CC Tool Kit.
Check out this do it your self liquid CC tool kit. The easy way to check the cc volume in your combustion chamber.
Comes with 1x 85.5/ 87mm, 90.5/ 92mm and 94mm cc plates. 1x 60cc syringe and 1x syringe holder.
$29.99 for the complete kit.

How to use.
Its best to use wheel bearing grease. Apply to the outer edge of the bore seal plate that fits your bore.
Make sure you have your spark plugs installed! Fill the syringe with water and fill to the "0" mark then see how munch
your chamber will hold!  Try to work out all the extra air bubbles.