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Discussion Starter · #1 ·
Hey guys, new member here on the forum but I've been viewing for a little while now. I'm the proud owner of a 2000 400ex that I bought about 3 weeks ago, and so far I have been very impressed and loved every minute of owning this thing! However just recently, It has developed an issue that I need to get figured out.

Specs:

2000 400 EX
K & N Filter
Wiseco 11:1 Piston
Stage II Hot Cam
White Brothers E-Series Slip on

The story goes: A buddy of mine and I were on a laid back cruise down some gravel roads, mostly just third gear light throttle cruising with the occasional wide open blasts. Quad ran just fine as it has since I bought it. After our ride I loaded it up in my truck and made the 15 minute drive across town. When I got home I took it out of the truck and went to put it in the garage. It started just fine, however whenever I cracked the throttle it would bog out and die. No problem starting back up, but same problem. On half or full choke, it's better but will still bog out and die. I also messed with the idle screw to speed up the idle, and when doing so it will eventually bog the motor out and die also. This leads me to believe that when receiving more air (idle screw/throttle opening) that its starving for fuel and dying.

So, gut instinct tells me that maybe the carb just needs cleaned? Or maybe its something more? If it is the carb, what parts must be removed from the carb for a proper cleaning?

Just curious what your guys' thoughts and opinions are.

Thanks in advance!
 

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Welcome to the forums... I would start by giving the air filter a good cleaning, especially if you are running an open air box. then I would give the carb a good cleaning also. And dump in a can of seafoam in the tank for added measures.
 

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Discussion Starter · #3 ·
I'll clean the air filter and go from there. Are there any good write ups on how to clean a carb? I understand the theory...but am more familiar with automotive carbs.
 

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I'll clean the air filter and go from there. Are there any good write ups on how to clean a carb? I understand the theory...but am more familiar with automotive carbs.
welcome to the forums, first..purchase a can of gum out carb spray cleaner...remove your carb off the bike..remove the o-ring from the carb to intake , ( the carb cleaner will dissolve this o-ring ! )..take the carb apart..remove all the jets ( brass looking )..with one wire from a wire brush ( nothing bigger !! )..poke it through the high and low jets..blow some comressed air through them..set them aside..spray the rest of the carb down real good with the cleaner..blow the carb out in every hole..nook..cranny..assemble the carb ..install..fire it up..see how it does. p.s. you can also purchase a carb rebuild kit .
 

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Discussion Starter · #5 ·
I'll clean the air filter and go from there. Are there any good write ups on how to clean a carb? I understand the theory...but am more familiar with automotive carbs.
welcome to the forums, first..purchase a can of gum out carb spray cleaner...remove your carb off the bike..remove the o-ring from the carb to intake , ( the carb cleaner will dissolve this o-ring ! )..take the carb apart..remove all the jets ( brass looking )..with one wire from a wire brush ( nothing bigger !! )..poke it through the high and low jets..blow some comressed air through them..set them aside..spray the rest of the carb down real good with the cleaner..blow the carb out in every hole..nook..cranny..assemble the carb ..install..fire it up..see how it does. p.s. you can also purchase a carb rebuild kit .
excellent. I'll just use my best judgement while cleaning it.
 

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I'll clean the air filter and go from there. Are there any good write ups on how to clean a carb? I understand the theory...but am more familiar with automotive carbs.
welcome to the forums, first..purchase a can of gum out carb spray cleaner...remove your carb off the bike..remove the o-ring from the carb to intake , ( the carb cleaner will dissolve this o-ring ! )..take the carb apart..remove all the jets ( brass looking )..with one wire from a wire brush ( nothing bigger !! )..poke it through the high and low jets..blow some comressed air through them..set them aside..spray the rest of the carb down real good with the cleaner..blow the carb out in every hole..nook..cranny..assemble the carb ..install..fire it up..see how it does. p.s. you can also purchase a carb rebuild kit .
excellent. I'll just use my best judgement while cleaning it.
just make sure you do not poke anything bigger than one wire through the jets..or you will distort the jet size..and it will never run right..oh..try not to bother with the pilot jet ( this is the air/fuel mixture screw on the bottom ) unless you are doing a carb over haul with a rebuild kit.
 
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