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Video about replacing the crankshaft in a 139 scooter engine. Complete assembly and start-up. #crankshaftreplacement#139qmb# Instagram- teoriiaskutera VK group--https://m.vk.com/club137935162 Playlist navigation: Charging problems- • How to check the relay regulator (relay z... Generator check- • How to check the high-voltage coil ... Carburetor- • How to check the fuel enrichener of the carb... Spark problems- • How to check the high-voltage coil ... Scooter won't start- • Why the scooter starts poorly, problems... Variator- • How the scooter variator works visually