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v6 engine and 4 speed clutch with neutral
make 6 pistons and 6 cilinders
K'nex gearbox: Make your K'nex motor 6x faster!by H1T4TCH1
K'nex Gearboxby gingernutsjonny
knex four speed gearbox with clutchby danprima
K'nex Auto-Clickerby H1T4TCH1
K'nex Gearboxby dickheijboer
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