You must now that on french production race 750cc class, then 1000cc class, then 1300cc class, from 1972 to 1978 included, the championship was winning by H2, last victory of H2 was on 1979, the late Joël PARE at Paul Ricard track who sadly died of illness some years after. On 1979, rules change, the bikes could have all internal they want just carbs and exhausts stock (before was standart bikes) to help Honda 900 Bol d'or to win.
During those years, H2S fought against CB 750 on 72, the poor four never saw the light, then Z1 which never saw the light too, some Norton 750, then Ducati 900ss which won some races but never the championship, Laverda 1000cc same than Ducati, GUZZI 850 LM which won one race (factory bike with non standart engine exhaust, Le Mans track 1978? but we said nothing as we rode with av-gas which was also illegal and the second -the great Rosseto ANGELINIADIS who sadly became tetraplegic after a crash on race bike 10 years later- was on H2 as the others and was beaten by half a second on the chequered flag).
But in Le MANS 6 hours endurance race 1979, we were second overall on trial, first was Dominique SARRON with official french HONDA 900 Bol d'or with the whole racing kit excepted carbs and exhausts and the 3d, 4th and 5th were French Honda official bikes: race was an other story
Our H2 was just xtrem porting with a round crankshaft made by my race partner Laurent V (genuine H2 crankshaft with alloy inserts bolt and glue on the original crank). the engine was strong and tractable from 1500 RPM to 8500 RPM
best H2 engine I never drive
The year after, the track drawing changes and became longer so it's the best lap for ever done by an H2 production on Le Mans
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which command the long straight after