https://www.largescaleforums.com/threads/king-motor-baja-is-garbage.16791/
https://www.largescaleforums.com/threads/king-motor-baja-30-5cc-ksrc-001-rtr.21591/
https://www.largescaleforums.com/threads/diff-question.21755/
All in all, you got some reading to do.
Swap the diff oil for 30K if I recall, the factory one is too light. Get both chassis braces from Turtle Racing, through DDM.
8k spring for the clutch, shim the clutch shoes, make sure there is no binding without the springs installed.
Verify the shock shafts are not getting jammed, usually the pistons are too wide rubbing against the piston walls.
Set your failsafe, usually from factory is not set, and a kill switch
Use synthetic oil, 25:1 with 93 octane fuel or highest you can find. Let the engine cool off between runs.
Locktite the bolts for the ignition coil, check flywheel gap.
Locktite ALL nuts
CNC spur gear backplate
Set your EPA in the Tx below 100, or check thats its lower than that so the servos don't over-work.
Its got its minor issues which need to be addressed, but for the price is a great rc. Do follow others advice, the throttle servo will fail sooner than later, get a Killer Bee KS. I learned it the hard way on the X2, cost me 200 dollars, bent chassis, and complete new front suspension.
Welcome aboard!