Ultima SHOVELHEAD ENGINES Manual de servicio descargar pdf (Pagina 18)

 









 



 



 



 





2- Adjusting Carburetor

 

See Picture 39, below left.See Picture 40,

below right.  

 

 

 

  



NOTE: Turning screw out (counterclockwise) makes idle mixture richer. Turning screw in (clockwise) makes mixture leaner. Normally, correctly adjusted

screw will be between 1¼ and ¾ turns out from bottom if intermediate jet size is correct. Note that mixture screw must be adjusted according to Step 3

above. Do not leave screw at initial 1½ turn setting without ne tuning.

    



 

IDLE CIRCUIT NOTES:

 If idle adjustments are made before engine is fully warmed, idle mixture will be rich when engine reaches operating temperature. This is especially true

for engines with aluminum cylinders such as Harley-Davidson® Evolution® and Twin Cam 88®. If ambient temperature is below 60 degrees, engine may

require 10-15 minutes of normal riding to reach operating temperature.

 Whenever intermediate jet change is made, idle mixture screw must be readjusted.

 If the idle mixture screw is more than 1¾ turns out after idle mixture is correctly adjusted, it is a fairly good indication that the intermediate jet may be

too small and should be changed to the next larger size. If the idle mixture screw ends up less than 1¼ turn out, the intermediate jet may need to be

changed to the next smaller size. Be aware that idle mixture screw adjustment can be eected by other factors, but can quite often indicate rich or lean

intermediate jetting.

 If idle mixture screw is turned completely in, engine should not run at idle. If engine continues to run at idle with idle mixture screw seated, recheck initial

setting of idle speed screw, and make sure enrichment plunger is seated.

Picture 39

Picture 40

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Ultima SHOVELHEAD ENGINES Manual de servicio Pagina 18

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