Hi Kye

These are great for the record. And illustrated too!
The C80 was the fan assisted cooling version of the older 80.

These are robust engines that were popular on mainly British makes.
However, the Grasshopper used them here as well:-

https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=51420

Note the primitive fan on top of the pulley on this early Grasshopper.
The engine is the Model 80. I don't think the fan did much...

[Linked Image]

Cheers
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Jack