The Yamaha RX100 is a 98 cc two- stroke single-cylinder air-cooled . Dimensions, L : 2040 mm. W : 740 mm. H : 1050 . and Performance. The biggest plus point for the RX100 was its performance. It had a 98 cc, 2 stroke engine, being air cooled it produced 11 BHP @ 7500 rpm and 10.39 NM @ 6500 rpm. The power production of the bike was massive and it was tagged as the best performer in the 100 cc segment at its time.