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Message: [QUOTE="Steve K, post: 242026, member: 27808"] [b]SR to R Power[/b] Hi Iain, Maybe I am paranoid, but after 10 years building 250 National kart engines where we service life a piston to 6hrs max I really feel you would benefit from a new one. I run my KDX pistons for a season (about 40hrs) and if my useage was harder I'd do it more often. I ride mainly in the Peak District and Wales - the thought of pushing the thing miles isn't my idea of fun! Plus I reckon that if the piston let go a new barrel/replate/rod kit looks dear. I assume you have changed the rings, at least? If not I'm sure you would notice it pulling harder. All the best, Steve [/QUOTE]