Engine Trouble BT80 Piston Ring

[Zinger]

When I was putting my bt80 back together, I accidently snapped one of the piston ring while trying to put the head back on. Anyone know what size and where I can order one from? thanks

 

[Gordy]

I'm not entirely sure on the bore size. My BT80 was my first kit, so I just threw it together and bolted it up just to get riding. If I we're to build one again I'd measure everything and check clearances and what not. Do you have a caliper for measuring?