96 cr500 engine bore/piston specs needed

[busa4]

i need to do a top end rebuild on my cr500 motor. does anyone have standard bore cylinder diameter, piston diameter, upper connecting rod inner diameter, ring gap clearance, etc ,etc for this motor? i need to determine if i have to bore the cylinder. thanks for your help.

[Kane]

Stock bore is 89mm. The rest isn't needed to determine whether you need to bore or not. Replacememnt pistons go up by .25mm in Wiseco.

[busa4]

i measured my bore and i have an 89.072 with a 0.391mm piston to wall clearance. my ring gap was 0.029" or 0.7366mm

is it time to bore?

[Kane]

You need to measure at several points to ensure you arent out of round. Measure high, low, and at several points in the circumference. If you measured the ring gap from the used rings theres no way to get an accurate measurement as the rings are likely worn.

You could get by with a set of rings, but only if you're not out of round. If you're out of round, it's time to bore.

[busa4]

i have a dial bore gauge and i only received .0001" out of round at a couple points but never over 0.0001"

[Kane]

Dang, thats a solid cylinder. Deglaze and re-ring it.