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Since you cannot test the octane rating of your mixed fuel don't use it. Use a fuel from ERC called 110k with high convective cooling and 105 motor octane. This fuel will help cool the combustion chamber something any aircooled engine needs. The black on the back of the bearings can indicate a general bearing overload. You may have some detonation, I may not have been correct in talking about inertia because the spalling is on the rod half of the bearing not the cap half where the larger inertia loads are concentrated. I would think you have 160+ hp at the crank 200 with a 912 even with major port-combustion chamber work and giant carbs may be a pipe dream.
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