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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Posted on Jan 02, 2017

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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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


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

2006 Kawasaki KX 250 pops at high RPM?


Hi, Bill if your carburetor or exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp build up of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
SPITTING is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean.
BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
KX 250 high rpm bog
High RPM sputtering bogging problem
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf
OEM Parts for Kawasaki
2005 Kawasaki KX250 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jul 27, 2012 | 2006 kawasaki KX 250

1 Answer

2006 Kawasaki KX 125 oil fuel ratio


Hi, Anonymous for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kawasaki, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Best oil to gas mixture for 00 KX 125
help kx125 fuel ratio
03 08 Kawasaki KX 125 250 Service Manual pdf
OEM Parts for Kawasaki
2005 Kawasaki KX125 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Mar 21, 2012 | 2006 kawasaki KX 125

1 Answer

2005 Kawasaki KX 125 exhaust black smoke


Hi, Wieczorekjoe your instrument gauges and lights can alert you to most electrical and engine issues they can not warn you about failed engine gaskets or seals so your engine has to resort to old fashion alert methods of colored "SMOKE SIGNALS" here is a breakdown of their meaning:
1. COLORLESS OR SLIGHTLY BLUE SMOKE on start-up means your air/fuel mixture is the right composition and everything is well burnt in your combustion chamber.
2. BLUE SMOKE on startup is usually caused by failed valve seals dripping oil into the combustion chamber when the engine is not running.
3. YELLOW OR BROWNISH SMOKE at start-up means your air/fuel mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
4. WHITE SMOKE on startup may be caused by a blown head gasket allowing coolant to enter the combustion chamber and may start dripping out of the exhaust pipes or mufflers. Smoke while riding is usually caused by worn out or damaged valves, seals, guides, pistons, rings, or cylinder walls.
5. BLACK SMOKE on startup is usually caused by too much fuel in the combustion chamber this can be due to air/fuel mixture adjustment too rich, accelerator pump improperly adjusted, faulty choke or not in the off position, air filter dirty and clogged, faulty carburetor float needle and seat, pilot jet too large, fuel injectors leaking, smoke while riding is usually caused by the main jet being too large or a damaged carburetor.
It should be noted that aggressive or abnormal throttle operation will cause these conditions to manifest themselves exponentially.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the links below. Good luck and have a nice day.
KX250F Smoking out of exhaust What needs replacement
Carburator Theory and Tuning
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf
OEM Parts for Kawasaki 2005 Kawasaki KX125 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 03, 2011 | 2005 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

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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