Thread: Rigid_EVO Idle speed screw thread size
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Old 3rd August 2021
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If you are talking about the idle screw (not idle mixture) I haven't found it yet.
I measured mine at .154" with a 36 TPI (36 matches to a #8 screw)
But the standard OD on a #8 is .164".
I don't have a metric scale but converting I get 3.9116mm.
So I don't have an answer, just relaying what I measured.
But the carb was made in Japan, most likely metric.
I'd try a M4 x 0.7 (standard OD is .157")
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