Question about 2003 Suzuki RM 250

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My kx 250 backfires

Is it true that the kx 250 will bacfire if the exhaust is leakine at the manifold?

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  • Suzuki Master
  • 2,050 Answers

Two stroke? never heard one backfire while running. But, a leak doesn't make it run better.

Posted on Jul 30, 2009

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Posted on Jan 02, 2017

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No start on bear tracker 250 just backfires


then the timing is not set properly .

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2004 Suzuki VL1500 Intruder LC Motorcycle backfire


If they cant duplicate it your good.Usualy with backfiring i would make sure to eliminate any exhaust leaks. The dealer is inexperienced at solving compound problems,(sorry) not picking a fight, but sometimes cleaning is not goog enough,I went through this with a 1400 Intruder.several attempts were needed to get the two carbs level on the same line with each other.so the floats would work properly together,then set fuel flow and the air flow through the ventouri in the carbs.Also i had to make these adjustments while level (not on side stand) The floats were very sencitve to needle valve to seat adjustment(bent to open or close some of the flow)

Apr 12, 2010 | 2002 Suzuki VL 1500 Intruder LC

1 Answer

Is a power valve spacer and i reed block spacer the same thing?


reed valves are in the intake rubber manifold, so the fuel mix can only go one way into the motor, Power valves are on the exhaust side of the motor and vary the exhaust porting to suit engine revs. They are not the same

Jan 16, 2010 | 2003 kawasaki KX 250

1 Answer

No idle &bacfires on deceleration


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

Jul 10, 2009 | 2004 kawasaki KX 250 F

1 Answer

My 2007 KXF 250 keeps backfiring? why is this?


Backfires are caused by mixture burning in the exhaust pipe. I would suggest that you check the seal between the exhaust valves and the head when the piston is on the compression stroke. You may have a burnt valve (I understand KXFs are prone to this problem!). Try talking to Teamgreen Kawasaki, they may be able to point you in the right direction. Good Luck!

May 16, 2009 | 2006 kawasaki KX 250 F

1 Answer

Backfire


the bike will like backfire/misfire and if i hold the throttle steady it will backfire like 2 times again....and it does this while riding at a steady pace too...it just started it didint do it a week ago. i didnt change anything except a new air filter..fuel screw is 2.5 turns out . the timing valve clearances and everything is in spec. is this a sympton of it being rich or lean? and it doesnt do it on chokeYes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...,,,

Nov 10, 2008 | 2001 KTM MXC 250

1 Answer

Backfire


the bike will like backfire/misfire and if i hold the throttle steady it will backfire like 2 times again....and it does this while riding at a steady pace too...it just started it didint do it a week ago. i didnt change anything except a new air filter..fuel screw is 2.5 turns out . the timing valve clearances and everything is in spec. is this a sympton of it being rich or lean? and it doesnt do it on chokeYes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...,,,

Nov 10, 2008 | 2004 KTM EXC 250

1 Answer

Backfire


the bike will like backfire/misfire and if i hold the throttle steady it will backfire like 2 times again....and it does this while riding at a steady pace too...it just started it didint do it a week ago. i didnt change anything except a new air filter..fuel screw is 2.5 turns out . the timing valve clearances and everything is in spec. is this a sympton of it being rich or lean? and it doesnt do it on chokeYes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...,,,

Nov 10, 2008 | 2003 HM Motard 250

1 Answer

Backfire


the bike will like backfire/misfire and if i hold the throttle steady it will backfire like 2 times again....and it does this while riding at a steady pace too...it just started it didint do it a week ago. i didnt change anything except a new air filter..fuel screw is 2.5 turns out . the timing valve clearances and everything is in spec. is this a sympton of it being rich or lean? and it doesnt do it on chokeYes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...,,,

Nov 10, 2008 | 2003 HM CRE 250

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