How can you tell it's running lean? Backfires, blue header, white or light gray plug, burnt valves, etc. :'(
Yes you can rejet it, it might not be the best, but it can be better. Read Savage Wahines carb clean, good pict's step by step, also savage gregs carb setup, good picts and labels.
Lots of good tips from everyone, for a perfect tune, watch your plug. Get a full set of jets from lancer. Get a few brand new plugs, wash the bike remove all dirt from around the tail pipe and clean the exit of the tail pipe. You'll need it clean so as not to confuse old stuff with new.
Are you starting from stock? 145 main 50 pilot? note what ever you got, you knows, the gas rationing cops may come around and force you to make everything stock.
I changed mine to a 150 and noticed immediate improvement w/o loss of gas mileage. I'm may change to a 152 to see how that goes, but I think the 150 is pretty darn close for me. Stock air filter and supertrapp.
I live a hot climate too, but that isn't why you need to rejet. Suzuki had to tune these bikes to meet epa reg's for a wide range of altitudes. So bike at sea level are lean while those in denver are a little rich. For your best performance you need to fine tune that a bit. When's the next time you'll be in denver? never? fine rejet. just keep in mind that once you get out of florida and see something rising up over the horizon with a road going up it, that's a mountain, your bike may not perform well as it goes rich.