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Backfireing 400ex

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Old Nov 5, 2012 | 06:56 PM
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Default Backfireing 400ex
My 400ex backfires alot and it has gas in the tank. i have not put a carb. kit in the carb. could that be the problem?
 
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Old Nov 5, 2012 | 07:06 PM
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When does it backfire, letting off the gas, or just sitting there running? You seem to have some issues with your carb.
 
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Old Nov 5, 2012 | 07:21 PM
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When i let off the gas
 
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Old Nov 5, 2012 | 07:48 PM
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You are running lean. What do you have for mods? Did you ever get it to stop reving?
 
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Old Nov 5, 2012 | 08:01 PM
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I have no mods to carb. No it still revs
 
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Old Nov 5, 2012 | 08:09 PM
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Does the motor, filter, exhaust have any mods? With the reving did you check the intake boot to see if the carb was seated in the boot properly?
 
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Old Nov 5, 2012 | 08:20 PM
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k&n filter hmf slip on. Yes i made sure it was in the boot.
 
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Old Nov 5, 2012 | 08:34 PM
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Jetting should be around 155-160. If the carb is clean I'm not sure I can help on the reving.
 
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Old Nov 7, 2012 | 07:11 PM
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Originally Posted by jgar
Jetting should be around 155-160. If the carb is clean I'm not sure I can help on the reving.
I havent put a carb kit in it yet if that is what you mean. I ordered one but didnt get it yet.
 
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Old Nov 7, 2012 | 10:07 PM
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Yes, thats what i mean. What brand of carb kit?
 
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