That is the spot for a core plug. it would make sense if they wanted to add a drain. If it is being used for a compression release – I suppose you can use it for that, but I’d be concerned with it leaking – or worse.
I’d plug it myself, but you’d have to be sure the end of the plug doesn’t extend into the combustion chamber where it can get hit.
They weren’t sold with a compression release originally. THey were meant to be bump started with the knob. You can rope it, but you need the right technique. its not a lot different than any other engine with strong compression.
PM T2
Definitely, the petcock was screwed into the combustion chamber, and
the threads protruded into the cylinder 1/8" plus, evidently past
the piston travel. 😯
I’ll put a pipe plug in the threaded hole in the combustion chamber.
Not sure what I should use on the threads.
Perma Lock, JB Weld ?
Photo is hole in core plug where petcock was screwed into the combustion chamber.
I have socks stuffed inside the cylinder, getting ready for sand blasting, and that’s
what you see in the ports and in the "home made" compression relief hole.
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