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cant find fuel mixture crew

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I am new at this and I want to get a fuel screw to adjust my fuel mixture, everything I read in my manual says things about pilet screw main jet ect.

I have a 2008 crf 450r

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Fuel screw in on the bottom of the carb,just in front towards the engine of the large 17mm cap (which covers the main jet and pilot jet). There is a small hole, up there is the screw. Due to the difficulty of getting to it, everyone swaps in an extended screw. Do yourself a favor, buy a Merge Racing extended fuel screw. If not that brand, do not buy an alloy one. Only get a brass or stainless steel one.

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Fuel screw in on the bottom of the carb,just in front towards the engine of the large 17mm cap (which covers the main jet and pilot jet). There is a small hole, up there is the screw. Due to the difficulty of getting to it, everyone swaps in an extended screw. Do yourself a favor, buy a Merge Racing extended fuel screw. If not that brand, do not buy an alloy one. Only get a brass or stainless steel one.

Just curious, why not an alloy one? I have a brass one, pretty much by default, not by intelligence. Wondering what's the difference.

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