Anyone tell me what the tire pressure should be on the downtown 300 i with manufacture tires? Thanks
If you wish to go "by the book" look what the owners manual states, or the sticker on your DownTown.
If you want to go with "my experience" based on many, many miles on many different motorcycles and scooters: As high as yo can "stand" and is permitted by the TIRE manufacturer, printed as "maximum load pressure" on your tire's side-wall. However, if it says e.g. 44psi or even 50psi, my "cut-off" top pressure is 40psi, and I check often so it never falls below 36 psi.
This conclusion for me is based on "safety", "not wanting to bend rims" on potholes, and "tire life".
That works for me very well, doing a lot of curvy roads. If one rides mainly straight and no-pothole roads, a lower air pressure between 34-36psi works well too. However, my experience showed over the years, in general, higher air pressure (for street use, not racing) has technical advantages and is safer.