i am looking to buy a used sled. 2008 ski doo summit x xp 800r. owner has put a rebuilt short block engine in. is a rebuilt short block cheaper to put in then a rebuilt factory engine? what are the advantages/disadvantages of the short block? performance? reliability? for that year of sled, i heard they have a faulty crank, will a short block solve that problem? sounds to me like the guy blew up his sled and took the cheap alternative to fix it up then sell it. is it worth buying with this rebuilt shortblock engine?