It's all simple with a manual....
Problem is, if the motor burns oil it msy hsve never been cared for before you. Once oil levels go low, the cam journals starve for oil, the rocker arms and shafts starve too.
It can cost a fortune to fix, but used parts are out there! and the 200SX quad has your same top end.....
Get a manual, read up on it, tear it down and see whats junk..... They build it up to snuff and have a ball!!
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country