300/440/550 440 low + high carb settings

Does anyone no wat the stock settings are for the low and high mixture screws on a js 440 are?? im pretty sure that it is a 78 model..
also does it matter if there is a little wear on the point of the mixture screw??
ive been searching and all i have found is carbys with the screws on one side of the body.. where as mine has one on the left and one on the right..
thanks for the help.. ash
 
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