The SST received an original flawless seat again. The SST seat has a slightly different pattern and also metal bars on the side compared to a SS-175 or SS-250 seat.
I replaced the airfilter (oval type) with a new UFI part. I also replaced the faulty LUCAS flasher relay with a modern electronic flasher relay as the turnsignals did burn constantly instant of flashing.
New seals for the carb today.