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In this video we will first try crankcase stuffing for the last time and also test if power loss was due to a beginner mistake. Then we will install the new Mannerheim. Will even that give more power? 00:00 Testing 1.35 crankcase compression ratio 12:43 Testing if a textbook example portmatching has effect 19:50 Final result for crankcase stuffing 25:46 Installing new cylinder and measurements 40:25 Starting Mannerheim and test 57:50 Results after adjustments