cleaned carb being refilled with crud from the tank.
try looking for vacuum leaks, carb leaner works well if it is running by spraying small shots around carb mounting boots/flanges.
you also may have poor main crank seals

Posted on Jul 23, 2013

  • William Jul 23, 2013

    I'm getting clean mixed gas, head gasket is dad got it running awhile back for my neighbor, it was his, then I worked for him for it.but before that after my dad had it running real good, my crack head neighbor messed with the carb


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Posted on Jan 02, 2017

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SOURCE: kawasaki kmx 125 2002 wont start

To me I want to know how old that gas is. If it smells like old paint or stale at all you need to rid the complete system. Then you need to take your carb. off and take it apart and clean it and all the jets, since you said there was sand in the gas tank.

Posted on Jan 05, 2009

  • 3567 Answers

SOURCE: i have a dt 125 lc 1987 just changed the piston

You have several possibilities;

  • The slide in the carb is not closing properly,
  • The throttle cable is stretched or kinked so that the cable is binding up.
  • The rubber seals mounting the carb to the manifold are old, hard and cracked. This lets extra air into the fuel making it lean which makes the engine go nuts. The original seal was broken when the carb was removed from the cylinder.
  • The reed valves are cracked, chipped or broken.
  • The new head gasket is not sealing properly and is sucking in air. You DID tighten the head bolts in a pattern, a bit at a time, and you DID use a torque wrench, didn't you?
  • The timing is pre-set, you have no points or condenser. You may have messed up the timing by trying to adjust it.
  • Can I get a “very helpful” rating on this answer?

Posted on Aug 12, 2009

Testimonial: "very helpful"

  • 3567 Answers

SOURCE: why does my ttr 125 not start then backfires?

Your bike has a diaphragm on the carb. Every time you twist the throttle a shot of gas goes into the cylinder. Chances are you are flooding the engine by twisting the throttle too often. Flooding can create a backfire. Start with a clean dry plug. Twist the throttle once then leave it alone for about six kicks. Repeat the process if needed.

Posted on Aug 13, 2009

Testimonial: "thanks i it doesnt start well unless i rev it but i tried turning up the idle and its fine now and doesnt backfire as much thanks again"

  • 197 Answers

SOURCE: 2003 suzuki rm 85 wont start cleaned carburetor,

if it has reed valves, check them for either cracked or broken pedals. also try starting it with the air filter removed. also make sure the choke is operating properly

Posted on Oct 22, 2009

  • 115 Answers

SOURCE: 1974 Kawasaki KE 125 want spark, but has spark

you can trace if a coil is bad by using multi tester and check the voltage coming from it.,the volts shall be not less than six ( 6)Volts.But the problem if you dont have a multi tester?Ok,kick the starter of the motorcycle and at the same time slightly ground the wire from the coil into the cranckcase..,and if you can notice that the spark will produce a burning sound with a blue fire ,then your coil is still good.
By the way,i think your problem is not in the coil itself but either of the following:
1. The ignition coil is bad.
2. The condenser have a leak or shorted.
3. the contact point.Maybe it needs to replace or just needing a good adjustment of the "timing".
4. Or,just simply change the sparkplug.

Posted on Nov 27, 2009

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1 Answer

Iv got a 1978 kawasaki ke 125 .. How do i disconnect the oil pump/injection system if its a two cylinder? and im wondering when i got the bike it has two spots for spark plugs but theres a bolt in one...

A 1978 KE125 has only one cylinder. The head does have two spark plug holes. From the factory there is a bolt in one of the holes. The thought behind having two holes is that two plugs can be in the head at the same time so that the rider can just move the spark plug wire from one plug to the other during a race without needing any tools or waste time trying to install a new spark plug. If for some reason you want to disconnect the oil pump, you would drain the oil tank then put a plug on the oil pump infeed line.

Aug 22, 2011 | 1978 kawasaki KE 125

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Need rings!! for 1976 kawasaki ke 125

It looks like Babbitt's has the parts. Pistons and rings are sold in 3 sizes; standard, .020 oversize and .040 oversize. I would suggest you have the cylinder bored and install new piston, rings and needle bearing.
Go to
You might want to install new crank bearings and seals as well but that involves an engine teardown. Please rate my answer. Thanks.

Aug 04, 2010 | 1976 kawasaki KE 125

1 Answer

I have a Kawasaki KE100 1978 with no spark, and a new magneto that shocks me and a new spark plug but still no spark

You may have spark, but it may be firing at the wrong timing... be sure to check engine timing. Also if you bike is a 78, it could have ignition points that are dirty. The ignition points are located under a side cover and there will be a small camshaft that they ride on to open and close. The points should be opening a small amount to allow the spark to fire. You can take some very fine sand paper and carefully slide the paper between the closed points to clean them, afterward, take a clean business card and pull them thru the points to clean any debris left from sanding them.
Then see if you get spark.

Feb 09, 2010 | 1978 kawasaki KE 125

1 Answer

My 1978 125 will kick off some time and run for a min then die

Dis-assemble the carb and clean it. Clean the air filter and install a new spark plug.

Feb 08, 2010 | 1978 kawasaki KE 125

1 Answer

I have a kawasaki 125 dirt bike it gets fule and sparkes but will not run pull started it and sat and kicked for hours what could be wrong

Bottom line is it needs some attention. Remove the tank and flush out the rust, water and any trash in it. Remove the fuel valve assembly from the tank and clean the wire mesh filter screen. Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then thoroughly clean and replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road. Please top rate this answer.


Jun 28, 2009 | 1976 kawasaki KE 125

1 Answer

It cuts out at high rpm but the plug is fine.

Pull the spark plug. If the porcelain cone is whitish then change the main jet to a higher number i.e.. 178 original main jet changes to a 180 or a 182 if needed.

If the porcelain cone is blackish or sooty then change to a lower number i. e. 178 down to a 175 or 172.

Apr 22, 2009 | 1977 kawasaki KE 125

1 Answer

Kawasaki ke 125 runs for about 2 minutes stalls then when kicked over will idle sometimes but not take throttle left for a while will run again for 2 mins

Go to the dealer and ask for the stock plug for your bike. Check for spark on the new plug then install the plug.

Remove the carb , dissemble it and clean the varnish out. Remove the petcock, ( gas valve ),water trap and clean it out. Next let one cup of gas flow into a container. Any water or rust in the bottom of the container? If any rust was in the water trap or the container then purchase an inline fuel filter to eliminate the rust getting into the carb.

If cleaning the carb yourself does not do the trick then take it to the dealer and have them clean it and install a car kit. This should eliminate the carb as a problem. Get a new air filter and install it.

Now you have spark, gas and air. If it still will not start it is likely that you need new crank seals. On a bike that old you may well need new crank bearings as well.

Please rate this solution. Thanks!

Mar 21, 2009 | 1978 kawasaki KE 125

1 Answer

Spark plug keeps oiling up

First check the engine compression with a gauge.It should be over 100psi.If not either the bore job was off or the rings either broke,stuck or were not installed correctly.Either way I would let who ever done the work know.The oil ring could be on wrong and still have compression too.

Jan 24, 2009 | 1983 kawasaki KE 125

2 Answers

Can't keep running seems to flood out 1978/79 kawasaki

check the timing it sounds like your problem is there

Jan 13, 2009 | 1976 kawasaki KE 125

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