so i saw this 250r for sale at 4500$ with a esr 310 kit, i wanted to know how long these things will last and if the kit is good for my riding style. i ride glamis mostly and sometimes go to superstition. in glamis, our group almost flies through the dunes and i wanted to know if the 310 kit is suited for that and if it is comparable to 450s. i need a bulletproof quad as i dont have 10k dollars sitting beside me that i can dump into an r. i also need to know what kind of maintenance this thing requires, does it need more than just the right fuel mixture, oil change, spark plugs? thanks to anyone who helps because a 250r is my dream quad.