Hi guys, Reviewing recently purchased 640 '01 I discovered this The bike has 5000 miles on the counter but lots of owners. I suspect it was ridden in off-road a lot. I replaced the impeller and checked all the hoses and drained water and I found all the impeller bits. Question: Should I be worried about plastic impeller being shattered? Can this signal a major problem I'm not aware of or this "just happens" ?