I'll be re gearing mine in the next few days and I can let you know. I am guessing the OEM chain will work with 15/48. But it will be close. I have about 1/2 " of forward movement left with adjuster block on the short side. I am also going 48 rear and hope to be able to change between 15, 16 and 17 front. But I will replace chain. BTW, I couldn't find a 14 from KTM. Maybe available aftermarket. CS sprocket is different from smaller singles and 950/990s.