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I have 2007 TRX 450 ER. It will start and idle just fine as soon as you put it in gear and try and give it gas it sputters and dies. I had the engine rebuilt last year and the valves were adjusted.

Does anyone have any thoughts as to why it dies when you give it gas?
 

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To me it sounds like it could be either a Stuck Accelerator Pump Diaphragm (Most Likely) or a clogged Accelerator Pump Nozzle. Maybe even a blown out Diaphragm... I've even seen where when a quad sits for a while with gasoline in it and water gets into the fuel and then when it gets into the Accelerator pump it blows out the diaphragm.
 
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