So, how old are the tires on the bike? Our lives depend on two contact patches less than the size of a bar of soap! Tires are the LAST place to scrimp and our second (after sight) line of defense. 25F/29R is common pressures for a lot of scooters but you should always consult the tire first or the manual or the dealer for correct pressures. Just put the BEST tires on F/R you can afford and ride on! Depending on the size of the tires I think most Honda dealers will mount tires for free if you buy them there (figure out the cost difference, it's usually not much more to go that route). I don't think you have to stick with "OEM" brands, either. My2c Ride Safe!