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M5 Thanks much appreciate your response. I am heading over this am to buddy house who is machinist so he has all the right tools to measure bore. I see vertex has 3 pistons a b c in 12.6 13.2 and 13.5 compression. I only ride above 6000 ft really so don’t see how 13.5 could hurt me at all or effect dependability on good pump gas..just not sure on forg vs cast ? Anyway I kinda go along the lines of thinking on these Nic cylinders the Indy dan way. Wait and see how it measures before I do anything with that. You have any experience with Ecu on these 13-15 bikes? Good or bad. Thanks for sharing your big bore experience! Hours on bike are over 100 for sure. Can you share the guy you use to do your plating if you are happy with him?You have a few options. Ideally you will need to measure the cylinder. How many hours on it? If it's still in round then you may be able to get away with a light hone and a stock piston but it will likely end up on the outer limit of the ring gap spec after the hone. There isn't much Nikasil to work with. The guy I use for honing wont even touch my cylinder until he has my new piston in hand which allows me to go stock. He also does Nikasil plating so he re-plates the cylinder then hones it to the spec of the new piston. Its perfect. That's the best method. All of my KTM big bores blew up. Each time the con rod bearings eventually failed. I'm sure everyone will chime in and say it's the best thing since sliced bread, each to their own. I now go the cams and porting route if I even bother at all. As far as I'm concerned stock rocks.
M5