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my kx125 wont start it just back fires

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  #1  
Old 02-10-2008, 03:02 PM
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Default my kx125 wont start it just back fires

can any one hep me out with this as i aint got a clue

i have repaced the plug it has a strong spark the fule is getting into the carb fine but when i kick it over all i get is back fires ??

 
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Old 02-10-2008, 04:07 PM
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Default RE: my kx125 wont start it just back fires

Hmmmm I don't know Mike, but welcome to the forums, there is a lot of knowledge here collectively, be patient and someone here will know what to look for. Again welcome and stick around and get to know these monkeys, they are a good bunch of guys......and gals
 
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Old 02-10-2008, 04:12 PM
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Default RE: my kx125 wont start it just back fires

Hey Mike I just thought of something, what year is the bike? Was it running great the last time you shut it off? I am now wondering if a piece of carbon got in one of the valve seats and is holding one of them slightly open. That will mess things up, but usually gets kicked out in a hurry. If you can do it safely, you might try pull starting the bike and see if you can clear the throat of that bike. Just a thought. But like I said there will be someone who knows exactly what the dealio is.
 
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Old 02-10-2008, 06:33 PM
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Default RE: my kx125 wont start it just back fires

Being that the kx125 is a two stroke, you have good spark and a new plug....I would verify fuel delivery first, do a plug read to see if it fouled. You may want to go through the carb, ie cleaning and float level adjustment.

Welcome to KF!
 
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Old 02-10-2008, 09:08 PM
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Default RE: my kx125 wont start it just back fires

LOL I just realized that it was a KX and not a KLX, thus there would be no valves. So the DEE DEE DEE award for today goes to me.
 
  #6  
Old 02-10-2008, 09:52 PM
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Default RE: my kx125 wont start it just back fires

hahaha, deej. Its all good
 
  #7  
Old 02-10-2008, 09:59 PM
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Default RE: my kx125 wont start it just back fires

Yeah, Start with the carb and plug. Work your way back to the reed cage and make sure one isn't broken off or a slit in the boot. Then see if the power valves are opening and closing correctly. Hope it helps it's been awhile.
 
  #8  
Old 02-13-2008, 04:06 AM
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Default RE: my kx125 wont start it just back fires

also, check the compression if you can.
 
  #9  
Old 02-14-2008, 11:57 AM
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Default RE: my kx125 wont start it just back fires

thanks for the help i have cleaned out all ov the carb and put it back on the bike and the back fire has gone when kicking the bike over but it still wont start

i am going to put fresh fule in it to day and have another go as it has not been started now for about 2 moths

will let you no how i get on.

as this is my first bike i am still bit basic so will av plenty more questions to come lol

thanks again mike

 
  #10  
Old 11-09-2021, 09:58 PM
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Default

Ever get it fixed I’m having the same issue I shut the bike off carb Fowled the plug haven’t got it to run since
Originally Posted by mike_sti
can any one hep me out with this as i aint got a clue

i have repaced the plug it has a strong spark the fule is getting into the carb fine but when i kick it over all i get is back fires ??
 
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