I haven't had any problems with mine, other than what was my fault. I jumped timing due to oil viscosity, and bent the valves. that is fixed now, with new fr500 heads, and high lift cam kit. Mine is for sale by the way, can be seen in the classifieds, and it already has a steeda t/a, and fluidyne radiator, and many other misc. I have heard of the water pump thing, but that is a relatively cheap fix with a particular aftermarket water pump (cant recall the name), and is supposed to give you more top end power for like 300 bucks.