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Pure sound of Moki 257 on low idle - 250cc petrol 4T 7 cylinder
This is after 4 liters on 1:30, now 1:50 with Valvoline Synpower 2T oil (full synthetic) and with really big 34x14" scale prop. Absolutely no problem for this big radial engine. Spin up is very fast and idle is around 700 rpm. Lowest idle is around 500 rpm, stable.
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