75cc and 100cc racers - eccentric valve adjusters

[chris78jota]

Legend has it that to achieve the very high revs of the 75cc and 100cc racers - up to 11,100rpm from a pushrod single! - the factory swapped the standard rockers with locknut and screw tappets for very light, knife thin rockers with eccentric adjustment.

I contacted the Zanzani family, who were extremely generous and helpful, but sadly didn't they have any records from the era.

Does anyone in Laverdaland have any photos of them (or indeed ANY photos of the inside of the works race engines?)

Cheers
Chris

 

[Beucars]

That is correct. Try to get hold of Cesare Candida's 1967 Thesis. It shows all modifications to obtain 10,5 bhp @ 11,100 rpm from 75 cc. I'm interested as well.

Jeroen