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Kx450f air fuel screw

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Fellas, just put a new top end in my bike with head reworked valve seals and all clearances are good. Timing is also good. Won't start. I can get it to hit for a slit second if I rotate the air fuel screw. Any suggestions??

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Fuel screw is for fine adjust of idle mixture only.

 

Confirm your choke works properly.

Replace the pilot jet with a new one

Confirm the spring/washer/oring are on the fuel screw and thyat the tip of the screw is undamaged.

 

Was the slide out?

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