FREE Yamaha Tri Moto

[this old rz]

Heya everyone, I could use some help here.
What I have is a Yamaha Tri Moto, shaft drive. Don't know the size think it's a 225? A friend picked it up for me from a farm, where it sat in a field for 22 years.
Lady said it was her ex husband's...lol
Was occupied my mice sirgil,snorkel and huge massive wasp nests.
1.)
I took carb off , cleaned it.
2.) New plug
3.) New battery
4.) Changed fluids
5. ) Rotated motor after soaking w marvel mystery oil .

Anyways..When I turn key on...nuthin..no lights , no starter.
I looked at wires..dint see any mouse damage?
What can I do to test start this thing

I called two ATV shops and they both said trash the bike, it will never stop..the electronics are likely ruined and there's no way to get a replacement?
This thing is cool as Fck..
Big Ol Fat tires, Huge racks, trailer hitch..I'd love to get it running ..

WHAT DO THE EXPERTS HERE SAY, AND ADVICE.. ANY IDEAS. Tell me what to do & I'll try it

Thanks in advance

[this old rz]

I'm having a hell of a time w this site? Can't upload images, can't edit my post and I'm getting random pop ups all over my screen when logged in??
Still .without viewing pics any help or steps are appreciated.
If I don't get it running..it's gotta go to the dump..I can't have this thing taking up space anymore .it's been here 2 yrs ..lol