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Anyone know of a rule of thumb for calculating valve spring size/spring rate for a small gas engine? Any advice on selecting or sourcing springs?

I’ve bored my 2” cylinder and honed it to the point where it doesn’t seem to be getting any smoother. It is very smooth to the fingertip, but I can see rather coarse looking hone markings, that can barely be felt with a fingernail, I was using a 220 grit, 2-7” hone. I am thinking bore needs to...

Hello, After looking at some of the amazing engines built by members here , I decided this might be a good place to hang out and maybe get some help with the rather crude engine I’m building. I’m using a beat-up 9” South Bend lathe, drill press, grinders and hand tools. I did work as a...