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  1. #1
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    Compression, Fuel, Spark - NO START!

    Ok.. I am having trouble with my 1993 Kawasaki KX 125. It has fuel, plenty of spark, and also good compression.

    This is what it does:

    Kick it many times and every now and then it will start.. run for about 3 seconds revving up with the throttle, then it won't respond to the throttle anymore and completely die out. After millions of kicks it will eventualy do the SAME EXACT thing all over again and run for the same amount of time, same everything.

    Spark plug is new, I have replaced the Coil, CDI, and all wiring. It has a fat blue spark. Carb has been taken apart, every passage cleaned out, float adjusted properly, etc. Topend is not low on compression. Airfilter is clean, and not clogged. Bike won't start even if I took it off.





    This bike has me STUMPED!

    If anybody has an idea what could be the problem... PLEASE help me

    Thanks




  2. #2
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    Just went throught this...Compression, Fuel, Spark....that is all you need to start a bike. I did the same, checked the float, cleaned my carb like four times...and eventually i figured out that it was not getting fuel from the carb.. I did a test..took about an inch worth of gas from a straw and put it down the spark plug hole. if it starts, its your carb. but if you have compression, and spark, it will start. I would go straight to your float. Take off your bowl and look at it as if it where on the bike and push the float up and down. (as if the bike where filling with gas or emptying) look and the little slide and when you move the float up and down make sure that the slide moves. if its not moving then its not gonna let fuel through. My carb was getting fuel but barley, and not enough. Which made me kick and kick and kick with nothing. hope this helps.




  3. #3
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    If I sprayed starter fluid into the cylinder, shouldn't it start?

    See the thing is... the cylinder has plenty of fuel in it, and when I take out the spark plug, it comes out looking brand new, yet very wet. I blow it off with a air compressor, put starter fluid in and kick and it doesn't start. I check for spark right after and before that and it still has a nice fat blue spark. Every now and then I'll get lucky and it will run for 5 seconds. I thought it was intermetent spark, so I replaced all of the electrical components. Through testing with a meter and visually, I am getting a nice strong spark.

    Any ideas now?




  4. #4
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    i don't know..heh..thats weird...but it still sounds like a fuel problem. becuase you have everything there..and the only reason i can see that the bike is dying is because its not getting enough fuel. Call a Kaw Place and talk to a service guy and describe the problem..take out your jets and look through and make sure they're not clogged. I dunno. But i would tottaly start with the carb. This does sound exactly like my prob though i had..i swore that i have everything adjusted and cleaned but i didn't. Try gas instead of starter. like use whats in your tank. anyone else have any ideas?




  5. #5
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    I'm gonna mix up a fresh batch a fuel, and inspect the whole reedvalve system. That's about the only thing left that I haven't messed with.

    Wish me luck!




  6. #6
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    if it starts with starter fluid then its a fuel delivery problem

    if it starts by pull starting it then its a compression problem-do a compression check

    also if your plug is wet/gas fouled it will NOT start.turn off fuel, hold it wide open as you kick it and help clean out the cylinder. put in a new plug, turn on the fuel, hit the choke and kick away.
    good luck




  7. #7
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    Doesn't start with starter fluid

    Starts by itself (Starter fluid or not) occasionally then runs for the exact same 5 sec amount of time then bogs out.

    Plug comes out gas fouled/wet, and I blow it off so now it's dry. Wouldn't it work fine now? Do I really need a brand new one?




  8. #8
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    Have you checked the flywheel key




  9. #9
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    Just what exactly is the compression actually reading. A gauge will give a precise number, and if the gauge is any good it will be accurate as well. Your foot will give an imprecise, inaccurate guess. Seized pistons can feel like compression is good due to the resistance in the cylinder that must be overcome, even though a compression tester will show the compression is too low to run.

    An engine actually needs slightly more than spark, fuel and compression to run. It requires a strong enough spark, at the correct time, to ignite the correct air/fuel mix delivered by the carburetor, a properly sealed crankcase (2 stroke), and strong enough compression in the cylinder to allow it to run correctly. When any of these is off, the bike may not run correctly, if at all.




  10. #10
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    It is definetly NOT seized. The topend is perfect.

    I changed the fuel and checked out the reeds. Bike now starts with throttle closed and choke full on after a few kicks. Bogs a whole lot when it starts, blows out clouds of smoke, and sprays gas out of the exhaust. Won't start with throttle open or choke closed.

    Ideas on what to do?




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