My bike is smoking and recently jumped timing. I tore it apart. Valves were smashing the piston but they appear to still be seated properly and not bent. Anyway, I’m trying to figure out what to do here. My piston says 408 and measures 85.66mm and the bottom of the cylinder averaged 85.74. I don’t have a bore gauge just yet. Can I just replace the piston and rings here without doing any more boring or using a sleeve? I’m assuming based on the piston size that it was bored 0.75mm. Also what size piston do I need to order. I can’t seem to find a 408 piston. I’m just a little confused here. Any help would be great!