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Forgot about the tire question. Article I read many years ago discussing all terrain tires stated offroad miles wore tires out way faster than pavement. The reason being was that sand/dirt is very rough. Can't remember all the details but a grain of sand/dirt has many different sharp edges. My UXV 700i has maybe 3/4 of the tread left with just over 1k miles. Mine mostly runs in grass, yard, road right away (grass), 15% dirt and maybe 10-15% pavement. If it continues, I might get 2.5k or more out of my factory tires.

Different tires have different hardness of the rubber,  soft rubber will wear faster and most original tires are soft.  One reason I went with the SunF tires is they are a harder rubber and reports are they wear better, especially on pavement.  RandyO has had great luck with road tires on all surfaces....they are of a much harder rubber than off road tires.  You dint need sift rubber to get good traction like mfgrs want you to believe.....they just want to sell you more tires!!!  Lol

When an accident happens and the poor kid gets injured, Dad will want to blame and sue the scooter mfgr !!!!   Dad is an idiot, unfortunately he probably votes as well !!!

I also have a 2015 model 450i and it gas been a great machine!! As far as a fuel filter....I dont know but will look it up in my service manual.  If there isn't one, time to put an inline filter in the fuel line.  Old fuel can cause issues, drain or siphon as much as possible and add fresh.  My rubber cap on the coolant bottle is also dry and cracked, coated it with silicone grease to keep it from getting worse.  Looking for an expansion plug to replace it with.  My stick tires were replaced around 1800 miles, worn but not bald, saved them onto spare rims to use when pavement riding.  I live in the coyntry and we can ride on the back roads..   I replaced mine with SunF AO33 bias ply tires.  Have a few hundred miles on them, no complaints.  Work well in snow, quite and smooth on pavement.  Havent been in deep mud but confident due to snow performance. The nice partbisvthey are not that expensive, and have really stiff side walls.  In fact you can run them with O air pressure at slow speed if you get a nasty blowout you cant fix on the trail !!!  They are also a true 25" tire, mabey even plus a little. I always use fuel conditioner in my SxS and my boat, never had an issue with either !! Will be getting my soft side enclosure and plow mount on so it is ready for winter snow plowing, cant wait, fun times plowing snow!!

As long asvthe hole pattern and offset is the same you will be fine. Try and match the rim width if you can but not a critical dimension.
I picked up a set of Yamaha rims as spares to mount my old tires on, when I bought new ones.

Unfortunately most have mental issues, it has been proven many times over that when they are taken off the street and given the necessities to take care of them selves, most return to the street. In my younger days there were numerous organizations trying to get the himeless off the streets but in most cases proved to be futile.

Do you have a front mount for your plow or a mid mount ?  Just curious as I have heard complaints about frame damage from front mounts.  When I made my mid mount, I tied three crossmembers together as support for the mount.  Knock in wood...so far so good!!

Not sure about the 500 as I have a 450, but....if it were mine, I would pull the starter and test it.  While it is out, you can clean and relube the clutch.  Clean the electrical connections etc !!  New starters are not Cheap, hopefully you can get it sorted out....