JD jetting and O ring mod for Yamaha WR450f - Keihin FCR carburetor jetting 

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JD Jetting kit:
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In this video I show how to jet your WR450f carburetor using JD jetting kit. We will also do o-ring mod on accelerator pump to get you better throttle response. Keihin FCR carburetors are very popular on 4 stroke dirt bikes, you can follow same procedure while tuning this carburetor.
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wr450f carburetor tuning
JD jetting kit WR450f