RE: Help identify this engine (and other questions)
Meow:
The cylinder looks a lot like the OK 60, but if it is it should have the 3/8-24 thread for the plug.
If you don't have thread gauges take the engine to your llocal hardware store that has a good selection of fasteners. By trying different SAE and metrics you should be able to find what the thread is.
Bill.
PS: See my post [link=http://www.rcuniverse.com/forum/m_3884973/anchors_3885157/mpage_1/key_/anchor/tm.htm#3885157]here[/link]. wr.