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tecate1987

carb question

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how can I determine if a carb is from a 300ex or a 400ex?
I just got a 2001 400ex and the main jet is only 127. stock 300ex is 122 so I was wondering if its only a 300ex carb.
 
 
Edited by tecate1987

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38 minutes ago, tecate1987 said:
how can I determine if a carb is from a 300ex or a 400ex?
I just got a 400ex and the main jet is only 127. stock 300ex is 122 so I was wondering if its only a 300ex carb.
 
 

side of carb has a number stamped on it, go to partzilla, find your make/model/yr, look below the carb name, it should have the carb part number showing you the correct carb for your atv. next time, please include the year of your atv, this makes it easier for us to help you ! :-).

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As per the service manual (they are free here on the forum)

The 2001 400EX  carburetor casting ID should be QB10A with a 148 main jet

The 2001 300EX carburetor casting ID should be  QB02B with a 122 standard main jet or a 122 high altitude main jet

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ok  thx  mine shows QB 10A   again however my main is 126 or 127 dont remember at this point.  Im gonna get a larger jet for it.

 thx

 

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Post a picture. I will tell you which one its from. Welcome to the forums!

 

Sounds to me like it has a dyno jet kit. Those jets go on a totally different scale.

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That is without a doubt a 400ex carb. The dyno jets go on a different scale completely. So yes number would be way crazy. They are also round with a flat head slot in them. Where the oem jets are hex jets.

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