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My 04 trx 450r will start and run great for a about 45 seconds then it starts to bog down and die. Please help
 

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I have the same problem on my 04 450 and I noticed gas’s pouring out the overflow on the carb Even though the seat and neatle looks good. I was wondering if yours is doing this too. ( mine has a cheap carburetor on it so there may be more problems with the carb than in the float bowl.)
 

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Could be something else, but sounds like the ole clogged tank vent issue to me.
 

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Making HP ain’t free. . .
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Make sure the vent is flowing freely. If it’s clogged, unclog it, if the hose is crimped somewhere, uncrimp it, if It’s faulty, replace it.

Easiest way to check if it’s the vent is to run it with the fuel cap loose and see if it continues to do what you described.
 
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