[MENTION=5969]markus[/MENTION] thank you for that information. I have book marked several of your posts here with information like that. I am trying to put together a pre-1981 HS40, using a 33080 crank and some hotrod goodies. I am not trying to build a vintage Rupp engine. Having no luck with Ebay, and as you might imagine, there isn't a snow blower within hundreds of miles of me, much less one with a vintage HS40 on it.
Oh and just to show what a jack ass I am, last month I went to the dump and tossed the Tecumseh flywheel and cup I had that fit a 1974 standard crank. It looked a lot like that skinny one you have that says "HS 40" on it. Makes me a bit ill even typing this.
Thanks again for sharing your wealth of information on these Markus.