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I have a 125 kaw kx 2 stroke good power on low end power band strong on top end bike dies out from low to high in middle replaced piston blewout jets checked reed valves messed with carb tuning cleaned exsaust butterfly nuthing helps

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Pull the slide out and then move the clip on the jet needle one notch lower. Also try two notches to see which helps most. This will richen the mix in mid-range.

Pleas rate thia answer. Thanks v222407! :)

Posted on Apr 15, 2009

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Bike spits and sputters at top end


Hi, Johnny and the usual suspects are:
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2. Enrichener valve not seated or leaking.
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4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Cagiva mito blowing up piston holed at top n melted bad at exhaust side


Hi, Hendo a garage is a shelter for motor vehicles that being said take your bike to a professional, any Cagiva technician worth his salt knows that a hole in the piston on your make and model motorcycle is caused by extreme heat usually due to the wrong spark plug heat range, monster intake leak or carburetor jetting to lean. For more information about your issue please visit the websites below. Good luck and have a nice day. KTM 125 SX Top End Overhaul Part Two stroke top end rebuild
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1 Answer

Hello I am having problems with my 2004 kawasaki kx 250f. The biggest problem of it all is that I am afraid of running the bike because I do not want to blow a head gasket. When started up the bike...


Starting problems on your bike are usually related to twisting the throttle too often. Remember, the carb has a diaphragm pump in it that gives a shot of gas each time the throttle is twisted. That means the engine can flood quickly if you get happy on the gas. Gently use the kickstart lever to ease the piston just past top center on the compression stroke. Now give a good strong kick. Repeat as needed.

Jul 01, 2011 | 2004 kawasaki KX 250 F

1 Answer

I recently put a new head gasket on my '99 KX 2 stroke. It blew the head gasket and drained all the radiator into the lower end. It was a pain to clean out, but I reassembled everything, took the bowl...


Hi, Brandon nice novella, it could be a funky power valve and they are moderatley easy to clean/repair and you will need the free manual provided below as for a gasket/o-ring you may be able to reuse the old one if you are careful removing it, worse case scenario you can always make a gasket out a cereal box and use high temp silicone for more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Feb 28, 2017 | 2003 kawasaki KX 125

1 Answer

STUCK PISTON ON 65KX KAW


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

Nov 30, 2010 | 2003 kawasaki KX 125

1 Answer

Need gas-oil ratio on 2004 kawasaki kx 125 2 stroke bike


32:1--40:1 any less than 40:1 And you take risk of damaging engine(crank and top end),Any more than 32:1 and it will smoke real bad and foul spark plugs alot.....

Aug 01, 2010 | 2004 kawasaki KX 125

1 Answer

I recently rebuilt the topend on my son's 01 kx 100 new cylinder and all. The bike runs great at low to mid rpm but when up in the topend range of the power band it looses all power and runs very rough! My...


I'd bet you 10 to 1 it's not the coil. It sounds like it is starving for fuel and needs a carburetor adjustment. When you rebuilt the top end, did you put a bigger jug and piston? If so, your problem most definitely is the carburetor needs to be re-jetted.

What caused you to rebuild it? Did it seize, or quit running? Was it losing power before the rebuild?

That's where my money is but if you still believe it is the coil, you can check it with a spark checker. This is a handy little tool you can find at AutoZone, Harbor Freight, etc. It's a one piece tool that connects between the plug and the coil. The plug stays in but you remove the wire and put the checker on, one side connects to the plug, the other side you connect the plug wire. There is a light in the middle that will flicker when you crank the engine if it has a good coil.

Put the checker on and start the bike and see if you are losing spark...if the light stops flickering at top end, then you do have a coil issue...but like I said before, having seen this problem hundreds of times, my money will be on re-jetting the carburetor.

Nov 08, 2009 | 2001 kawasaki KMX 125

1 Answer

Engine problems on a kx 250 2 stroke


On a 2 stroke bike cause of smoke is due to excess oil in the fuel oil mixture, incomplete combustion in the cylinder or the engine oil finding it way in through the piston rings into the firing chamber. Check the oil levels and clean the plugs, which must be black in color by now, so replace if possible and if engine oil is low, the change the piston rings. Also look up the carburetor jets/nozzles are clean and the engine gets the correct fuel/air mixture by adjusting both fuel and air jets(turns)...sodeep

Jun 30, 2009 | kawasaki KX 250 Motorcycles

2 Answers

Low power from low to middle rpm


Two strokes exhuast is very important for low end volumetric efficiancy. Check for cracks leaks and even crushed expansion chamber will effect low end performance.

Feb 09, 2009 | 2003 Yamaha YZ 125

5 Answers

1997 yz 125 wont start, please help


2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

Jan 12, 2009 | 2003 Yamaha YZ 125

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