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We compare the four-stroke bicycle motor 142F (142-144F) 49 cc (Motomir) and the two-stroke bicycle motor F-50 (Samger A-50) 48 cc (Ali). We evaluate the quality, pros and cons, and analyze some things. A first-approximation review: what the buyer sees out of the box, and what he will have to deal with. I already have experience with 4T, and I look at 2T with the eyes of a beginner. The first video in a series of stories about comparing 2T-4T bicycle motors!