Off topic I was speaking with the owner of my local hobby shop and he got some spar glow plugs in for that new 15cc OS engine that runs on gasoline but runs on a glow plug without an ignition setup. He took one of them and stuck it in on old Weber .61 and she ran great even the idle perfect. The only difference he noticed was a little lower RPM at full throttle, he loss about 200 RPM. He plans on trying it with a 4 cycle engine tomorrow. I may just try converting a few engines myself. He used a 40-1 ratio on the fuel but his feeling is he would want to increase to 20-1 for engines without bearings.
Mike