Ive got .030-.040 for the h35 and .060-.070 for the hs40 in my book (1972 edition of "minibike service manual")
Thank you for that information. I am using an "online" version of a 1998 Tec manual that outlines several models. Towards the end of the book, it lists HS40 at .035, with the H35 (1982 and prior) at .065.
No year MFG differences are stated for the HS40.
Note, my HS40 is model 55232A Serial Number 3276. It is stamped onto a plate that is riveted on the shroud in the usual place. I can only guess if it was an 83 or 93 engine. Doubt it was a 73, since the shroud looks like the 80's engine sitting next to it.
Scratching my head on this one.
Symptoms were bad carb, so I rebuilt. (It WAS clogged) At the same time, I replaced points, condensor and plug. Checked magnets, then adjusted for TDC with the dial gauge. Plug gets wet, good, strong spark, bit of kickback, and now a partially sheared key. That's why I assumed I timed it wrong.