Some place around here, I have drawings of the liquid cooled stuff I am still intending to build for an H2. They've been done for decades, no time to get it done. The cylinders would be an all 3 in one casting, and started as intake port reeds, then changed to rear transfer ports for case reeds, adding power valves to the exhaust ports, bridged exhausts. The transfer port openings on the base were siamese'd together, so there could be a larger volume through the transfer openings, and a bigger base gasket foot print. This would allow the cases to be welded up between the transfer ports, to match the larger transfer openings, and for the case reed setup, rear case cutaway's to feed the rear boosters.
Head casting was also single water jacket casting for all 3 heads, with removable head inserts that could be modified on a lathe.
Kinda, sorta like a basic KR750, but done for an H2 case set, no splayed port layout. I am sure it would have led to a different set of case castings, ones that already had the case reeds, and 6 or 7 speed transmission area, larger clutch, wet or dry, and other "improvements".
Maybe when I retire, I can get back to them, and get it done.
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