To the 175, the engine of Disco Volante and Sport are just the same. The first one has this special gas tank and was buildt 55 to 56 and the later one was fittet with another tank and different front fork.
Check the cylinder Head and the four long screws which fix the cylinder barrel and the head. The diamiter has to be 10 mm.
i understand Alexander.. we hunt the same parts then,,,Smile,
i want to find a modello sport or disco or squalo head,, i will weld on a cst head to get a larger intake
and use that until i find a sport head. i had an idea of milling out heads to but will see what it all
have you any knowledge of what conrod that is possible to use on these 175 engines.? a modern one.
kind regards Åke