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I have 30 hours on a sleeved 2005 RM 250 (cast iron sleeve, not nickasil). When I had the sleeve bored it was bored to a "standard" sized Wiseco piston. I came to find out when it was time to put in another piston that a Wiseco "standard" piston size is 66.40, but I bought a Pro-X "standard" piston which I discovered is 66.35. Any ideas why Pro X would make their standard size piston smaller? Is it safe to run? The clearances seem ok, but I am always leery of running a piston that is too loose in the cylinder. I did not know if this was related to the Wiseco being forged versus cast. Anyone else run across this? Thanks for the help.
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