Ultima SHOVELHEAD ENGINES Manual de servicio descargar pdf (Pagina 20)

Intermediate Jetting Procedure:

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

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

 







               



INTERMEDIATE SYSTEM NOTES:

 It is helpful to shut o accelerator pump while ne tuning intermediate circuit as fuel supplied by pump can mask jetting symptoms. Consult "Accelerator

Pump" section of instructions.

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

 Elevation changes: A simple readjustment of idle mixture screw will often compensate for changes in elevation of several thousand feet. S&S test riders

have ridden through changes upwards of 7000 feet without changing jets. In other cases, and depending upon accuracy of initial jetting, a change in

intermediate and/or main jet may be required.

 Higher elevation makes engine run richer, meaning that smaller jets may be required to correct overly rich condition. Lower elevation, nearer sea level,

makes engine leaner so larger jets may be required. While rich condition can cause fouled spark plugs and poor performance, lean condition can result in

engine damage. If smaller jets are installed for higher elevation, remember to install larger jets for operation at lower elevation.

 Intermediate jet provides majority of fuel under average operating conditions. While it is tempting to change main jet because it is more accessible, in

most cases intermediate jet should be changed to properly address elevation/altitude-related problem.

 



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

(See Picture 43)

High Speed (Main) Jetting Procedure:

 

 

 

 

 

 



 





NOTE: Placing engine under load by accelerating uphill may make result of jet change more pronounced and easier to interpret.

 

 



 

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

Picture 43

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