Question about 2003 kawasaki KX 125

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00 kx 125 what could be causing a bog on hard acceleration has good compression starts first kick hot or cold to eliminate bog must seat mixture screw

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To seat the screw it goes all the way in but only 2.5 turns out

adjust more if needed

good luck.

Posted on Mar 26, 2011

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My kx125, can still start it and ride it without a lot of compression, it only gets compression about half way towards the bottom when kicking it, but it does start.. Any ideas??


Hi, Colin you may have a kicking gear engagement issue, do a compression test when the engine is at operating temperature should be around 125-130 psi. for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Minimum Compression Required
Curing 2 cycle engine problems
Small Engine Repair Compression Test on 2 Stroke Craftsman Chainsaw
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf

Mar 26, 2016 | 2003 kawasaki KX 125

1 Answer

Kx 125 sputtering in high rpms


check and make sure choke is opening all the way,if it is only opening part way could explain why you don't need to use choke at all to start and then at higher rpm's it is not getting enough air causing it to basically choke it self out.

Apr 03, 2013 | 2003 kawasaki KX 125

1 Answer

Bike wont kick start or idle , it will coast


first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle.
When warm, no choke, and a little throttle when kicking.

May 12, 2010 | 2003 kawasaki KX 125

1 Answer

What is the Kawasaki kx 125 compression i did test tested 135 with cold motor is this what it shuld be i get real bad bog at low rpm


anything over 120 on compression test is ok. anything under 120 and its time for top end. and for bog you might try cleaning carb.

May 09, 2010 | 2005 kawasaki KX 125

1 Answer

I need to know what the compression needs to be


Air filter clean, hold throttle wide open while kicking...at least 100 psi. 130-150 is good.

Apr 06, 2010 | 2003 kawasaki KX 125

2 Answers

My 2003 KX 125 will not start. Replaced all jetting down one size mixture was to rich 400 main, 35 pilot, needle pistion 2. Also clean the carb found no problems with build up or reed damage. Check fuel...


have the fuel **** on unhook the line into the carb make sure fuel pures. if it does reconnect. next there is a drain screw on the bottom of the carb unscrew it a few times make sure fuel flows from the bottom of the carb if it don't check your needle and seat make sure the ruber on the end of the needle isn't swelled because of the ethenol they are using in the gas now. if you have fuel. try holding your hand over the back of the carb to plug it off completely and have someone try to kick start it a couple of times. if working corectly your should get fuel on your hands and might crank. if so there is a cloged fuel mixture port etc hope this helps,

Mar 10, 2010 | 2003 kawasaki KX 125

4 Answers

Wont start by kick start but will by pull start


sounds like your idle jet is clogged, remove your carb and clean idle jet cause it won't idle or kick start without it...good luck to you friend...Tim

Jun 05, 2009 | 2003 kawasaki KX 125

2 Answers

Bogging 1994 Suzuki RM 125


i have the same problem on the exact same bike

Apr 07, 2009 | Suzuki RM 125 Motorcycles

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