It's simple. You got 5K to spend, this is how you do it.
long travel suspension (fireball, LSR, American Star) with a decent shock ( stadium, Ella, axis, etc)
$3000
Then take your stock engine send it to a sponsor and get a dune/mx ported 4 mil with supporting mods
1500-2000
Then exhaust (used) of your choice.
you would have a fast and nice handling bike.