If you're looking for manga similar to Bakuon!! Amano Onsa no Nikoichi Hanjouki, you might like these titles.
Rena Takizawa knows everything there is to know about Italian Motorcycles—she owns a repair shop and has a good business dealing with exotic bikes. Susumu Miyagi, a 19-year-old, rents the apartment upstairs. It's cheap, but it's noisy as hell living above a motorcycle shop. But Susumu has the hots for the older Rena, and he will do what he can to help Rena, despite the fact that she knows far more about what she's doing than he does...
The tale of two crime-fighting vigilante sword-fighting girls who travel from scene to scene by motorcycle and get themselves is stopping crime, and causing as much damage as possible along the way. Oh, the tall one is a bit of a pervert, and the short one is a maniac, but they are really trying to do good…