Hey all,
After much help with my timing issue my 2004 400EX is running awesome again. Except it is burning a little bit of oil when I rev the bike up. Compression was at 100lbs cold and after adding oil through the plug hole it went up so I suspect rings to be the issue here.

So, the new plan is to do a top end rebuild on it. My question is should I order a standard size and just rehone the cylinder? I have one of those ball hones that I can use to rehone it, assuming there isn’t any damage to the cylinder walls. Or will I need to order an oversized piston kit and get the cylinder bored?

Thanks