The carbs were rebuilt by WEBER JETS in Vancouver Canada. EXPENSIVE. But the 2977 Esprit S1 runs like a ROLEX PRESIDENT.
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That Weber spec is interesting to say the least. The original Twincam at 1500cc and 95-100 HP was so equipped, wouldn't think that to be optimal for output on the 907 but it would run like a Swiss watch if the carbs are in good shape.
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Cheers