Couple of photos of 25cc water cooled, glow ignition, 4 cylinder that I finished about 12 months ago. Engine will live in 39inch hull of a Chris Craft Rivierra that I am also building. Fuel is methanol at about 5% castor and runs up above 10,000rpm no trouble.
Other casting is the start of 60cc V8. Will be run on unleaded. Plan for electronic spark ignition with advance retard, oil pump in sump, valley cam. Another is being built here with twin o'head cams.