For the amount of work involved, I always do a complete top end. I do this every winter, and I'm good for the next season on my 250 with good oil (Amsoil) and always a clean filter. I run a "B" size Vertex in my "A" cylinder, and it works fine. Holds performance all year and looks decent when it comes out. Vertex are relatively inexpensive. Remember there is more to time on a top end than wear, the piston fatigues as well.
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