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crf 450r wont start

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so i got a crf 450r runs butiful but tonight it was chilly and i tried to start it and it just wouldnt fire up. please help

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+1 , on above , also , if you try that and it does not help , at the bottom of the bowl on the carb you will see a slotted screw , its the FUEL screw , you might have to twist the carb to get at it (loosen the clamps on the intake side and Airbox side of the carb, then twist the carb so the bottom of the bowl is closer to you) , turn the fuel screw counterclockwise 1/4 turn and try to start it again (return carb to original position , and re-tighten claps), if close it will try to start , but if not easily started go another 1/4 turn , usually when the temps drop you need to richen the bike , dont forget to re-tighten the clamps when you twist the carb back where it belongs

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