I'm doing a hop up of an HS40 at the moment and I wanted to report my findings on billet connecting rods for these engines. Nowadays, nobody sells new billet connecting rods designed for the HS40, along with its under bored and over bored siblings, the H35 and HS50. ARC racing does sell a billet connecting rod, part number ARC6282, for the Tecumseh 5.5 HP OHV, which I believe is the OHH55. I was looking at the specs for the HS40 in the service manual and I noticed the stroke and crank pin journal diameter were the same for the HS40 and the OHH55! So I decided it was worth a shot, ordered the ARC rod, and lo and behold, it fits perfectly! I suspect it will likewise fit the H35 and HS50 engines. I have included photos of the original HS40 rod and the new ARC rod.
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