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Drilled and then recessed the rope starter to fit on the crankshaft, drill and tapped the end of the crank and surfaced ground a flat for the grub screw

Got some more work on the heads done Cleaned up the matting surface of the head Inlet and Exhaust ports drilled a tapped Turned down the stems so the valve rings fit over them The only thing left to do on the head is drill and tap the spark plug hole

HI I don't know anything about the science of spark plugs I am also in the process of building the Demon V8 and I have made the plugs for that, so I just scaled them up to the size I needed Michael

Worked on the head and got some of the holes drilled and the inlet and exhaust valve guides done I drilled small pilot holes for the inlet and exhaust valves, the transfers to the four jaw on the lathe I the drilled and reamed the valve guides, then drilled out for the ports and turned the valve...

Finished off the spark plug

Finished off the fixture for swaging the spark plugs Plug is just sitting in there has not been swaged yet

Welcome to the forum

Started to mack some new spark plugs and a fixture for swaging the parts together

I made Fixture to hold the head so all the holes could be drilled, this will allow me to hold the head in a vice and four jaw chuck The recess in the back is just for better access to the head when drilling reaming for the valves

Welcome to the forum

Welcome to the forum

I did see your engine Very well done, looks great

Hi Trevor I got the engine kit from a member in the states that was selling some of hi casting kits Looks like you can still get the kit from here 1945 Thompson Vertical Air Cooled Yes that is a HM50 retrofitted to cnc

Mounting for the fuel tank was milled flat and then drilled and tapped

Turned the dome on small cnc lathe and hex was on the cnc mill using the 4th axis

turned a short piece of aluminium to fit inside top and bottom of the fuel tank so the two holes would line up when drilled The holes in the bottom plate were taped and brass dome nuts for the top

Machine a grove in the bottom end of the fuel tank to take an Oring Also turning the inside of the top of the fuel tank and drilling the holes

Cleaning up and broaching the slot in the flywheel Mandrel was used to machine the second side of the flywheel

Pushrod for the exhaust valve, this engine doesn't have a pushrod for the inlet valve

scrap one plug :-( \ put that down as a practice one :)