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Old 05-09-2010, 10:52 AM   #1
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Default Backfiring

Hello,
I just bought a 2005 kfx400. It is starting to backfire and is hard to start up now. Every time I give it gas it backfires bad and shuts off. When it is running and I give it gas it will start to die then kick back up .What could be the problem ? Any help at all would be appreciated.
Thanks

Last edited by Fedor; 05-09-2010 at 10:57 AM.
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Old 05-09-2010, 07:58 PM   #2
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dont mean to sound like an ass, but don't expect too many replies on this. If you just search this thread you will find about 50 questions similar to yours with plenty of knowledgeable answers.
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06 KFX 400
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06 Kingquad
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There is only 2 guarantees in life, Death and taxes. Take your pick. OH forgot socialism may be a guarantee soon so maybe the government will do your valve job.
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Old 05-10-2010, 01:44 PM   #3
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Ive read a couple things that maybe wrong.I first checked the carburetor and It was fine. The other things it could be is the spark plug ,timing chain or the valves. The valves make me a little nervous but apparently what Ive read its an easy fix. I'm just trying to get other input before I doing something else.
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Old 07-14-2010, 05:14 PM   #4
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Quote: Originally Posted by Fedor View Post
Ive read a couple things that maybe wrong.I first checked the carburetor and It was fine. The other things it could be is the spark plug ,timing chain or the valves. The valves make me a little nervous but apparently what Ive read its an easy fix. I'm just trying to get other input before I doing something else.
I had the same problem with my 2003 KFX 400, I did all the same things as you checking and cleaning the carb, I then took the head cover off of my wheeler... To measure the valves, I figured out that it was the intake valves, They were cupped and That is probably the same problem with yours I had backfiring and a load of other stuff, My advice is to go with the Ferra stainless steel valves (High Performance and stronger) And also take it to the local dealer that will save you a pantload of time and keep you from going insane. GOOD LUCK
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