Ok Guys, here is what I found......there is a '10' stamped on one of the lower mounting flange on the jug. Does this mean it is 10cc? I find that hard to believe, since the piston is easily three times as big as any .40 size glow engine. I visited the C-H website, but I am still a little fuzzy on the spark issue. How do these engines maintain spark? I thought a magneto was something driven off of a crankshaft, there doesn't seem to be anything driven off the crank on this little Mac. There is a 'flywheel' with what appear to be magnets embedded in it, and a pickup of some sort suspended above it. How does this all work?

By the way, this Mac of mine has a Champion #DJ8J plug in it, if this helps. Thanks for everyone's help, truly a great forum!

Tommy