Youll have tonput some money into it to get it fast but is possible. I got my 250x for 600 but it had bigger a arms extended swinger wide axle works shocks exhaust pumper carb etc....already on it. I spent another 600 rebuilding the engine with a 12:1 piston, web cam, crank and gaskets and stuff and it kills my blaster.
Even though a valve stem broke yesterday on me....lol I should have replaced the 20 year old valves when I rebuilt the engine.
I'd pass on those 2 quads and wait till something modded comes around.