77 exciter clutch question

338gpx

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Joined
Feb 18, 2007
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i have a 77 exciter clutch on my 338 gpx i have a white/brown spring with yamaha f1 weights i would like to have an ingagement of 5000 and a shift of 8700-8900 how could i do this or should i use a different spring?
thanks
 



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