Alot of times just adding a single means little for rpm's I actually had to take a gram off each of my weights to get it where it belonged, wasn't their to begin with so I waited till I put the CPI and CPC can on to see where it was, it was runnin bout 7600-7700 so I shaved a gram off the heel and it runs bout 7800 so better see where he is really at before ya start buying weights cus you may not need to !!!!! ANd remember cat tachs can be off by as much as 200 rpm's so shoot for 78-79 on the tach should get you 76-78!!!! As far as the polaris weights if yours is a fixed pin like my 05 I don't think they will work but not a 100% sure on that!?!?:beer;