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Author Topic: 640 DUKE , RICH AT IDLE  (Read 221 times)

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Offline NEON DEON

640 DUKE , RICH AT IDLE
« on: January 29, 2018, 10:03:57 am »
I have a duke that starts fine , idles nicely , but splutters when its hot . plug is black , tells me its way to rich . turned the mixture screw out 5 1/2 turns , dropped the needle , no joy . what is the correct idle jet size?
 

Offline Bill the Bong

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Re: 640 DUKE , RICH AT IDLE
« Reply #1 on: February 06, 2018, 11:05:27 am »
Turn the fuel screw in to go leaner, not out.