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On their first 950cc engine Japauto used an OEM block with rebored cylinder block.
That was enough to win the Bol d'Or in 1972 and 1974 but was a little too "crude" for road use.
So in 1974 they started working on a carefully rebored engine block and a new cylinder block casting made by JPX with special pistons by Bretille (see second photo)
The engine became both powerful ( 85 / 100hp depending on the exhaust and carbs) & reliable.
On this photo you can see the original Honda CB cylinder block ( center) the first 950 SS cylinder block ( left) and the 1000 VX cylinder block (right) as well as the three corresponding pistons.
The engine look is very different with the JPX block
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