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Message: [QUOTE="nickyd, post: 917213, member: 56089"] Pat - some blow by is normal - I had a piston in my KDX that had major signs of blow-by. I thought for sure it was time to change it - My compression was still good (around 165psi) but I took her apart anyway - mic'd the piston and she was well within the limits......cleaned the P-valve and put some fresh gaskets and rings in and kept on riding. For what it takes to do a top end on a two stroke, I didn't mind the time (and the few parts - circlips, gaskets, etc) - plus now I have peace of mind that the piston in within the proper measurements and the cylinder is clean. For yours I might tend to ride it through the summer and keep an eye on that compression and maybe do the top end in a few months (dependant upon your riding) - or if it keeps you awake at night, take her apart and mic the parts just to be sure. [/QUOTE]