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I just picked up a project 89' YZ490. The bike runs and starts, but it seemed a little down on compression (for a 490), so I took the top end off expecting to see a worn out piston/cylinder. The guy I bought it off of said it was on the original bore (yeah right!). Measured it, and its at 1.50mm oversize. Bore measures within specs, but the rings were worn. This time, i'm not going to bore it - I'm just going to throw a new set of piston/rings in. But since I've only got one bore left on this cylinder, my question is:
Has anyone here tried to get there steel liner coated with nikasil so it lasts longer? Pluses and minuses of it?