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From the maker's shared Junior 80/85/100 page: the 100 is 52 x 47 mm (99.8 cc), 6 speeds, Keihin 28 carburettor, 6 L. moto.it's 2023-2026 MX 100 pages list 80 cc and 46.5 x 47 mm (the MX 80's figures), so their engine data is not used. Sold as Junior Fork Mupo (2023-24) and Fork Tech (2023-26) trims. No US MSRP found.