Hey Cliffmac,

Duty Cycle is a more or less the measurement of the mixture control in a KE Jetronic FI system (as it relates to this application anyway). Here's a quick breakdown:

http://www.landiss.com/mixture.htm

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress