1st of all...
Are you in for a treat
The first ride,
You won't be 1/2 a mile and
you'll be talking (possibly hooting) to yourself !
Been there in '04, had a blast
Anyway, check the manual and adjust things accordingly
Don't be suprised at the softness of the suspension
It's done that way to absorbe the bumps, not bounce off of them.
Sleds are set up stock give or take, on the light side, meaning a cumfy ride for 180lbs.
Aggresive riding needs tightening up a tad
At 290 your going to want the springs cranked in even more
When you start riding, if you bottom out hard and you run out of spring
You might require different springs or shock work if you want the best ride possible.
Hopefully, someone on here see's this with your situation that can be more specific.