I have a stock 18" bar that I got with it when I first bought the saw. My dealer is a real stick in the mud and all but refused to sell me what he considered "too large" a bar for "too large" a saw for my purposes. He wanted me to buy a smaller saw or stick with the 16" bar that came with the PS-460. I see in Dolmar's literature that they recommend up to a 20" bar, but the extra 2" probably won't make as much difference as I'm looking for. I also saw a bar guide that showed a 24" for it, but everything else says 20". In your experience, how large would you put in front of a stock 45.6 cc PS-460? I've taken about all the wood I can get from a few elm's nearby, but my 18" bar presents a real challenge trying to get through the remaining trunks that are about 3-1/2' across. That'll be more like whittling than cutting, but I really don't want to leave it behind...
I swung by his place yesterday to price out new saws, as I've had no luck finding anything used that's larger that I could trust. When I asked about the 7900, he actually laughed and asked "why in the world do you think you need that kind of saw?" To which I responded, "the same reason people usually buy sports cars, or boats, or jet skis, or snow mobiles. Just because I wan't it whether I buy it here or somewhere else." He said "no problem" and pulled out his catalog. He really is an a$$ and I have no idea why I keep going to him, other than his wife is the polar opposite of him and a real pleasure to deal with.
I certainly don't need a 7900 and am not even sure I want one, but the 6400 sure looks encouraging. His rep is coming in on Monday and he's gonna see if there are any deals coming up he can pass on. I'm still not sure I'm going to plunk down that much green, but I'd sure have fun with it, if I do... Until something else catches my eye... lol