my AV10 motor with std variator clutch (but with clutch starter arms removed) and std pulley and std spring work fine with my 82cc motor no goat. mallossi belt. clutch bite around 5000 rpm.
but when i fit an er3 and doppler clutch pulley er86 (modifield) and original spring i get the goat. so its the er3 variator that needs different spring specification.
i have made my own spring . i have 4 belts all different lengths. with shortest belt that compresses spring. i get zero goat. but no variation even with heaviest weights x 6. but with longer belts i get goat unless i remove all weights. and then the belt slips???
do i need to shape the belt so it fits the pulleys better? or will it wear itself into the correct profile after a while?
can you run the er3 without weights and get zero goat?
spring by alan jackson, on Flickr (edited)