...are you really sure about that?
Do you have 4-valve technique on the airhead?
Above 10.5:1 on an airhead is pushing it... and above 11:1 is adviced against by all sources I have have found...
It is -not- possible to run on poor petrol with that high compression ratio... you should seriously consider changing to stock 9.5:1 or even the 8.2:1 version to minimise overheating risks and allow for usage of low and poor octane petrol... there is a reason for why the Egypt Police ordered a special version of the R80 engines... 44/40 valves with Bing 40... equates about 7:1 allowing for EU 87 octane petrol to be used...
Let us know -exactly- how your engine have been modified. It is possible that my comments above may not apply - it depends on exactly how the conversion to 11.2:1 have been made.
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Drive Safely,
Albert
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