in response to what was posted earlier on...
a good tune on an aircooled will richen up when ET's get high. this is the only form of thermal management in the combustion chamber. there is a temp based enrichment that can be manipulated to fine tune these attributes in the EFI.
after years in vegas, and after i tuned the ECM, i never had an issue with temps. youd be surprised what a proper understanding of the tune and the engine will yield.