99 foreman 450 es

Hi Folks, here’s the story:

This 99 has always had the backfire going downhill. I only take in to the mountains once/twice a year so it really hasn’t bothered me until now.
This year, while I’m sitting in a tree stand, I read a little bit about it and once I get home I decided I’m going to figure this out.

Now the bike did get rained on.

I start her up, drive her off the truck and put her in the garage. No issues.

I pull the seat and right side cover off and go to start her, NADA.

At this point I’m thinking

rain got into something

the 10 month old battery died

dead short

So where do I start?