cylinder wall material?

anyone know wether the cylinder on a '95 XR600R is cast iron or nickasil (sp?). the piston noise, at least thats what i think it is, is getting quite loud and im wondering if it can be bored to a larger size or will i need a new barrel?

just for some background, i already threw that automatic decompressor as far as i could into the desert behind my house cause it started clunking about 30 miles into the mountains making me think i was going to have to push that beast so i know its not that. and valve adjust is good also.



Its not nikasil.

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