7/8" is more like what will make your belt last. 1 and 1/8 is to loose IMHO. If I stick to around 7/8 I feel it performs the best and lasts the longest.
I went ahead and got the tools so I can maintain my machine myself. It costs in gas and time way more than it is worth to take it to the dealer every time I need my belt adjusted. I can tear down the machine, adjust or replace the belt and put it all back together in less than 2 hours and I don't rush. It is roughly a 45 minute drive each way to my dealer and it costs 85 an hour there. I am staying way ahead of the game just doing it myself.
2011 Teryx Sport
2011 50" STD RZR LE