2004 kawasaki KX 250 F Logo
Posted on Jul 10, 2009
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No idle &bacfires on deceleration

2004 kxf 250 kawasaki dirt bike,wont idle &backfires.pops on deceleration.

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  • Master 1,167 Answers
  • Posted on Aug 20, 2009
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Joined: Apr 03, 2009
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Hi mate on the carb you will find 2 screw 1 is for the idle and the over is for mixture the idle one will be the furthest out screw it in 1/4of a turns will the engine is running this will take the idle up on the engine and the backfiring is fuel in the exhaust not being burnt so on the over screw on the carb screw that in 1/4 of turns this will decrease the amount of fuel going into the engine if it still backfires screw it in 1/4 of turns again and see what difference it makes good luck

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Hi there i have a kxf 250 2004 its hard to start and when it does it back fires alot could it be valves

It could be valves , check all the valve clearances.
also try a new spark plug
and clean the carb
a faulty kill switch can sometimes cause backfire as well
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the fact that it idles with the choke on indicates that fuel mixture is the problem here remove the mixture screw completely check that the o ring seal is not damaged & that the end of the needle is not worn or bent if either of these conditions are obviouse replace the damaged or worn parts general rule of thumb with mixture adjustment is 1&1/2 to 2 turns out give it a try
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Just bought a 04 kx250f starts very hard and pops and backfires

Sorry, could be a clogged up carb from sitting or a bad ignition box. Have you got a pal with the same bike you could change out the carb to try? If the bike sat for quite a while, it almost certainly needs a carb cleaning and service.
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My 2007 KXF 250 keeps backfiring? why is this?

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I have same bike and know some about it. and i race a lot. your bike has a crank or rod whatever you want to call it but it could be cracked, broke, or even could have dirt on it.
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