Yesterday the box of bits came to light ... so I resumed.
The 'patina of heritage' ( rust) was cleaned off and a few other bits made, ie, the cylinder pivot and spring attachments.
Got to the point where I could part assemble it and turn it over. Woe was me. Stiff on the way up and the same on the way down. Bugger. Lots of faffing about looking for non-existent problems until I discovered that for once I'd made a piston that properly fitted the cylinder and it was compressing on the way up and vacuum pumping on the way down. Now I can be quite a bright kid (but only as a last resort) so I decided this was an opportune moment to poke the required hole in the cylinder. This being done I now have an engine that rotates happily.
#1.Bit more to do, sort out the crankpin and the 'big-end' which is not as cock-eyed as the pic. suggests but it is wrong. ( Largely due to some old geezer who can't be bothered to check if the chuck is properly centred on the R.T.
#2). Locate and drill the port holes. The bottom 3 bits don't look as if they belong there so will probably get removed.I should add this was to be made from bits in the 'odds 'n sods' box. No virgin materials were to be harmed during it's manufacture.
That's it for now. Time for my 'end of day lube' then snoozy time I think ..

Dave
Edit: 826M31 may be the spec.


.



runs great.

Got rid of him, just having a coffee and bikkies when..
engine. And off they went.
... then ...

maybe get some LMS Maroon
so here it is in alumin(i)um ( however you want it spelt )