Here is a Konig 125 that I raced for several years. We bought this engine and boat from Jane and Ralph Smith. The powerhead was pretty much "stock" from the factory. The only modification that I remember was water injection into the pipe. We ran this on 12:15 lower unit. I wish we had had an 11:15 back then. But I am not sure that the engine could have taken too much more vibration.
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