Tee Dee .010 powered tether-cars

I also had the same observation as George, that, without a heat sink on the cylinder , and with the fins in an inclined cylinder position, plus the bent copper plate shading the cylinder fins from fresh air blast,  the cooling of the engine may be sub-optimal..also, the backplate used seems to be a flat sheet metal as opposed to the stock COX backplate that occupies part of the crank-case volume (unless the 5th bolt in the center of backplate screws holds such a dummy bulge  in place inside the crankcase). With a flat backplate only, I would assume that the crankcase compression ratio is reduced as is the fuel-air charge shot from the case to the cylinder, and thus the engine output is lower?

Sorry for nit-picking!

But overall, this is a beautiful tiny toy and I wish I had one to test it (and improve its crankcase compression by reinstalling the true COX backplate with some adapter, as well as the engine cooling   ).

That is Cool like wise would love to see one run , Thanks roddie

You can see there is also a another plate on the CC where it mounts see the split ?>