My '80 basket case was missing the mud flap when I bought it but as soon as I get that far with putting my bike together I will make a new one.Like it has already been mentioned without one things will get messy under the seat and maybe even the back of your leg.
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the guy who I bought my bike from removed it and boy was it a mess under there. I removed the seat to change it, and the elctronics had mud caked to them. I cleaned it off good and made myself a new mudflap so it doesn't happen again. I say keep it.