search "gy6" on e-bay, web browser etc. you'll get plenty of hits lol. zircon and carbide are gy6s, marauder and black widow use "industrial" type engines. these are horizontal shaft lawnmower type engines that use either a centrifugal clutch or a driver clutch with a separate jackshafted pulley to give a variable drive. GY6s are "lay-down" cylinder configuration with a CV transmission incorporated into them.
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