Fuel Mixture Screw


3 replies to this topic
  • XR 650

Posted May 16, 2006 - 05:14 PM

#1

The more you turn out the mixture screw, does it richen or lean out the fuel? I jetted my 650L & it runs excellent, but the tip of the plug is a light grey.

Thanks

  • Dual_Dog

Posted May 16, 2006 - 08:07 PM

#2

The more you turn out the mixture screw, does it richen or lean out the fuel? I jetted my 650L & it runs excellent, but the tip of the plug is a light grey.

Thanks

The "mixture screw" is really the pilot screw. It fine tunes the pilot circuit fuel mixture at idle to about 1/8 throttle. Backing it out counter clockwise richens it up. Turning it in clockwise leans it out.

Lighter plug colors could mean the either the pilot circuit or the main fuel mixtures are lean. Darker colors mean the mixtures could be a bit rich. Tan or Brown is understood to be the ideal color when doing plug chops & color checks.

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  • XR 650

Posted May 17, 2006 - 03:04 AM

#3

Thanks

  • scapegoat

Posted May 17, 2006 - 11:42 AM

#4

Generally speaking if the screw is between the head and carb its for fuel. Out is richer. between the carb and airbox its air, so out is leaner.





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