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Hey guys i have a 2004 trx 400ex runs alsome. I want to give it more power and torch and top end. What can i do to make this happen. I love this quad but want more. I put a big gun es exhault on it. What else can i do
 

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A mild port Job along with a cam, header, carb mod and big bore kit will be good. You must be careful with the RFVC Motors because they like to hold a lot of heat in the heads and can cook the valve train. Run a good Petroleum/Synthetic blend oil and a large oil cooler if you can and change your oil more often then normal. Did you re-jet the carb after installing the exhaust??
 
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