What was the difference between the 02 and 03 zr 440 sno pro pistons? The 02 pistons were discontinued, so what is the advantage of the 03 pistons? Any power gains? How long do the 02 motors go before a rebuild? I was going to rering my 02 Sno pro that has 7 races on it (guy who had it before me told me that) and now I've put on 300 miles. Should I rering the original pistons or put the new 03 pistons in it? One more question, what position should I have my limiter straps on to keep the skis on the ground? Thanks in advance.