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engine_cc computed from the maker's 47.95 x 47 mm (84.9 cc). The maker's Junior page covers the 80/85/100 on one platform with three wheel sets (J14/17, J16/19, J12/12); its 85 is 47.95 x 47 mm. The maker's 2020 page shows a 9.5 L tank and 21/19 tyres, copied from a full-size template; tank not used. moto.it gives 47.5 x 47 mm (83.3 cc), which does not match its stated 85 cc; bore not used. Wheels 17/14 per moto.it. Dirt Bike 2020: new Mupo fork, new port timing.