Okay, here's how I got the numbers.

Bore: I took of the "pig tail" muffler and used a tiw wrap to measure across the top of the piston. Length was 1.2" better yet 1-1/8".

Stroke: I removed the plug and with the piston at TDC I measured .5 or 1/2". I turned the flywheel until the piston was at BDC and measured 1.5 or 1-1/2". The difference is 1". Then I used the formula and got 95cc (0k .942). Hope this was right. Let me know. Thanks.

*rcnats*