According to service manual, the 1st idle shall be release around 60 deg Celsus the rpm would drop from 1.5~1.8k to the spec 1.1~1.3k rpm. That is around 2 visible threads of the adjustment bolt sticking out beneath the platform. If you do not adjust the dimension "a" of the valve to the right height, the idle would not be release after 80 deg or so temperature and that is waste of gas and time for the warm-up.
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