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go off the specs in the service manual to start with

 

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You would definitely want to look through the manual but here's a good video to give you some idea on the process of air/fuel mixture. 

 

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Screw the needle all the way in, then back it out 2 1/2 turns out. This should give you a starting point. Start the engine and slowly adjust until runs decent.  If it won't start, back out 1/4 to 1/2 turn at a time. 

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